PNS Flashcards
receptor
receives sensory stimulus
effector
responds to sensory stimulus with motor effect
motor efferent
descending motor pathway to affect somatic or visceral effectors
sensory afferent
ascending sensory pathway with stimulus from somatic or visceral receptors
dorsal roots
Central axons of sensory neurons located here
Posterior
ventral roots
location of motor cell bodies that create the ventral root with their axons
send motor information out to the periphery
dorsal root ganglion
location of cell bodies of sensory neurons, send information up the spinal cord to be processed.
mixed spinal nerve
contains both the axons of the ventral root and the peripheral sensory axons to create a nerve carrying both sensory and motor information
intervertebral foramina
location where mixed spinal nerves exit the spinal cord
dorsal ramus
mixed spinal nerve splits to go to different areas of the body
dorsal goes to the back
ventral ramus
mixed spinal nerves split to go to different areas of the body,
ventral goes to the rest of the body (excluding the back)
cervical spinal nerves
8 pairs of nerves
exit above corresponding vertebrae
C3- between C2 and C3
thoracic spinal nerves
12 pairs of nerves
exit below corresponding vertebrae
lumbar spinal nerves
5 pairs of nerves
sacral spinal nerves
5 pairs of nerves
