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40 Cards in this Set

  • Front
  • Back
how is the nervous system devided
CNS- brain a and spinal cord

PNS-out side the brain and cord
what are the two types of nervous system cells
neurons- which are fuctioning cells of the N.S.(they exhibit excitability and conductivity, and secrete neurotransmiters such as NE & Epi

supporting cells- which protect and provide metabolic support
name the supporting cells and thier locations
schwann cels in the PNS and the glial cells in the CNS
name the three parts of a neuron
cell body(soma), dendrites(conduct affarent info toward the cell body), Axon(long efferent processes cary info away)
what are nissel bodies
acidic RNA masses, which are involved in protein synthesis whithinn the cell body
what is the blood-brain-barrier made of
what is needed for repair of peripheral nerves
schwann cells that synthesize and release self-regulating autocrine sunstances, enableing them to survive without axons
what is the purpose of the myelin sheat, and what is it made of
speed conduction impulse.
it is made of swann cells in the PNS, and oligodendroglia in CNS. It has a high lipid content (white matter)
name a disease of demyelination in the CNS.

CNS-multiple sclerosis
PNS-guillian-bar syndrome
name the supporting cells of the PNS
schwann cells and satellite cells
what separates the cell bodies and processes of the peripheral nerves from the connective tissue framework of the ganglion
satellite cells
the successive fluid gaps that seperate shwann cells and permitt increased conduction are called
nodes of ranvier
the process created by the node of ranvier is called
saltatory conduction
each schwan cell along a peripheral nerve is encased in a sheath of basement membrane which is surrounded by losse connective tissue and is called
how does the endoneurial sheath promote nerve regeneration
by provideing a collagenous tube through which regeneration can reach it's former target
endoneurial sheaths are bundled with blood vessels into small bundles or clusters of nerves called
fascicles are surrounded by a proteetive covering called
during the wrapping of myelin the cytoplasm between the two adjacent inner leaflets of the plasm membrane is expelled. this produces a dark ine known as the
major dense line
what are the supporting cells of the CNS
oligodendroglial cells, astroglia, microglia, and ependimal cells
myelin in the CNS is formed by
oligodendroglial cells
name a glial cell that is promanent in the gray matter of the CNS
name the cell of the CNS resposible for cleaning up debris after cellular damage or cell death
name the cell that forms the lining of the neural tube cavity, the ventricular system
ependymal cell
what is the area called that produces CSF
choroid plexus
what % of cardiac output does the brain require
15% of resting CO
What does the CNS lack that inhibits it's ability to regenerate it's axon's if damaged
the endoneurial sheath does not penetrate the CNS
what can the nervous system use for energy other than glucose
ketones can provide for limited energy supply, but are rapidly depleted
what is the function of the myotatic or stretch reflex
controls muscle tone and helps maintain posture
what is proprioception
the sense of body position and movement that is relayed to the thalamus and the sensory cortex
what two types of sensory receptors are needed for proprioception
muscle spindle receptors and golgi tendon organs
what are muscle spindles
stretch receptors that are distributed throughout the belly of a muscle and transmit info about muscle length and rate of streach
what are golgi tendon organs
they are found in muscle tendons and transmit info about muscle tensiion or force of contraction at the junction of the muscle and the tendon that attaches to bone
what is the role of the tendon orgin
to equalize the contractile forces of the seperate muscle groups, spreading the load over all the fibers to prevent damage of overload
what makes up the hindbrain
medulla oblongata, pons, and the cerebellum
what are the neuronal circuits of the hindbrain
eating, breathing, and locomotive function required for survival
what cranial nerves arise from from the hidbrain
what cranial nerver arise from the midbrain
what two prominent bundles of nerve fibers pass along the ventral surface of the midbrain
cerebral perduncles, these fibers include the cortospinal tracts and are the main motor pathway between the forebrain and the pons
what makes up the forebrain
the telencephalon (end brain), diencephalon (between brain)
what cranial nerve arise from the diencephalon