CH 3: PNS: fibers of the spinal nerves Flashcards
somatic nerves in the periphery=
the fibers that innervate the muscles, joints and skin of the body wall
visceral nerves in the periphery=
innervate the internal organs of the body cavities and blood vessels throughout the body
sensory fibers=
afferent
motor fibers=
efferent
general nerve fibers=
innervate skin, muscles, bones and viscera throughout the body
all nerve fibers in the spinal nerves are general
special nerve fibers=
reserved for sensory organs and muscles found only in unique regions in the head (retina, inner ear)
cranial nerves as a group contain both general and special fibers
general afferent fibers of the spinal nerves are ____ fibers with cells of origin in the _____
sensory fibers
dorsal root ganglia
dorsal root ganglia cells are
round and have only 1 process leaving the cell body.
the process from the dorsal root ganglia cells splits into..
1: peripheral branch: which enters the nerve
2: central branch: which passes through the dorsal root to the SC
general somatic afferent (GSA) fibers carry:
1: exteroceptive information:
2: proprioceptive information:
exteroceptive information from:
from receptors in the skin that mediate pain, temperature and touch
proprioceptive information from:
from sensory endings in muscles, tendons, and joints that mediate position sense, muscle length, rate of change of muscle length and muscle contraction
general visceral afferent (GVA) fibers carry:
interoceptive information
interoceptive information from:
from receptors in visceral structures that mediate data concerning distension and contraction of these structures
general efferent fibers are _____ fibers with cells of origin in the ______
motor fibers
spinal cord