Lp 1 Flashcards
(18 cards)
NS major Fxn?
`-sensory input
-integration
-motor output
CNS?
-brain-skull
-SC- vertebral column
2 major roles of CNS?
-sort & interpret signals (integration)
-Formulate responses
PNS components
-cranial nn- from brain/cranium
-spinal nn- from spinal cord
PNS: info about external & internal environments?
-somatic
-visceral
-proprioceptive, position of the body
Motor division of PNS activates appropriate effectors?
-somatic: voluntary, controls skeletal mm contraction
-autonomic: ANS- involuntary, controls smooth mm, cardiac mm & glands
Flow of electrical impulses?
Afferent: peripheral to central
Efferent: central to peripheral
Afferent pathways:
-begin w/sensory receptors
-terminate in CNS
Sensory input?
-conditioned reflexes
-posture
-patterns of behaviour
Efferent pathways:
-begin in CNS
-end in effectors
Motor output:
-controls appropriate contraction of mm
Sensorimotor:
-fxnal unity of NS
-flow of information is continuous & integrated
NS has 2 main types of cells:
-neutrons: excitable, impulse transmission
-neuroglia: supporting
CNS- neuroglia:
-Astrocytes: chemical environment
-microglia: phagocytic
-oligodendrocytes: myelin
-ependymal: CSF production
PNS-neuroglia:
-Schwann: myelin
-Satellite: chemical environment
-neurons= cells
-neuronal processes= axons
-axonal bundles= fascicles
-bundles of fascicles= nerve
Neurons are wrapped in CT sheaths:
-endoneurium
-perineurium
-epineurium
CT layers?
Protect & cushion NS structures
Enable mobility:
-nn: subjected to stress
-PNS: increase movement, decrease protection
-vulnerable- n root/spinal nn & superficial nerves
