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Flashcards in Spinal Cord Deck (20)
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1
Q

Function of the Spinal Cord?

A

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

2
Q

What are the 3 main types of signals?

A

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

3
Q

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

A

31 pairs

4
Q

How many of each division of spinal nerves are there?

A

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

5
Q

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

A

Pia, Arachnoid and Dura mater

6
Q

Where is the CSF located? Btwn which two layers?

A

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

7
Q

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

A

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

8
Q

The denticulate ligaments come from which meningeal layer?

A

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

9
Q

The filum terminale is an extension of which meningeal layer?

A

Caudal extension of the pia mater

10
Q

The coccygeal ligaments is an extension of which meningeal layer?

A

The dura mater

11
Q

Nucleus Posteromarginalis - dorsal horn

A

Lamina I: reception of pain signals

12
Q

Substantia Gelatinosa - dorsal horn

A

Lamina II: reception of pain and temperature

13
Q

Nucleus Proprius - dorsal horn

A

Lamina III-VI: touch, pain and temperature

14
Q

Nucleus Dorsalis - dorsal horn

A

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

15
Q

Lateral Horn

A

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

16
Q

Ventral Horn divisions?

A

VIII and IX

17
Q

Lamina VIII

A

Inhibitory interneurons

18
Q

Lamina IX

A

Alpha motor neurons that innervate peripheral musculature

Gamma motor neurons (small diameter) innervate muscle spindle and accessory structures for muscle proprioception

19
Q

Anterior spinal artery

A

Blood supply to anterior 2/3 of spinal cord

20
Q

Posterior spinal artery(ies)

A

Blood supply to posterior 1/3 of spinal cord