2A.3 THE PERIPHERAL NERVOUS SYSTEM

Question 1

Characteristics of the spinal cord?

Answer 1

• 2 enlarged areas with a greater number of neurons for limb innervation:

1) Cervical enlargement:
> Cervical plexus
> Brachial plexus’

2) Lumbar enlargement:
> Lumbar plexus
> Sacral plexus

• Ends at - L1/L2 at Conus Medullaris
• Remaining structure of nerves is termed the Cauda Equina (horse’s tail)

Question 2

what spinal cord structure contains only motor neurons?

Answer 2

ventral root

Question 3

what spinal cord structure contains only sensory neurons?

Answer 3

dorsal root

Question 4

What spinal cord structure contains the cell body of sensory neurons?

Answer 4

Dorsal root ganglion

Question 5

What spinal structure contains both sensory and motor neurons but goes through the intervertebral foramen?

Answer 5

spinal nerve

Question 6

what spinal structure has sensory and motor neurons and includes autonomics (most named nerves)?

Answer 6

Ventral rami

Question 7

what spinal structure has sensory and motor neurons but is to deep back & has z joints (smaller branches)?

Answer 7

Dorsal rami