reflex
what is a reflex
fast,predictable,involuntary responce to chnaged in the environment that helps maintain homeostasis
types of reflex:Somatic
A somatic reflex is an involuntary movemnent in responce to a stimulus
autonomic reflex
uncounscious motor reflexes relayed from the organs and glands to the CNS
SNS effector
voluntary skeletal muscles
ANS effectors
involuntary cardiac,smooth muscles,glands
location of reflexes: Spinal reflex
integration occurs in the spinal cord grey matter
cranial reflex
integration occurs in the brainstem
commonly tested reflex
biceps
triceps
ankle-jerk reflex
protection for the brain and spinal cord
-meninges
-bones
-blood brain barrier
meninges
3 protective connective tossue layers run around the surface of the brain and spinal cord
pia matter
innermost layer. A thin,transparent layer that adheres to the surface of the brain spinal cord. contains blood vessels that supply the spinal cord
Arachnoid matter
middle layer. A spider-web like arrangement of fibers in connective tissue
Dura matter
outermost layer. A thick,strong procteive layer
BBB( blood brain barrier)
a selective barrier to prevent passages of many substances moving from the blood into the brain tissue
defensive reflex:Cranial reflex
integration occurs in the brain stem
Deep flex :spinal reflex
integration occurs in the spinal cord grey matter