neuroscience - anatomy of spinal cord

spinal cord extends from foramen magnum to …

L1-L2 and terminates at the conus medullaris.

how many pairs of mixed spinal nerves?

31 (8 cervical, 12 thoracic,5 lumbar, 5 sacral and 1 coccygeal)

where do C8-S5 exit ?

caudally to the corresponding vertebrae

where do C1-C7 exit?

rostrally to the corresponding vertebrae

where is the cervical enlargement?

C5-T1

where is the lumbosacral enlargement?

L1-S3

filum terminale internum

closed portion of dural sac at s2

filum terminale externum

extension of the filum terminale that anchors the spinal cord to the coccyx

anchors the spinal cord within the dural sac

denticulate ligaments.

caudal end of the spinal cord to S2, suitable for lumbar puncture

L3-L4 in adults, L4-L5 in children (lumbar cistern)

position of motor spinal nerves

anterior horn

position of sensory spinal nerves

posterior horn

fissure of spinal cord continuous with medulla oblongata

Anterior median fissure

lateral to anterior median fissure and between anterior roots

anterior funiculus

how many sulci on posterior surface of spinal cord?

3 (posterior median, posterior intermediate and posterolateral)

how many lateral white columns on the posterior surface of the spinal cord?

2 (fasciculus gracilis and fasciculus cuneatus)

longitudinal artery supplying the spinal cord

anterior spinal artery

anterior spinal artery arises from the …

vertebral arteries

what arteries supply the anterior spinal cord?

segmental spinal, radicular arteries, medullary arteries

largest medullary artery

artery of Adamkiewicz (T9-L1)

arteries that supply the posterior spinal cord

posterior spinal arteries and arterial vasocorona

venous drainage of the spinal cord

3 anterior and 3 posterior spinal veins that drain into medullary and radicular veins

grey matter is capped by a zone of closely packed neurons for pain processing called …

substantia gelatinosa

what does white matter consist of ?

ascending and descending tracts.

a bundle of one or more fasiculi

funiculus

2 sides of grey matter are connected by …

the gray commissure.

how many funiculi in each half of the spinal cord?

three funiculi: dorsal, lateral, and ventral.

tracts for lower down in the body are more … in the spinal cord

medial