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Flashcards in Spinal Cord Deck (14)
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1

Function and length of spinal cord

F: Nerve impulse propagation
A: Extends from medulla and foramen magnum to conus medullaris L1-2 IV joint
-cauda equina L2-S5 (PNS)

2

Spinal Nerves

31 paired spinal nerves
-8 cervical
-12 thoracic
-5 lumbar
-5 sacral
-1 coccygeal

3

What are the 2 enlargements of the spinal cord?

cervical
-C5-T1: brachial plexus
lumbar
-T11-L2: lumbosacral plexus

4

Meninges

Epidural space
Dura mater
Subdural space
Arachnoid mater
Subarachnoid space
Pia mater

5

Epidural space

"Cushion" composed of fatty tissue, lymphatics, blood vessels, nerve roots

6

Dura mater

single layer of fibrous tissue
-anchor for peripheral nerves to SC
-extends to S2 vertebral level

7

Subdural space

interstitial fluid

8

Subarachnoid space

contains CSF
-spinal tap takes place here

9

Pia mater

Filum terminale= fibrous extension of pia at the end of conus medullaris
-anchors SC to coccyx

10

Basic SC anatomy

Composed of gray (inside) and white (outside) matter

11

Gray matter anatomy

dorsal horn= sensory neurons
intermediate zone= interneurons
-T1-L2: lateral horn (symp. pregang neurons)
-S2-S4: lateral horn (para. pregang neurons)
ventral horn= motor neurons
-somatotopically organized

12

White matter ascending and descending columns

-dorsal column= sensory fibers (ascending)
-ventral column=mixed (primarily motor)
-lateral column= mixed
-some somatotopically organized, others not

13

White matter sulci, septum, and fissure

Dorsolateral sulcus: entrance for dorsal roots
Dorsal intermediate sulcus: splits dorsal columns into fasciculi cuneatus and gracilis
Ventral lateral sulcus: exit for ventral roots
Dorsal median septum: sheet of glial cells folded inwards
-Turns to dorsal median sulcus in caudal SC
Ventral median fissure: fold in pia mater
-Anterior spinal artery

14

Structural differences between different levels of the SC

white matter increases from lumbosacral --> cervical
-exception: cranial enlargement
volume of gray matter is highest in cervical and lumbar enlargements