Lecture 7 - ANS

Question 1

how many fibers in a spinal nerve

Answer 1

4

Question 2

what do we call nerves that can be found anywhere in the body

Answer 2

general

Question 3

types of nerve fibers

Answer 3

general somatic afferent
general somatic efferent
general visceral afferent
general visceral efferent

Question 4

what is housed in the DRG

Answer 4

cell bodies of afferent (somatic and visceral)

Question 5

what does the ANS innervate (3)

Answer 5

smooth muscle, cardiac muscle, glands (VISCERAL!)

Question 6

what fiber makes up autonomic

Answer 6

general visceral efferent

Question 7

what smooth muscle structures does the ANS innervate

Answer 7

eye, bladder, erectile tissue, GI tract, arrector pili, blood vessels

Question 8

what glands does the ANS innervate

Answer 8

sweat, salivary, lacrimal (tear), adrenal, liver

Question 9

what is special about ANS

Answer 9

2 neuron system, PURELY motor

Question 10

which neuron is myelinated in the ANS

Answer 10

preganglionic

Question 11

sympathetic vs parasympathetic

Answer 11

sympathetic: thoracocolumbar (T1-L2)
parasympathetic: craniosacral (S2-S4)

Question 12

what is the sympathetic division characterized by in terms of its fibers

Answer 12

short preganglionic fibers, long post ganglionic fibers

Question 13

where does the sympathetic portion synapse

Answer 13

in paravertebral ganglia (in the sympathetic chain) or prevertebral ganglia

Question 14

where in the prevertebral ganglia would the sympathetic system synapse

Answer 14

celiac, superior mesenteric, infererior mesenteric

Question 15

what houses the cell bodies in the ANS

Answer 15

intermediolateral nucleus – if you see this bump you know you’re in T1-L2

Question 16

to get to a prevertebral ganglion what would a neuron have to go through

Answer 16

splanchnic nerve

Question 17

greater splanchnic nerve

Answer 17

T5-T9

Question 18

lesser splanchnic nerve

Answer 18

T10-11

Question 19

least splanchnic nerve

Answer 19

T12

Question 20

lumbar splanchnic nerve

Answer 20

L1/L2

Question 21

pelvic splanchnic nerve

Answer 21

S2-S4

Question 22

which splanchnic nerves are in the sympathetic division

Answer 22

greater, lesser, least, lumbar

Question 23

which splanchnic nerves are in the parasympathetic division

Answer 23

S2-S4

Question 24

what cranial nerves innervate the parasympathetic

Answer 24

III, VIII, IX, X

Question 25

vagus nerve

Answer 25

nerve X

Question 26

the large intestine is innervated by

Answer 26

the cranial nerve (X) and pelvic splanchnic – division is LEFT COLIC FLEXURE