Nervous System Overview

Question 1

CNS Location and Components

Answer 1

Inside skull and vertebral column

Components are cerebral hemisphere (cerebrum & diencephalon), brain stem (midbrain, pons, and medulla), cerebellum, and spinal chord

Question 2

PNS Location and Comonents

Answer 2

Located outside skull and vertebral column

Components are spinal nerves (from spinal chord) and cranial nerves (from brain stem)

Question 3

Spinal Nerves

Answer 3

Derived from the spinal chord segments:

Cervical Nerves (8, but 7 vertebrae)
Thoracic Nerves (12)
Lumbar Nerves (5)
Sacral Nerves (5, but 1 sacrum)
Coccygeal Nerve (1)

Question 4

Cranial Nerves

Answer 4

12 Cranial Nerves

CN I & II derived from cerebral hemisphere
CN III to X and CN XII derived from Brain Stem
CN XI (Accessory) derived from cervical spinal chord

Question 5

Ganglia

Answer 5

Collection of nerve cell bodies located outside the CNS

Question 6

Sensory Ganglia cell body location

Answer 6

Pseudounipolar

Both somatic (body) and visceral (heart, stomach, intestine, etc) sensory

Spinal nerve ganglia (dorsal or posterior root ganglia)

Cranial nerve ganglia (CN V, VII, VIII, IX, X)
Cranial nerves DO NOT have dorsal or ventral root

Question 7

Autonomic/Motor/Visceral Ganglia cell body location

Answer 7

Multipolar

Sympathetic Ganglia

Parasympathetic Ganglia

Question 8

Nuclei

Answer 8

Collection of nerve cell bodies IN the CNS

Question 9

Vestibulocochlear Nerve (CNVIII)

Answer 9

Sensory Ganglion, chochlear, spiral, or vestibular

All ganglion of CNVIII have bipolar cell bodies

Located in Ear

Question 10

What nerves are associated with sensory functions and where are the cell bodies found?

Answer 10

Sensory ganglion nerve cell bodies associated with spinal and cranial nerves are located in sensory ganglia outside the CNS

Question 11

Where are autonomic, motor, or visceral ganglia cell bodies found? What type of cells are they?

Answer 11

Autonomic motor nerve cell bodies are located in motor of viscderal ganglia found outside the CNS. They have multipolar cell bodies.