The Central and Peripheral Nervous Systems (VCE SSCE Psychology): Flashcards
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Two major divisions of nervous system
Two major divisions of nervous system
Central nervous system (CNS) & peripheral nervous system (PNS)
Components of CNS
Components of CNS
Brain and spinal cord
Approx. number of neurons in brain
Approx. number of neurons in brain
86 billion neurons
Number of cranial nerve pairs
Number of cranial nerve pairs
12 pairs
Length of spinal cord
Length of spinal cord
45 centimetres
Spinal reflex definition
Spinal reflex definition
Involuntary response without conscious brain input
Number of steps in spinal reflex process
Number of steps in spinal reflex process
5 steps
Two subdivisions of PNS
Two subdivisions of PNS
Somatic nervous system & autonomic nervous system
Sympathetic nervous system function
Sympathetic nervous system function
Increases arousal, fight-or-flight-or-freeze response
Parasympathetic nervous system function
Parasympathetic nervous system function
Maintains homeostasis & returns body to calm