SC Segments, Roots, and Nerves

Question 1

Break down the 31 segments of the spinal cord NERVES?

Answer 1

8 CERVICAL
\+
12 THORACIC
\+
5 LUMBAR
\+
5 SACRAL
\+
1 COCCYGEAL

Question 2

The area from which a pair of these arise is defined as a segment of the SC, even though no distinct boundaries exist?

Answer 2

A PAIR OF DORSAL and VENTRAL ROOTS

Question 3

How many roots connect to each segment of the SC?

Answer 3

4
2 DORSAL
2 VENTRAL

Question 4

Each root is made up of ___ - ___ rootlets, and each root consists of bundled nerve fibers (axon).

Answer 4

1 - 8

Question 5

Where do the anterior (ventral) and posterior (dorsal) roots join together?

Answer 5

INTERVERTEBRAL FORAMEN
(exit as ventral/dorsal ramus)

Question 6

Spinal nerves are __________ nerves.

Answer 6

MIXED

Question 7

What part of the SC is particularly vulnerable to injury?

Answer 7

SPINAL NERVE

Question 8

The ventral (anterior) root contains axons that carry efferent signals to effectors (mm and viscera). Where do the cell bodies of these axons lie?

Answer 8

SC

Question 9

The dorsal root contains ____________ fibers.

Answer 9

AFFERENT

Question 10

Name the swelling that lies in the dorsal root, containing cell bodies of 1 ° neurons?

Answer 10

DORSAL ROOT GANGLION
aka
SPINAL GANGLION

Question 11

Do the dorsal and ventral ramus both contain motor and sensory fibers?

Answer 11

YES

Question 12

Which ramus leaving the intervertebral foramen is thicker?

Answer 12

VENTRAL RAMUS