Lecture 7 - ANS Flashcards
how many fibers in a spinal nerve
4
what do we call nerves that can be found anywhere in the body
general
types of nerve fibers
general somatic afferent
general somatic efferent
general visceral afferent
general visceral efferent
what is housed in the DRG
cell bodies of afferent (somatic and visceral)
what does the ANS innervate (3)
smooth muscle, cardiac muscle, glands (VISCERAL!)
what fiber makes up autonomic
general visceral efferent
what smooth muscle structures does the ANS innervate
eye, bladder, erectile tissue, GI tract, arrector pili, blood vessels
what glands does the ANS innervate
sweat, salivary, lacrimal (tear), adrenal, liver
what is special about ANS
2 neuron system, PURELY motor
which neuron is myelinated in the ANS
preganglionic
sympathetic vs parasympathetic
sympathetic: thoracocolumbar (T1-L2)
parasympathetic: craniosacral (S2-S4)
what is the sympathetic division characterized by in terms of its fibers
short preganglionic fibers, long post ganglionic fibers
where does the sympathetic portion synapse
in paravertebral ganglia (in the sympathetic chain) or prevertebral ganglia
where in the prevertebral ganglia would the sympathetic system synapse
celiac, superior mesenteric, infererior mesenteric
what houses the cell bodies in the ANS
intermediolateral nucleus – if you see this bump you know you’re in T1-L2
to get to a prevertebral ganglion what would a neuron have to go through
splanchnic nerve
greater splanchnic nerve
T5-T9
lesser splanchnic nerve
T10-11
least splanchnic nerve
T12
lumbar splanchnic nerve
L1/L2
pelvic splanchnic nerve
S2-S4
which splanchnic nerves are in the sympathetic division
greater, lesser, least, lumbar
which splanchnic nerves are in the parasympathetic division
S2-S4
what cranial nerves innervate the parasympathetic
III, VIII, IX, X
vagus nerve
nerve X
the large intestine is innervated by
the cranial nerve (X) and pelvic splanchnic – division is LEFT COLIC FLEXURE
