nervous system Flashcards
what are the functions of the nervous system?
communication, regulating internal events, organising behaious(external), info storage, sensations, perceptions, emotions
what are glia?
more numerous than neurons, supportive and nutritive
what cells are involved in myelin formation in CNS & PNS?
PNS-schwann cells
CNS - oligodendrocytes
what constitutes PNS?
spinal and cranial nerves
what constitutes the CNS?
spinal cord and brain
what well defined part of the body do sensory axons(nerves) supply?
dermatomes- on body surface
what well defined part of the body do motor axons supply
myotomes-blocks of muscle
what are nerve plexuses?
peripheral nerves supply particular regions of the body, axons in spinal nerves form various peripheral nerves
what cranial nerve is distributed to the trunk?
vagus
what is the function on peripheral nerves?
carry info to and from CNS
what do afferent (sensory) nerves do?
carry info to CNS, associated with sensations/perceptions except from viscera
what do efferent (motor) nerves do?
carry info away from CNS, cause actions eg muscle contraction. somatic = voluntary muscle. visceral = ANS - SM and some glands
