CHAPTER 8: THE NERVOUS SYSTEM (kahoot questions (blood vessels = pia mater…
CHAPTER 8: THE NERVOUS SYSTEM
blood vessels = pia mater spinal cord
recep, sensory, inter,motor, effector
adrenergic synapse realese ; norenephrene
inate the realese of acetylcholine = calcium
chemical synapsys dominates
neuro transmiters are realesed from the synaptic knobs
spinal chord has 31 segments; each associated with a pair of dorsal root ganglia and their dorsal rootd and a paor of venrtal roots.
white mater contains mylinated and unmyolinated axons; gray matter contains cell bodies of neurons and glial cells.projections of rgey matter toard the outer surface of the spinal cord are called horns.
cholinergic synapese realese = acetylchonie
neutral communication moves from the presynaptic neuron to the post synaptic neauron caross the synapic cleft.
synapse is a site where intrcelluar communications occur through the realse of chemicals called neurotransmitters. synapese communicating eith other cells = neuroneffetor juction
an action potential appears when the membrane depolarizes to a level known as threshold
the opening of sodium channels and membrane depolarization. the closing i=of sodium channels and opening of potassium channels and return permeability
afferent: brings sensory information to the CNS (central nervous system
efferent: somatic nervous system (SNS) voluntary control over skeletal muscle contractions)
(ANS) ; automatic involuntary regulation of smooth muscle, cardiac muscle, and glandular muscle
dura matter covers the brain and spinal cord. the epurduail space seperates the spinal dura ater from the walls of the vertebral canal, r=the subarachnoid space of the arachnoid layer contains cerebrospinail fluid.
menengies orotect and support the spinal cord and delicate brain. the crainial menegies = dura mater, arachnoid, and pia mater.
CNS = spinal cord and brain
sensory neurons for afferent division and deliver info to the CNS -- motor neurons stimulate the activity of peripheral tissue --- inter neurons analyze sensory inputs and coordinate motor outputs
an axon has several dendrites ans synaptic terminals
neurons: information and transfer processing -- Neuroglia: supporting framework and act as phagocytes
NEUROGLIA : astrocytes - largest and most numerous. oligodendrocytes - responsible for myelontation of CNS. microglia - phagocytic cells from white blood cells. ependdymal cells - cerebral spinal fluid