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CH 12 and 13--SPINAL NERVES
Terms in this set (22)
What type of axons are in sensory nerves?
name 2 that contain. (note: these are less common)
olfactory and optic "some say"
What FIBERS are in a mixed nerve?
sensory and motor fibers.
how do mixed nerves transmit signals?
in 2 directions
Most nerves in the body are?
Spinal Nerves form __________, entering or exiting the spinal cord.
Each spinal nerve connects to the spinal cord through these.
Dorsal Roots arise from what type of neuron? these neurons come from where? what type of fiber ?
Ventral Roots arise from what type of fiber?
Sensory ; the DRG; Sensory (Afferent)
The DRG. it contains cell bodies pf the ____________ neurons.
There is _____ pair per spinal cord segement
What root has axons from sensory neurons and brings sensory info into the spinal cord?
What root contains axons from motor neurons (soma in spinal cord) , exiting spinal cord to control somatic and visceral effectors?
1 pair per spinal cord segment. IS this true for dorsal, DRG, and ventral roots?
YES -all one pair per segment.
the sensory and motor roots are bound together-distally-forming the ?
spinal nerve, which is classified as a mixed nerve
What does the spinal nerve branch out into?
Rami (plural form of Ramus)
Dorsal (back)= to __________
Ventral(belly)= the ______________ nerves
Communicating Rami= the _______________ NS
ALL OTHER RAMI (cervical, lumbar, sacral)
Dorsal (back)= to _______
Ventral(belly)= form what?
complex nerve plexuses (5)
In the thoracic spinal nerve rami, motor output from the __________ root goes through 3 places.
1. Communicating Ramus: Motor output via ______________ ______________
white ramus is _______-ganglionic and myelinated
gray ramus is __________-ganglionic and Not
Sensory Input is the ______________ Ramus only. the input is from _________
2. Dorsal Ramus: Motor output mainly to ________________ _____________ of the trunk responsible for moving vertebral column.
Sensory Input is from the __________.
3. Ventral Rami: Motor output to ____________ __________________
Sensory input is from ________of trunk.
Rami VENTS on the coast.
Dorsal has muscles in her back.
ALL OTHER Nerve Rami:
Dorsal Rami: Sends Motor Output to the ____________ _________________ of the vertebral column. they receive _____________ input from the skin of the back
the Ventral rami of these regions form what?
Complex nerve plexuses.
What does plexus mean?
which spinal nerves have these? (3)
braid--an interwoven network of nerves.
Cervical, Lumbar, Sacral
During development, small muscles that are innervated by distinct VENTRAL RAMI can fuse. As a result the ventral rami of the various nerves blend together producing a "braid" called a ?
How many plexuses are there?
Chris Brown Levi Strauss Cox
Cervical Brachial lumbar Sacral Coccygeal
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