Lateral horn


Lateral horn

Infobox Anatomy
Name = Lateral horn
Latin = cornu laterale medullae spinalis
GraySubject = 185
GrayPage = 753


Caption = A spinal nerve with its anterior and posterior roots. (Lateral column labeled at top.)


Caption2 = Transverse section of the medulla spinalis in the mid-thoracic region. (Lateral column labeled at center right.)
System =
Precursor =
MeshName =
MeshNumber =
DorlandsPre = c_55
DorlandsSuf = 12259818
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).

Nerve Cells in the Lateral Column

These form a column (the intermedioloateral cell column) which is best marked where the lateral gray column is differentiated, viz., in the thoracic region; but it can be traced throughout the entire length of the medulla spinalis in the form of groups of small cells which are situated in the anterior part of the formatio reticularis. The intermediolateral cell column exists at vertebral levels T1 - L2 and mediates the entire sympathetic innervation of the body. Preganglionic, myelinated GVA fibers from viscera course through prevertebral and paravertebral (sympathetic) ganglia, white rami and dorsal roots to synapse with cells of the intermediolateral cell column. These cells then give rise to preganglionic GVE fibers which will pass through ventral spinal roots, white rami, and into paravertebral ganglia where some will synapse, thus sending unmyelinated, postganglionic fibers through gray rami and into peripheral nerves. Those fibers that do not synapse in the paravertebral ganglia will eventually synapse at prevertebral ganglia near target viscera. Postganglionic neurons in the prevertebral ganglia send postganglionic fibers to target tissues.

In the upper part of the cervical region and lower part of the medulla oblongata as well as in the third and fourth sacral segments this column is again differentiated.

In the medulla it is known as the lateral nucleus.

The cells of this column are fusiform or star-shaped, and of a medium size: the axons of some of them pass into the anterior nerve roots, by which they are carried to the sympathetic nerves: they constitute the white rami and are sympathetic or visceral efferent fibers; they are also known as preganglionic fibers of the sympathetic system; the axons of others pass into the anterior and lateral funiculi, where they become longitudinal.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • lateral horn — n LATERAL COLUMN (1) …   Medical dictionary

  • lateral horn of spinal cord — cornu laterale medullae spinalis …   Medical dictionary

  • Lateral corticospinal tract — labeled in red at upper left. Latin tractus corticospinalis lateralis, fasciculus cerebrospinalis lateralis …   Wikipedia

  • lateral column — n 1) a lateral extension of the gray matter in each lateral half of the spinal cord present in the thoracic and upper lumbar regions called also lateral horn compare DORSAL HORN, VENTRAL HORN 2) LATERAL FUNICULUS …   Medical dictionary

  • lateral reticular nucleus — n a nucleus of the reticular formation that is situated in the ventrolateral part of the medulla oblongata, receives fibers esp. from the dorsal horn of the spinal cord, and sends axons to the cerebellum on the same side of the body …   Medical dictionary

  • Lateral ventricles — Brain: Lateral ventricles Scheme showing relations of the ventricles to the surface of the brain; oriented facing left …   Wikipedia

  • horn — Any structure resembling a h. in shape. SYN: cornu (1). [A.S.] Ammon h. [TA] one of the two interlocking gyri composing the hippocampus, the other being the dentate gyrus. Based on cytoarchitectural features, Ammon h. can be divided into …   Medical dictionary

  • Lateral ventricle — One cavity in a system of four communicating cavities within the brain that are continuous with the central canal of the spinal cord. The four ventricles consist of two lateral ventricles, the third ventricle and the fourth ventricle: Lateral… …   Medical dictionary

  • Lateral spinothalamic tract — Infobox Anatomy Name = PAGENAME Latin = tractus spinothalamicus lateralis GraySubject = 185 GrayPage = 762 Caption = Lateral spinothalamic tract is 5a, in blue at right center. Caption2 = Diagram of the principal fasciculi of the spinal cord.… …   Wikipedia

  • Lateral reticular nucleus — Brain: Lateral reticular nucleus Latin nucleus reticularis lateralis medullae oblongatae NeuroNames hier 724 NeuroLex ID nlx anat 20081246 The …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.