The length of spinal cord in the opened dura mater sac, with the roots of spinal nerves. Seen from the ventral surface.

Translated by: Ronald A. Bergman, PhD and Adel K. Afifi, MD, MS
Peer Review Status: Internally Peer Reviewed

A. Pons Varoli.
B. Medulla oblongata.
C. Cervical portion of the spinal cord.
D. Thoracic portion of the spinal cord.
E. Lumbar portion of the spinal cord.

a) Middle Cerebellar Peduncle (Brachium pontis).
b) Pyramid.
c) Inferior Olive.
d) Anterior median fissure.
e) Cervical enlargement of spinal cord.
f) Lumbar enlargement of spinal cord.
g) Conus medullaris.
h) Filum terminale.
i) Denticulate ligaments.
k) Anterior root of spinal nerve.
l) Posterior root of spinal nerve.
m) Dorsal root ganglion.
n) Cauda equina.

1- 8) cervical nerves (8).
9 – 20) thoracic nerves (12).
21 – 25) lumbar nerves (5).
26 – 30) scaral nerves (5).
31) coccygeal nerve.