CNS/sensory 1-2

Question 1

What are the 2 major divisions of the nervous system?

Answer 1

Afferent neurons (sensory input) & efferent neurons (motor output)

Question 2

Location of the cell bodies of the afferent vs efferent neurons of the nervous system

Answer 2

Afferent: dorsal root ganglion (out of CNS)
Efferent: basal nuclei (in the CNS)

Question 3

What are the 2 different types of efferent neurons?

Answer 3

Somatic & autonomic efferent

Question 4

Somatic VS Autonomic efferent

Answer 4

Somatic efferent
-Only excitatory (Ach)
-Innervates skeletal muscle
-Motor neurons

Autonomic efferent
-Smooth & cardiac muscle
-Innervates interneurons
-Excitatory & inhibitory

Question 5

Which type of efferent neurons are only excitatory?

Answer 5

Somatic efferent neurons

Question 6

Where are almost half of neurons located?

Answer 6

Cerebellum

Question 7

How thick is the gray matter?

Answer 7

2 mm thick

Question 8

What is the main role of the limbic system?

Answer 8

Process & regulate emotion, memory & sexual

Question 9

What composes the white matter?

Answer 9

Myelinated axons

Question 10

What are the 5 divisions of the spinal cord

Answer 10

Cervical nerves (8 pairs)
Thoracic nerves (12 pairs)
Lumbar nerve (5 pairs)
Sacral nerves (5 pairs)
Coccygeal nerves (1 pair)

Question 11

How many spinal segments are there in the spinal cord?

Answer 11

31 pairs

Question 12

What do the different divisions of the spinal cord innervate?

Answer 12

Cervical: hands, neck & shoulders

Thoracic: shoulders, chest & upper abdominal wall

Lumbar: lower abdominal wall, hips & legs

Sacral: lower digestive track & genitals

Coccygeal: nothing specific

Question 13

Which part of the body do the cranial nerves & thoracic nerve both innervate?

Answer 13

Shoulders