Structure of Peripheral Nerves
bundle of nerves surrounded by connective tissue
epineurium, perineurium, endoneurium
twelve pairs of cranial nerves connect the brain to head, neck, and trunk
most are mixed nerves, some are sensory only
names of the cranial nerves indicate their primary functions or distribution of fibers.
some cranial nerves are somatic and some are autonomic
31 pairs of spinal nerves of the following distribution :
these mixed nerves provide a two way communication between spinal cord and body
Each nerve has a dorsal and ventral root
dorsal root contains sensory fibers and has a dorsal root ganglion.
ventral root contains motor fibers
most spinal nerves combine to form plexuses
Brachial (C5 - T1)
Lumbar ( L1 - L4 )
Sacral ( L4 - S3 )