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Encyclopedia > Sternocleidomastoid muscle
Sternocleidomastoid
The triangles of the neck. (Anterior triangles to the left; posterior triangles to the right.)
Muscles of the neck. Lateral view.
Latin m. sternocleidomastoideus
Gray's subject #111 390
Origin: manubrium sterni, clavicle
Insertion: mastoid process, superior nuchal line
Blood: occipital artery and the superior thyroid artery
Nerve: motor: accessory nerve
sensory: cervical plexus
Action:
Antagonist: {{{Antagonist}}}
MeSH {{{MeshNumber}}}
Dorlands/Elsevier {{{DorlandsPre}}}/{{{DorlandsSuf}}}

In human anatomy, the sternocleidomastoid (pronounced /ˌstɚ.noˌkli.dəˈmæs.tɔɪ̯d/) muscles are muscles in the neck that act to flex and rotate the head. Image File history File links Gray512. ... Anatomists use the term triangles of the neck to describe the divisions created by the major muscles in the region. ... Image File history File links Gray385. ... It has been suggested that History of the Latin language be merged into this article or section. ... 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. ... The manubrium (or manubrium sterni) is the broad, upper part of the sternum. ... Left clavicle - from above Left clavicle - from below Collarbone (a bone) redirects here. ... 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. ... The mastoid process (or mastoid bone) is a conical bump of the posterior portion of the temporal bone that is situated behind the ear in humans and many other vertebrates and serves as a site of neck muscle attachment (the Sternocleidomastoid, Splenius capitis, and Longissimus capitis). ... The nuchal lines are four curved lines on the external surface of the occipital bone: The upper, often faintly marked, is named the highest nuchal line, and to it the galea aponeurotica is attached. ... occipital artery ... The superior thyroid artery arises from the external carotid artery just below the level of the greater cornu of the hyoid bone and ends in the thyroid gland. ... 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. ... The accessory nerve is the eleventh of twelve cranial nerves. ... The cervical plexus is a plexus of the ventral roots of the first four cervical spinal nerves which are located from C1 to C4 cervical segment near the neck. ... An antagonist is a kind of muscle that act in opposition to the movement generated by the agonists and are responsible for returning a limb to its initial position. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Elseviers logo Elsevier, the worlds largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. ... Anatomical drawing of the human muscles from the Encyclopédie. ...


It is given the name sternocleidomastoid because it attaches to the sternum (sterno-), the clavicle (cleido-), and the mastoid process of the temporal bone of the skull. It is also called the sternomastoid muscle. Figure 1 : Anterior surface of sternum and costa cartilages. ... Left clavicle - from above Left clavicle - from below Collarbone (a bone) redirects here. ... The mastoid process (or mastoid bone) is a conical bump of the posterior portion of the temporal bone that is situated behind the ear in humans and many other vertebrates and serves as a site of neck muscle attachment (the Sternocleidomastoid, Splenius capitis, and Longissimus capitis). ... The temporal bones (os temporales) are situated at the sides and base of the skull. ... A hippopotamus skull A skull, or cranium, is a bony structure of Craniates which serves as the general framework for a head. ...


It also acts as an accessory muscle of inspiration, along with the scalene muscles of the neck. The scalene muscles are a group of three pairs of muscles in the lateral neck, namely the anterior scalene, middle scalene, and posterior scalene. ...

Contents


Origins and insertions of the two heads

The Sternocleidomastoideus (Sternomastoid muscle) passes obliquely across the side of the neck.


It is thick and narrow at its central part, but broader and thinner at either end. It arises from the sternum and clavicle by two heads. Figure 1 : Anterior surface of sternum and costa cartilages. ... Left clavicle - from above Left clavicle - from below Collarbone (a bone) redirects here. ...

  • The medial or sternal head is a rounded fasciculus, tendinous in front, fleshy behind, which arises from the upper part of the anterior surface of the manubrium sterni, and is directed upward, lateralward, and backward.
  • The lateral or clavicular head, composed of fleshy and aponeurotic fibers, arises from the superior border and anterior surface of the medial third of the clavicle; it is directed almost vertically upward.

The two heads are separated from one another at their origins by a triangular interval, but gradually blend, below the middle of the neck, into a thick, rounded muscle which is inserted, by a strong tendon, into the lateral surface of the mastoid process, from its apex to its superior border, and by a thin aponeurosis into the lateral half of the superior nuchal line of the occipital bone. Fasciculus can refer to: Arcuate fasciculus Dorsal longitudinal fasciculus Medial longitudinal fasciculus Flechsigs fasciculus Fasciculus Chemicus A structure in the Wrist#Volar_radiocarpal_ligament Category: ... The manubrium (or manubrium sterni) is the broad, upper part of the sternum. ... Aponeuroses (απο, away, and νευρον, a sinew) are membranes separating muscles from each other. ... Left clavicle - from above Left clavicle - from below Collarbone (a bone) redirects here. ... The mastoid process (or mastoid bone) is a conical bump of the posterior portion of the temporal bone that is situated behind the ear in humans and many other vertebrates and serves as a site of neck muscle attachment (the Sternocleidomastoid, Splenius capitis, and Longissimus capitis). ... Aponeurosis is the singular of Aponeuroses Grays Anatomy states that Aponeuroses are flattened or ribbon-shaped tendons, of a pearly white color, iridescent, glistening, and similar in structure to the tendons. ... The nuchal lines are four curved lines on the external surface of the occipital bone: The upper, often faintly marked, is named the highest nuchal line, and to it the galea aponeurotica is attached. ... The occipital bone [Fig. ...


Variations

The Sternocleidomastoideus varies much in the extent of its origin from the clavicle: in some cases the clavicular head may be as narrow as the sternal; in others it may be as much as 7.5 cm. in breadth.


When the clavicular origin is broad, it is occasionally subdivided into several slips, separated by narrow intervals.


More rarely, the adjoining margins of the Sternocleidomastoideus and Trapezius have been found in contact. Trapezius In human anatomy, the trapezius is a large superficial muscle on a persons back. ...


The Supraclavicularis muscle arises from the manubrium behind the Sternocleidomastoideus and passes behind the Sternocleidomastoideus to the upper surface of the clavicle.


Cultural significance

To meet Wikipedias quality standards, this article or section may require cleanup. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... A lawyer is a person qualified to give legal advice who advises clients in legal matters and represents them in courts of law and in other forms of dispute resolution. ...

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.
This article or section contains information that has not been verified and thus might not be reliable. ... GPnotebook is a British medical database for general practitioners (GPs. ... SUNY Downstate Medical Center is Brooklyns only academic medical center. ... 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
SUPERFICIAL CERVICAL: platysma | (Gray's s110)

LATERAL CERVICAL: sternocleidomastoid | (Gray's s111) A top-down view of skeletal muscle Muscle is the contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. ... This is a list of muscles of the human anatomy. ... The platysma is a superficial muscle that stretches from the clavicle to the mandible overlapping the sternocleidomastoid. ... 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. ... 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. ...


SUPRAHYOID: digastric | stylohyoid | mylohyoid | geniohyoid - INFRAHYOID: sternohyoid | sternothyroid | thyrohyoid | omohyoid | (Gray's s112) The term suprahyoid refers to the region above (superior) to the hyoid bone in the neck. ... The digastric muscle (named digastric as it has two bellies) is a small muscle located under the jaw. ... The Stylohyoid muscle is a slender muscle, lying in front of, and above the posterior belly of the digastric muscle. ... The Mylohyoid muscle, flat and triangular, is situated immediately above the anterior belly of the Digastricus, and forms, with its fellow of the opposite side, a muscular floor for the cavity of the mouth. ... The Geniohyoideus (Geniohyoid muscle) is a narrow muscle, situated above the medial border of the Mylohyoideus. ... The term infrahyoid refers to the region below(inferior) to the hyoid bone in the neck. ... The Sternohyoid muscle is a muscle of the human body. ... The Sternothyroid muscle is a muscle of the human body. ... The Thyrohyoid muscle is a muscle of the human body. ... The omohyoid muscle is a muscle at the front of the neck that consists of two bellies separated by an intermediate tendon. ... 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. ...


VERTEBRAL -- ANTERIOR: longus colli | longus capitis | rectus capitis anterior | rectus capitis lateralis (Gray's s113) The Longus colli muscle is a muscle of the human body. ... The Longus capitis muscle is a muscle of the human body. ... Wikipedia does not have an article with this exact name. ... The Rectus capitis lateralis 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. ...


LATERAL: scalenus anterior | scalenus medius | scalenus posterior | (Gray's s114) The scalene muscles are a group of three pairs of muscles in the lateral neck, namely the anterior scalene, middle scalene, and posterior scalene. ... The scalene muscles are a group of three pairs of muscles in the lateral neck, namely the anterior scalene, middle scalene, and posterior scalene. ... The scalene muscles are a group of three pairs of muscles in the lateral neck, namely the anterior scalene, middle scalene, and posterior scalene. ... 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:
 
Sternocleidomastoid muscle - Wikipedia, the free encyclopedia (398 words)
In human anatomy, the sternocleidomastoid (pronounced /ˌstɚ.noˌkli.dəˈmæs.tɔɪ̯d/) muscles are muscles in the neck that act to flex and rotate the head.
It is given the name sternocleidomastoid because it attaches to the sternum (sterno-), the clavicle (cleido-), and the mastoid process of the temporal bone of the skull.
The Supraclavicularis muscle arises from the manubrium behind the Sternocleidomastoideus and passes behind the Sternocleidomastoideus to the upper surface of the clavicle.
  More results at FactBites »

 
 

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