| Lumbar enlargement | |
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| Diagrams of the medulla spinalis. (Cervical enlargement labeled at center right.) | |
| Latin | intumescentia lumbosacralis |
| Gray's | subject #185 752 |
| Dorlands/Elsevier | i_11/12457957 |
The lumbar enlargement (or lumbosacral enlargement) gives attachment to the nerves which supply the lower limbs. It commences about the level of the ninth thoracic vertebra, and reaches its maximum circumference, of about 33 mm., opposite the last thoracic vertebra, below which it tapers rapidly into the conus medullaris.
External links
- lumbosacral+enlargement at eMedicine Dictionary
- Norman/Georgetown lesson6spinalcord&coverings
- SUNY Labs 02:08-0102 - "Vertebral Canal and Spinal Cord: Regions of the Spinal Cord"
- Atlas of anatomy at UMich n3a5p3 - "Spinal Cord, Fetus, Posterior View"
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 As such, some of the information contained herein may be outdated.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.
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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 |
