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Encyclopedia > Transversus abdominis muscle
Transversus abdominis muscle
Muscles of the trunk.
The Transversus abdominis, Rectus abdominis, and Pyramidalis.
Latin musculus transversus abdominis
Gray's subject #118 414
Origin: from the ribs and the iliac crest
Insertion: inserts into the pubic tubercle via the conjoint tendon, also known as the falx inguinalis
Artery:
Nerve:
Action:
Dorlands/Elsevier m_22/12551205

The transversus abdominis muscle, also known as the transversalis muscle and transverse abdominal muscle, is a muscle layer of the anterior and lateral abdominal wall which is just deep to (layered below) the internal oblique muscle. Image File history File links Illu_trunk_muscles. ... Image File history File links Download high resolution version (462x700, 108 KB) Summary Licensing File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Wikipedia:Grays Anatomy images with missing articles 8 Transversus abdominis muscle Pyramidalis muscle List of... The transversus abdominis muscle, also known as the transverse abdominal muscle, is a muscle layer of the anterior and lateral abdominal wall which is near to the internal oblique muscle. ... Rectus abdominis The rectus abdominis muscle is a paired muscle running vertically on each side of the anterior wall of the human abdomen (and in some animals). ... The pyramidalis is a muscle that is considered insignificant in humans. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... A typical adult human skeleton consists of the following 206 bones, though a small portion of the human population have an extra bone, occurring in the form of an extra rib. ... This article is about the bones called ribs. ... Human male pelvis, viewed from front Human female pelvis, viewed from front The pelvis is the bony structure located at the base of the spine (properly known as the caudal end). ... A typical adult human skeleton consists of the following 206 bones, though a small portion of the human population have an extra bone, occurring in the form of an extra rib. ... A man and a woman in the Pioneer plaque. ... The conjoint tendon is a structure formed from the conjoined tendons of the internal oblique and transversus abdominis muscles. ... Section of an artery For other uses see Artery (disambiguation) Arteries are muscular blood vessels that carry blood away from the heart. ... List of human nerves External links List of nerves This is an incomplete list, which may never be able to satisfy certain standards for completeness. ... Elseviers logo Elsevier, the worlds largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. ... The abdomen (from the Latin word meaning belly) is the part of the body between the pelvis and the thorax. ... The internal oblique (or Obliquus internus abdominis) is the intermediate muscle of the abdomen, lying just underneath the external oblique and just above (superficial to) the transverse abdominal muscle. ...

Contents

Structure

The transversus abdominis, so called for the direction of its fibers, is the innermost of the flat muscles of the abdomen, being placed immediately beneath the internal oblique muscle. The internal oblique (or Obliquus internus abdominis) is the intermediate muscle of the abdomen, lying just underneath the external oblique and just above (superficial to) the transverse abdominal muscle. ...


Origin

It arises, as fleshy fibers, from the lateral third of the inguinal ligament, from the anterior three-fourths of the inner lip of the iliac crest, from the inner surfaces of the cartilages of the lower six ribs, interdigitating with the diaphragm, and from the lumbodorsal fascia. The inguinal ligament is a band running from the pubic tubercle to the anterior superior iliac spine. ... In the anatomy of mammals, the diaphragm is a shelf of muscle extending across the bottom of the ribcage. ...


Insertion

The muscle ends in front in a broad aponeurosis, the lower fibers of which curve downward and medialward, and are inserted, together with those of the internal oblique muscle, into the crest of the pubis and pectineal line, forming the inguinal aponeurotic falx. In layperson's terminology, the muscle ends in the middle line of a person's abdomen. The internal oblique (or Obliquus internus abdominis) is the intermediate muscle of the abdomen, lying just underneath the external oblique and just above (superficial to) the transverse abdominal muscle. ... A man and a woman in the Pioneer plaque. ... On the posterior surface of the femur, the intermediate ridge or pectineal line is continued to the base of the lesser trochanter and gives attachment to the Pectineus. ... The conjoint tendon is a structure formed from the conjoined tendons of the internal oblique and transversus abdominis muscles. ...


Throughout the rest of its extent the aponeurosis passes horizontally to the middle line, and is inserted into the linea alba; its upper three-fourths lie behind the rectus muscle and blend with the posterior lamella of the aponeurosis of the internal oblique; its lower fourth is in front of the rectus abdominis. Rectus abdominis The rectus abdominis muscle is a paired muscle running vertically on each side of the anterior wall of the human abdomen (and in some animals). ...


Layperson's description

  • The transvers abs run from our sides (lateral) to the front (medial), its fibers running horizontally (transverse).
  • The lateral beginnings of the muscle (origin) run from the front of the inside part of the hip bone[1] (anterior iliac crest and inguinal ligament) to the last rib of the rib cage. It also is connected to the diaphragm which helps with inhalation.
  • The muscle runs transverse and is the deepest of the major abdominal muscles (the others being the rectus abdominus, and the internal and external obliques).
  • It ends (the muscle insertion) by joining with the large vertical abdominal muscle in the middle (the linea alba), where the fibers begin to curve downward and upward depending on what direction it has to go to meet the linea alba, and below the sternum it combines with next most superficial muscle (the internal oblique). This insertion runs down by the belly button where it passes over the thick abdomen muscle (the "6/8-pack") and all the ab muscle fibers join together.

Human male pelvis, viewed from front Human female pelvis, viewed from front The pelvis is the bony structure located at the base of the spine (properly known as the caudal end). ... The inguinal ligament is a band running from the pubic tubercle to the anterior superior iliac spine. ... In the anatomy of mammals, the diaphragm is a shelf of muscle extending across the bottom of the ribcage. ...

Innervation

The transversus abdominis is innervated by the lower intercostal nerves, as well as the iliohypogastric nerve and the ilioinguinal nerve. The Iliohypogastric Nerve arises from the first lumbar nerve. ... The Ilioinguinal Nerve, smaller than the Iliohypogastric nerve, arises with it from the first lumbar nerve. ...


Actions

The transversus abdominus (TVA) helps to compress the ribs and gut, providing thoracic and pelvic stability. See the wikipedia entry for Core (anatomy)#Functions of the core. The core refers, in its most general of definitions, to the body minus the legs and arms [1]. Functional movements are highly dependent on the core, and lack of core development can result in a preponderance to injury[citation needed]. The major muscles of the core reside in the area...


Variations

It may be more or less fused with the Obliquus internus or absent. The spermatic cord may pierce its lower border. Slender muscle slips from the ileopectineal line to transversalis fascia, the aponeurosis of the Transversus abdominis or the outer end of the linea semicircularis and other slender slips are occasionally found. The transversalis fascia is a thin aponeurotic membrane which lies between the inner surface of the Transversus and the extraperitoneal fat. ... The linea semicircularis (or arcuate line or line of Douglas) is a border of the rectus abdominis muscle. ...


The muscle in movement and training

The most well known and effective method of strengthening it is the vacuum exercise, as well as engaging it during lifts. The transversus is the body's natural weight-lifting belt, stabilizing the spine and pelvis during lifting movements. Failure to engage the muscle at higher intensity lifts is dangerous and encourages injury. It acts as a girdle or corset in creating hoop tension around the midsection, tensing before contraction of the extremities. The vacuum exercise is an exercise which involves contracting some internal abdominal muscles (primarily the Transversus abdominis muscle), and not as much the diaphragm, the six pack muscles or abs which are trained through crunches or leg raises. ...


Without a stable spine, the nervous system fails to recruit the muscles in extremities efficiently, and functional movements cannot be properly performed.[citation needed] Stabilization must then occur at the segmental level. The transversus abdominis and the segmental stabilizers of the spine are designed to work in tandem. This kind of lifting eventually overloads segmental stabilizers, and can result in massive lower back pain, early degeneration and many orthopedic problems. Functional movements are movements based on real-world situational biomechanics. ... In anatomy and physiology, segmental stabilizers are the muscles which provide support across joints, as in the multifidus across spinal vertebrae. ... Orthopedic surgery or orthopedics (BE: orthopaedics) is the branch of surgery concerned with acute, chronic, traumatic and recurrent injuries and other disorders of the locomotor system, its musclular and bone parts. ...


Additional images

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant. GPnotebook is a British medical database for general practitioners (GPs. ... A garden sign welcomes residents and visitors to Rogers Park as home of Loyola University Chicago. ... The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind in the Borough of Brooklyn in New York City. ... The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind in the Borough of Brooklyn in New York City. ... The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind in the Borough of Brooklyn in New York City. ... The State University of New York, abbreviated SUNY (IPA pronunciation: ) is a system of public institutions of higher education in New York, United States. ... The State University of New York, abbreviated SUNY (IPA pronunciation: ) is a system of public institutions of higher education in New York, United States. ... The State University of New York, abbreviated SUNY (IPA pronunciation: ) is a system of public institutions of higher education in New York, United States. ... The State University of New York, abbreviated SUNY (IPA pronunciation: ) is a system of public institutions of higher education in New York, United States. ... The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...

Muscles of the Head — Neck — Trunk — Upper limb — Lower limb— LIST OF ALL MUSCLES

BACK: splenius: (capitis | cervicis) | erector spinae (iliocostalis | longissimus | spinalis) | latissimus dorsi|
transversospinales: (semispinalis dorsi | semispinalis cervicis | semispinalis capitis | multifidus | rotatores) | interspinales | intertransversarii | (Gray's s115) It has been suggested that this article or section be merged into Muscular system. ... This is a list of muscles of the human anatomy. ... The human back is the large posterior area of the human body, rising from the top of the buttocks to the back of the neck and the shoulders. ... The Splenius capitis muscle is a muscle of the human body. ... The xxxxx is a muscle of the human body. ... The Erector spinae (or Sacrospinalis in older texts), and its prolongations in the thoracic and cervical regions, lie in the groove on the side of the vertebral column. ... The iliocostalis is the muscle immediately lateral to the longissimus that is the nearest to the furrow that separates the epaxial muscles from the hypaxial. ... The longissimus is the muscle lateral to the semispinalis. ... The spinalis is the portion of the erector spinae located nearest to the spine. ... Latissimus dorsi is a large flat muscle located on the back. ... The transversospinales muscles are a group of muscles of the human back. ... The Semispinalis dorsi (or semispinalis thoracis) consists of thin, narrow, fleshy fasciculi, interposed between tendons of considerable length. ... The semispinalis cervicis (semispinalis colli), thicker than the semispinalis dorsi, arises by a series of tendinous and fleshy fibers from the transverse processes of the upper five or six thoracic vertebræ, and is inserted into the cervical spinous processes, from the axis to the fifth inclusive. ... The Semispinalis capitis (Complexus) is situated at the upper and back part of the neck, beneath the Splenius, and medial to the Longissimus cervicis and capitis. ... The Multifidus muscle is a muscle of the human body. ... The Rotatores muscle is a muscle of the human body. ... these muscles sometimes hurt me. ... Intertransversarii muscles The Intertransversarii are small muscles placed between the transverse processes of the vertebræ. In the cervical region they are best developed, consisting of rounded muscular and tendinous fasciculi, and are placed in pairs, passing between the anterior and the posterior tubercles respectively of the transverse processes of two... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


SUBOCCIPITAL: rectus capitis posterior (major, minor) | obliquus capitis (inferior, superior) | (Gray's s116) The first spinal nerve, the suboccipital nerve exits the spinal cord between the skull and the first cervical vertebra, the atlas. ... The Rectus capitis posterior major muscle is a muscle of the human body. ... The Rectus capitis posterior minor muscle is a muscle of the human body. ... In anatomy, the obliquus capitis inferior muscle, the larger of the two oblique muscles, is one of the muscles of the neck. ... It arises from the lateral mass of the atlas bone. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


CHEST: intercostales (external, internal, innermost) | subcostales | transversus thoracis | levatores costarum | serratus posterior (inferior, superior) | diaphragm | (Gray's s117) Chest of a human male The chest is a part of the anatomy of humans and various other animals. ... Intercostal muscles are several groups of muscles that run between the ribs, and help form and move the chest wall. ... The Intercostales externi (External intercostals) are eleven in number on either side. ... The Intercostales interni (Internal intercostals) are eleven in number on either side. ... The Innermost intercostal muscle is a layer of intercostal muscle beneath the intercostal nerves and internal intercostal muscles. ... The Subcostales muscle is a muscle of the human body. ... The tranversus thoracis lies internal to the thoracic cage, anteriorly. ... The Levatores costarum, twelve in number on either side, are small tendinous and fleshy bundles, which arise from the ends of the transverse processes of the seventh cervical and upper eleven thoracic vertebrae; they pass obliquely downward and lateralward, like the fibers of the Intercostales externi, and each is inserted... The Serratus posterior inferior muscle is a muscle of the human body. ... The Serratus posterior superior muscle is a muscle of the human body. ... In the anatomy of mammals, the diaphragm is a shelf of muscle extending across the bottom of the ribcage. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


ABDOMEN: obliques (external, internal) | transversus abdominis | rectus abdominis | pyramidalis | cremaster | quadratus lumborum | (Gray's s118) The human abdomen (from the Latin word meaning belly) is the part of the body between the pelvis and the thorax. ... The Obliquus externus abdominis muscle (or external oblique) is a muscle of the human body. ... The internal oblique is the intermediate muscle of the abdomen, lying just underneath the external oblique and just above (superficial to) the transverse abdominal muscle. ... The rectus abdominis muscle is a paired muscle running vertically on each side of the anterior wall of the human abdomen (and in some animals). ... The pyramidalis is a muscle that is considered insignificant in humans. ... The cremaster muscle is a muscle that covers the testis. ... The Quadratus lumborum muscle is a muscle of the human body. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


PELVIS: levator ani (iliococcygeus, pubococcygeus, puborectalis) | coccygeus | (Gray's s119) The pelvis (pl. ... The Levator ani is a broad, thin muscle, situated on the side of the pelvis. ... The Iliococcygeus arises from the ischial spine and from the posterior part of the tendinous arch of the pelvic fascia, and is attached to the coccyx and anococcygeal raphé; it is usually thin, and may fail entirely, or be largely replaced by fibrous tissue. ... The pubococcygeus muscle or PC muscle is an important muscle in the human body. ... The fibers which form a sling for the rectum are named the Puborectalis or Sphincter recti. ... The Coccygeus is situated behind the levator ani. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


PERINEUM: sphincter ani (externus, internus) | superficial perineal pouch (transversus perinei superficialis | bulbospongiosus | ischiocavernosus) | deep perineal pouch (transversus perinei profundus, sphincter urethrae membranaceae) | (Gray's s120) The muscles of the male perineum In human anatomy, the perineum is generally defined as the surface region in both males and females between the pubic symphysis and the coccyx. ... The Sphincter ani externus muscle is a muscle of the human body. ... The Sphincter ani internus muscle is a muscle of the human body. ... The superficial perineal pouch (also superficial perineal compartment/space/sac) is a compartment of the perineum. ... The Transversus perinei superficialis muscle is a muscle of the human body. ... Bulbospongiosus is one of the superficial muscles of the perineum. ... The ischiocavernosus muscle is a muscle just below the surface of the perineum, present in both men and women. ... The deep perineal pouch (also deep perineal space, or in Latin, saccus profundus perinei) is an anatomical term that refers to the partially enclosed space in the perineum, located superiorly to the perineal membrane. ... The Transversus perinei profundus muscle is a muscle of the human body. ... The Sphincter urethrae membranaceae muscle is a muscle of the human body. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


  Results from FactBites:
 
Transversus abdominis muscle - Wikipedia, the free encyclopedia (616 words)
It arises, by fleshy fibers, from the lateral third of the inguinal ligament, from the anterior three-fourths of the inner lip of the iliac crest, from the inner surfaces of the cartilages of the lower six ribs, interdigitating with the diaphragm, and from the lumbodorsal fascia.
The muscle ends in front in a broad aponeurosis, the lower fibers of which curve downward and medialward, and are inserted, together with those of the internal oblique muscle, into the crest of the pubis and pectineal line, forming the inguinal aponeurotic falx.
Throughout the rest of its extent the aponeurosis passes horizontally to the middle line, and is inserted into the linea alba; its upper three-fourths lie behind the rectus muscle and blend with the posterior lamella of the aponeurosis of the internal oblique; its lower fourth is in front of the rectus abdominis.
eMedicine - Abdominal Hernias : Article by Eustace S Golladay, MD (10905 words)
Deep to the external oblique muscle is the internal oblique muscle with obliquely and superiorly oriented fascicles arising from the iliac fascia deep to the lateral half of the inguinal ligament, from the anterior two thirds of the iliac crest, and from the lumbodorsal fascia.
The superior lumbar triangle of Grynfeltt-Lesshaft is bounded superiorly by the 12th rib, the posterior lumbocostal ligament, and the serratus posterior inferior muscle; inferiorly by the superior border of the internal oblique muscle; and posteriorly by the lateral border of the sacrospinalis muscle.
The muscle fascicles exit the pelvis at the lesser sciatic foramen and have a tendinous insertion on the medial surface of the greater trochanter of the femur.
  More results at FactBites »

 
 

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