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Encyclopedia > Ventral ramus
Nerve: Ventral ramus
The formation of the spinal nerve from the dorsal and ventral roots. (Ventral ramus labeled at lower left.)
Latin ramus anterior nervi spinalis
Gray's subject #210 925

The ventral ramus (anterior ramus, anterior divisions of the spinal nerves) supply the antero-lateral parts of the trunk, and the limbs; they are for the most part larger than the posterior divisions. Image File history File links Spinalnerve. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ...

In the thoracic region they run independently of one another, but in the cervical, lumbar, and sacral regions they unite near their origins to form plexuses. Diagram of a tsetse fly, showing the head, thorax and abdomen The thorax is a division of an animals body, that lies between the head and the abdomen. ... In anatomy, cervical is an adjective that has two meanings: of or pertaining to the neck. ... In anatomy, lumbar is an adjective that means of or pertaining to the abdominal segment of the torso, between the diaphragm and the sacrum (pelvis). ... Sacrum, pelvic surface The sacrum (os sacrum) is a large, triangular bone at the base of the vertebral column and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones. ...

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 As such, some of the information contained herein may be outdated.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. eMedicine is an online clinical medical knowledge base that was founded in 1996. ... Georgetown University is a private university in the United States, located in Georgetown, a neighborhood of Washington, D.C. It is both the oldest Roman Catholic and oldest Jesuit university in the United States, having been founded on January 23, 1789 by Archbishop John Carroll. ... UM also has campuses in Dearborn and Flint. ... The anterior divisions of the lumbar nerve, sacral nerve, and coccygeal nerves form the lumbosacral plexus, the first lumbar nerve being frequently joined by a branch from the twelfth thoracic. ... 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. ...

Spinal cord

epidural space, dura mater, subdural space, arachnoid mater, subarachnoid space, pia mater, denticulate ligaments, conus medullaris, cauda equina, filum terminale, cervical enlargement, lumbar enlargement, anterior median fissure, dorsal root, dorsal root ganglion, dorsal ramus, ventral root, ventral ramus, sympathetic trunk, gray ramus communicans, white ramus communicans The Spinal cord nested in the vertebral column. ... The epidural space is a part of the human spine which is very close to the spinal cord, lying just outside the dura mater. ... The dura mater (from the Latin hard mother), or pachymeninx, is the tough and inflexible outermost of the three layers of the meninges surrounding the brain. ... The Cavum Subdurale (subdural space) is an artificial space created by the separation of the arachnoid mater from the dura mater as the result of trauma or pathologic process. ... The Arachnoid mater is one of the three layers of the meninges, interposed between the dura mater and the pia mater and separated from the pia mater by the subarachnoid space. ... The meninges (singular meninx) are the system of membranes that contain the brain. ... The pia mater (Latin: tender mother, itself a translation from Arabic) is the delicate innermost layer of the meninges - the membranes surrounding the brain and spinal cord. ... The pia mater has 21 pairs of denticulate ligaments which attach it to the arachnoid and dura maters. ... The conus medullaris is the terminal end of the spinal cord. ... The cauda equina is a structure within the lower end of the spinal column, that consists of nerve roots and rootlets from above. ... The spinal cord is a part of the vertebrate nervous system that is enclosed in and protected by the vertebral column (it passes through the spinal canal). ... The cervical enlargement corresponds with the attachments of the large nerves which supply the upper limbs. ... The lumbar enlargement (or lumbosacral enlargement) gives attachment to the nerves which supply the lower limbs. ... Anterior median fissure can refer to: Anterior median fissure of the spinal cord Anterior median fissure of the medulla oblongata Category: ... penis ... This is a dorsal root ganglion (DRG) from a chicken embryo (around stage of day 7) after incubation overnight in NGF growth medium stained with anti-neurofilament antibody. ... The posterior (or dorsal) branches (or divisions) of the spinal nerves are as a rule smaller than the anterior divisions. ... In anatomy and neurology, the ventral root is the efferent motor root of a spinal nerve. ... The sympathetic trunk (sympathetic chain, gangliated cord) is a bundle of nerve fibers that runs from the base of the skull to the coccyx. ... Each spinal nerve receives a branch, gray ramus communicans, from the adjacent ganglion of the sympathetic trunk. ...

grey matter: central canal, substantia gelatinosa of Rolando, reticular formation, substantia gelatinosa centralis, interneuron, anterior horn, lateral horn, posterior horn (column of Clarke, dorsal spinocerebellar tract) Grey matter is a major component of the central nervous system, consisting of nerve cell bodies and short nerve cell extensions/processes (axons and dendrites). ... Cross-section through cervical spinal cord. ... The apex of the posterior column is capped by a V-shaped or crescentic mass of translucent, gelatinous neuroglia, termed the substantia gelatinosa of Rolando (or gelatinous substance of posterior horn of spinal cord), which contains both neuroglia cells, and small nerve cells. ... Reticular formation is a part of the brain which is involved in stereotypical actions, such as walking, sleeping, and lying down. ... Throughout the cervical and thoracic regions the central canal is situated in the anterior third of the medulla spinalis; in the lumbar enlargement it is near the middle, and in the conus medullaris it approaches the posterior surface. ... An interneuron (also called relay neuron or association neuron) is a neuron that communicates only to other neurons. ... The anterior horn of the spinal cord (or anterior cornu, or anterior column) is the ventral (front) grey matter section of the spinal cord. ... In the thoracic region, the postero-lateral part of the anterior column projects lateralward as a triangular field, which is named the lateral column (lateral cornu, lateral horn). ... The posterior horn of the spinal cord is dorsal(more towards the back) to the anterior horn. ... The dorsal nucleus (column of Clarke, Clarkes columns, posterior thoracic nucleus) occupies the medial part of the base of the posterior column, and appears on the transverse section as a well-defined oval area. ... The dorsal spinocerebellar tract conveys proprioceptive information from the body to the cerebellum. ...

white matter: anterior funiculus: descending (anterior corticospinal tract, vestibulospinal fasciculus, tectospinal tract), ascending (anterior spinothalamic tract, anterior proper fasciculus) White matter is one of the two main solid components of the central nervous system. ... The most lateral of the bundles of the anterior nerve roots is generally taken as a dividing line which separates the antero-lateral region into two parts, viz. ... The anterior corticospinal tract (also called the direct pyramidal tract or anterior cerebrospinal fasciculus) is a small bundle of descending fibers that connect the cerebral cortex to the spinal cord. ... The tectospinal tract is part of the indirect extrapyramidal tract and is responsible for coordinating head and eye movements, It is responsible for impulses that are motor. ... The spinothalamic tract is the sensory pathway in the body that transmits pain, temperature, itch and crude touch. ... The remaining fibers of the anterior funiculus constitute what is termed the anterior proper fasciculus (anterior basis bundle). ...

lateral funiculus: descending (lateral corticospinal tract, rubrospinal tract, olivospinal tract), ascending dorsal spinocerebellar tract, ventral spinocerebellar tract, spinothalamic tract, lateral spinothalamic tract, anterior spinothalamic tract, spinotectal tract, posterolateral tract, lateral proper fasciculus, medial longitudinal fasciculus The most lateral of the bundles of the anteior nerve roots is generally taken as a dividing line which separates the antero-lateral region into two parts, viz. ... The corticospinal or pyramidal tract is a massive collection of axons that travel between the cerebral cortex of the brain and the spinal cord. ... The rubrospinal tract is part of the indirect extra-pyramidal tract and is responsible for large muscle movement such as the arms and the legs. ... The olivospinal fasciculus (Helweg) arises in the vicinity of the inferior olivary nucleus in the medulla oblongata, and is seen only in the cervical region of the medulla spinalis, where it forms a small triangular area at the periphery, close to the most lateral of the anterior nerve roots. ... The dorsal spinocerebellar tract conveys proprioceptive information from the body to the cerebellum. ... The ventral spinocerebellar tract conveys proprioceptive information from the body to the cerebellum. ... The spinothalamic tract is the sensory pathway in the body that transmits pain, temperature, itch and crude touch. ... The spinothalamic tract is the sensory pathway in the body that transmits pain, temperature, itch and crude touch. ... The spinothalamic tract is the sensory pathway in the body that transmits pain, temperature, itch and crude touch. ... The spinotectal tract (spinotectal fasciculus) is supposed to arise in the dorsal column and terminate in the inferior and superior colliculi. ... The posterolateral tract (fasciculus of Lissauer, tract of Lissauer) is a small strand situated in relation to the tip of the posterior column close to the entrance of the posterior nerve roots. ... The lateral proper fasciculus (lateral basis bundle) constitutes the remainder of the lateral column, and is continuous in front with the anterior proper fasciculus. ... The medial longitudinal fasciculus (MLF) is a group of axons on each side of the brainstem, that carry information about the direction that the eyes should move. ...

posterior funiculus: fasciculus gracilis, fasciculus cuneatus, posterior proper fasciculus The portion of the medulla spinalis which lies between the posterolateral sulcus and the posterior median sulcus is named the posterior funiculus. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... The fasciculus cuneatus (tract of Burdach) is triangular on transverse section, and lies between the fasciculus gracilis and the posterior column, its base corresponding with the surface of the medulla spinalis. ... The posterior proper fasciculus (posterior ground bundle; posterior basis bundle) arises from cells in the posterior column; their axons bifurcate into ascending and descending branches which occupy the ventral part of the funiculus close to the gray column. ...



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