PERIPHERAL NERVOUS
SYSTEM
This part of the
nervous system consists of:
·
. 31
pairs of spinal nerves
·
. 12
pairs of cranial nerves
·
. the autonomic
nervous system.
Most of the nerves of
the peripheral nervous system are composed of sensory nerve fibres conveying
afferent impulses from sensory organs to the brain, and motor nerve fibres
conveying efferent impulses from the brain to the effector organs, e.g.
skeletal muscles, smooth muscle and glands.
Each nerve consists
of numerous nerve fibres collected into bundles.
Each bundle has several
coverings of protective connective tissue.
·
. Endoneurium is a delicate tissue, surrounding each
individual fibre, which is continuous with the septa that pass inwards from the
perineurium.
·
. Perineurium is a smooth connective tissue, surrounding
each bundle of fibres.
·
. Epineurium is the fibrous tissue which surrounds and
encloses a number of bundles of nerve fibres. Most large nerves are covered by
epineurium.
HIT LIKE AND SHARE
0 Comments