Spinal Cord Flashcards Preview

BU Anatomy > Spinal Cord > Flashcards

Flashcards in Spinal Cord Deck (20):
1

Function of the Spinal Cord?

Serve as a conduit for signal flow between peripheral sensory structures and brain and back to motor outpus

2

What are the 3 main types of signals?

Sensory - afferent to brain
Motor - efferent from brain
Intrinsic circuits - those involved in spinal reflexes

3

How many pairs of spinal nerves emerge from the spinal cord?

31 pairs

4

How many of each division of spinal nerves are there?

8 Cervical, 12 Thoracic, 5 Lumbar, 5 Sacral and 1 Coccygeal

5

Name the 3 coverings of the spinal cord from deep to superficial.

Pia, Arachnoid and Dura mater

6

Where is the CSF located? Btwn which two layers?

In the subarachnoid space - btwn the pia and the arachnoid mater

7

Where does the spinal cord end? What structure exists there in the absence of the cord?

L1/L2 - conus medularis; lack of cord produces a lumbar cistern

8

The denticulate ligaments come from which meningeal layer?

The pia mater = lateral projections outwards to the dura that stabilize the spinal cord

9

The filum terminale is an extension of which meningeal layer?

Caudal extension of the pia mater

10

The coccygeal ligaments is an extension of which meningeal layer?

The dura mater

11

Nucleus Posteromarginalis - dorsal horn

Lamina I: reception of pain signals

12

Substantia Gelatinosa - dorsal horn

Lamina II: reception of pain and temperature

13

Nucleus Proprius - dorsal horn

Lamina III-VI: touch, pain and temperature

14

Nucleus Dorsalis - dorsal horn

Lamina VII: Clarke's column (C8-L2/3) - muscle sense to brain

15

Lateral Horn

Lamina VII: found only in thoracic segments; autonomic efferent cell bodies

16

Ventral Horn divisions?

VIII and IX

17

Lamina VIII

Inhibitory interneurons

18

Lamina IX

Alpha motor neurons that innervate peripheral musculature
Gamma motor neurons (small diameter) innervate muscle spindle and accessory structures for muscle proprioception

19

Anterior spinal artery

Blood supply to anterior 2/3 of spinal cord

20

Posterior spinal artery(ies)

Blood supply to posterior 1/3 of spinal cord