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Posterior horn
From Wikipedia, the free encyclopedia
| Posterior horn | |
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| Section of medulla spinalis. The posterior horn is the upper protrusion of grey matter, labeled with "2" | |
| Latin | cornu posterius medullae spinalis |
| Gray's | subject #185 753 |
| Dorlands/Elsevier | c_55/12259855 |
The posterior horn (posterior column, posterior cornu, dorsal horn, spinal dorsal horn) of the spinal cord is the dorsal (more towards the back) grey matter of the spinal cord. It receives several types of sensory information from the body, including light touch, proprioception, and vibration. This information is sent from receptors of the skin, bones, and joints through sensory neurons whose cell bodies lie in the dorsal root ganglion.
The posterior grey horn is subdivided into these laminae. Below are several named examples of each lamina.
- Marginal lamina (Lamina I)
- Substantia gelatinosa (Lamina II)
- Nucleus proprius (Laminae III,IV,V)
- Column of Clarke (Lamina VII)
The other laminae are located in other regions of grey matter in the spinal cord.
 Section of the medulla oblongata through the lower part of the decussation of the pyramids |
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| Spinal nerve | Dorsal (Root, Ganglion, Ramus) • Ventral (Root, Ramus) • Sympathetic trunk • rami communicantes (Gray, White) |
| Gray matter/Rexed laminae | Posterior horn (Column of Clarke, Substantia gelatinosa of Rolando, Nucleus proprius) • Lateral horn • Anterior horn • Central canal/Substantia gelatinosa centralis |
| White matter: somatic/ascending (blue) | |
| White matter: motor/descending (red) |
Lateral: Corticospinal (Lateral) • Ep (Rubrospinal, Olivospinal) Anterior: Corticospinal (Anterior) • Ep (Vestibulospinal, Tectospinal, Reticulospinal) |
| Layers | Epidural space • Dura mater • Subdural space • Arachnoid mater • Subarachnoid space • Pia mater |
| Other structures | Denticulate ligaments • Conus medullaris • Cauda equina • Filum terminale • Cervical enlargement • Lumbar enlargement • Anterior median fissure |