Lumbar enlargement

Widened area of spinal cord attaching to lower limb nerves

Lumbar enlargement

Diagrams of the medulla spinalis. (Cervical enlargement labeled at center right.)

Details
Identifiers
Latin| intumescentia lumbosacralis
TA98| A14.1.02.003
TA2| 6051
FMA| 74895
Anatomical terminology

[edit on Wikidata]

The lumbar enlargement (or lumbosacral enlargement) is a widened area of the spinal cord that gives attachment to the nerves which supply the lower limbs.

It commences about the level of T11 and ends at L2, and reaches its maximum circumference, of about 33 mm. Inferior to the lumbar enlargement is the conus medullaris.[1]

An analogous region for the upper limbs exists at the cervical enlargement.

## Additional images

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* Spinal cord. Spinal membranes and nerve roots. Deep dissection. Posterior view.

## References

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This article incorporates text in the public domain from page 752 of the 20th edition of Gray's Anatomy (1918)

1. ^ "Anatomy of the Spinal Cord (Section 2, Chapter 3) Neuroscience Online: An Electronic Textbook for the Neurosciences | Department of Neurobiology and Anatomy - the University of Texas Medical School at Houston". Archived from the original on 2011-10-08. Retrieved 2014-08-27.

## External links

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* lesson6spinalcord&coverings at The Anatomy Lesson by Wesley Norman (Georgetown University)
* Anatomy photo:02:08-0102 at the SUNY Downstate Medical Center - "Vertebral Canal and Spinal Cord: Regions of the Spinal Cord"
* Atlas image: n3a5p3 at the University of Michigan Health System - "Spinal Cord, Fetus, Posterior View"

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Spinal cord

General features|

* Cervical enlargement
* Lumbar enlargement
* Conus medullaris
* Filum terminale
* Cauda equina
* Meninges
* Central canal
* Terminal ventricle

Grey columns|

| Posterior grey column|

* Marginal nucleus
* Substantia gelatinosa of Rolando
* Nucleus proprius
* Rexed lamina V
* Rexed lamina VI

|

Lateral grey column|

* Intermediolateral nucleus
* Posterior thoracic nucleus

Anterior grey column|

* Interneuron
* Alpha motor neuron
* Onuf's nucleus
* Gamma motor neuron

Other|

* Rexed laminae
* Central gelatinous substance
* Gray commissure

White matter|

| Sensory|

| Posterior|

* Posterior column-medial lemniscus pathway
* Gracile
* Cuneate

|

Lateral|

* Spinocerebellar
* dorsal
* ventral
* Spinothalamic
* lateral
* anterior
* Posterolateral
* Spinotectal

Anterior|

* Spinoreticular tract
* Spino-olivary tract

Motor|

| Lateral|

* Corticospinal
* Lateral
* Extrapyramidal
* Rubrospinal
* Raphespinal
* Reticulospinal
* Hypothalamospinal

|

Anterior|

* Corticospinal
* Anterior
* Extrapyramidal
* Vestibulospinal
* Reticulospinal
* Tectospinal
* Raphespinal
* Olivospinal

Both|

* Anterior white commissure

External features|

* Ventral
* Anterior median fissure
* Anterolateral sulcus
* Dorsal
* Posterior median sulcus
* Posterolateral sulcus

Portal:

* Anatomy

Authority control databases |

* Terminologia Anatomica

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