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52 terms

BIO259 - Cranial Nerves & the ANS

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again, what is the autonomic nervous system?
visceral motor pathways
cranial nerves
12 doubly-named pairs of nerves equivalent to the spinal nerves in that they feed directly into the brain from the PNS
cranial nerve 1
olfactory
cranial nerve 2
optic
cranial nerve 3
oculomotor
cranial nerve 4
trochlear
cranial nerve 5
trigeminal
cranial nerve 6
abducens
cranial nerve 7
facial
cranial nerve 8
vestibulocochlear
cranial nerve 9
glossopharyngeal
cranial nerve 10
vagus
cranial nerve 11
cranial accessory
cranial nerve 12
hypoglossal
cranial nerve functional groups
motor, sensory, combination
motor cranial nerves
3, 4, 6, 11, 12
sensory cranial nerves
1, 2, 8
combination cranial nerves
5, 7, 9, 10
when classifying cranial nerves into functional groups, how does proprioreception factor in?
ignore it because all of them are involved in it to some extent
autonomic nervous system pathways
divided into pre and post ganglionic neurons
preganglionic neurons are derived from
neural tube
post ganglionic neurons are derived from
neural crest
autonomic nervous system divisions
parasympathetic, sympathetic
parasympathetic ANS
maintains internal homeostasis
sympathetic ANS
prepares the body for activity
parasympathetic ANS divisions
cranial, sacral portions
cranial portion
association with the cranial nerves
sacral portion
association with spinal nerves
parasympathetic ANS fiber divisions
long preganglionic, short postganglionic
nerves associated with the parasympathetic cranial ANS
oculomotor (3), facial (7), glosspharyngeal (9), and vagus (10)
oculomotor nerve's involvement in cranial portion of parasympathetic
ciliary muscles and iris diaphragm of eyes
facial nerve's involvement in cranial portion of parasympathetic
lacrimal, nasal, and salivary glands
glossopharyngeal's involvement in cranial portion of parasympathetic
salivary glands
vagus' involvement in cranial portion of parasympathetic
heart, lungs, digestive system of abdomen
sacral portion's involvement in parasympathetic
collon, rectum, anus, bladder, gonads, erectile tissue
in parasympathetic ANS, heart and lungs (decrease, increase)
decrease
in parasympathetic ANS, digestions (decreases, increases)
increases
fibers in the sympathetic ANS
short preganglionic, long postganglionic
there are ___ types of ganglia in the sympathetic ANS:
2: paravertebral ganglia, prevertebral ganglia
paravertebral ganglia
22-24 pairs located lateral to the vertebral column; aka chain ganglia
prevertebral ganglia: definition
3 located further from the vertebral column; aka collateral ganglia
prevertebral ganglia: names and how they came up with the names
celiac, superior mesenteric, inferior mesenteric; come from name of the artery they sit on
there are ___ possibilities for neural arrangement of ganglia:
3: preganglionic axon enters the paravertebral ganglion and synapses immediately with postganglion, which carries to effector; preganglionic axon enters first paravertebral ganglion but goes up or down to a different post ganglion to synapse; preganglionic enters the nearest paravertebral ganglion then goes out to the effector and synapses closer to there
distribution of sympathetic ANS ganglia
head, thoracic viscera, abdominal viscera, pelvic viscera, body wall and limbs
distribution of sympathetic ANS ganglia: head
output to structures associated with the head (intrinsic eye muscles, lacrimal and salivary glands, etc.)
distribution of sympathetic ANS ganglia: thoracic viscera
output to heart, lungs, esophagus
distribution of sympathetic ANS ganglia: abdominal viscera
output to organs of abdomen (stomach, intestines, kidneys, etc.)
distribution of sympathetic ANS ganglia: pelvic viscera
output to bladder, gonads, erectile tissue
distribution of sympathetic ANS ganglia: body wall and limbs
output to blood vessels, arrector pili, sweat glands
some specific actions of the sympathetic ANS
dilate pupils, bronchioles, and blood vessels; increase heart rate and blood flow to skeletal muscle; decrease peristalsis and glandular secretion
control of the ANS occurs in the
hypothalamus
control of the ANS: conscious or subconscious?
subconscious, but can be minimally influenced by consciousness (indirectly)