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dec 1st test

unit 3

QuestionAnswer
what are membranes made up of? connective tissue and epithelial
dura mater tough mater; attaches to cranium
acrachnoid spider web like
pia mater nurishes
what are the 3 membranes dura mater, pia mater, arachnoid materthese 3 form the meninges
ectoderm germ layer of nervous tissue that starts the embryo
amytotic this is why the brain and spinal cord need to be protected
ans visceral nervous system
visceral internal, guts or organs
skeletal muscles these muscles are what makes you move your hand away from a hot stove itf you touch it
somatic nervous system skeletal muscle
somo body
cephalization head area
contralateral R side of the body controls the L side and the L side controls the R side
How many spinal nerves do we have? 31 and they are all mixed
12 pair of cranial nerves 5 motor 3 snesory 4 mixed
how big is a neuron compared to a nerve very small
sensory nerves to cns and they are only dendrites
motor nerves away from CNS and they are only axons
Nerve a bundle of neruon fibers (they have processes like dendrites and axon) theis is present in nervous system
where are internerurons found? in the spinal nerve
fact nerves do not have cell bodies they have processes
facial cranial nerves mixed nerves; they ahve both dendrites and axons
Functional Classification of Neurons Senory (or afferent), MOTOR (or efferent), INTERNEURONS (or association)
Senory neruron transmit impulses from sensory receptors in the skin or internal organs towards cns
Motor Neuron carry impulses away from the CNS to the effector organs ofthe body periphery
Interneuron lie b/t motor and sensory neurons and shuttle signals thru CNS pathways
synapse "to clasp or join" a junction that mediates info transfer from one neuron to the next
electrical synapse less common variety; consist of gap junctions like those found between certain other body cells
chemcial synapse specialized for release and reception of chemical neurotransmiters made up of 2 parts ; a knoblike axon and a neurotransmitter receptor region on the membrane of a dendrite
resting and polarized a membrane that is not conducting and impulse
what protects and nurishes neurons? astrocytes
classification of neurons by structure and function
Created by: lilwilkerson