Ch. 2: Peripheral Nervous System

Question 1

how is the peripheral nervous system divided structurally and functionally?

Answer 1

structurally - cranial nerves, spinal nerves, autonomic nervous system

functionally - somatic and autonomic nervous system

Question 2

cranial nerves

Answer 2

12 pairs
3 carry only sensory: olfactory, optic, auditory-vestibular nerve

4 carry only motor: oculomotor, trochlear, abducens, spinal accessory, hypoglossal

4 carry mixed sensory and motor: trigeminal, facial, glossopharyngeal, vagus: carries gut to brain messages

Question 3

parasympathetic v sympathetic nervous system and their neurotransmitters

Answer 3

parasympathetic: rest and digest, acetylcholine is the primary neurotransmitter released

sympathetic: flight or fight; arousal, norepinephrine is the primary neurotransmitter released

Question 4

somatic v automatic nervous system

Answer 4

somatic - voluntary movement

automatic - involuntary movement

Question 5

efferent v afferent nerves

Answer 5

efferent nerves carry motor signals away from CNS

afferent nerves carry sensory signals to the CNS