Flashcards in Nervous System Deck (35):
The master controlling and communicating system of the body.
makes decisions about what should be done at each moment.
Central nervous system
the brain, and spinal cord which occupy the dorsal body cavity.
Peripheral nervous system
the part of the nervous system outside the CNS. mainly consists of the nerves leaving the brain.
consists of nerve fibers that convey impulses to the CNS from sensory receptors.
carries impulses from the CNS to the effector organs the muscles and the glands.
somatic nerve system
allows us to consciously control our skeletal muscles.
Automatic Nervous system
regulates events that are automatic or involentary.
cells that generally support, isulate, and protect the deicate neurons.
star shaped cells that account for nearly half of the neural tissue.
spiderlike phagocytes that dispose of debris including dead brain cells, and bacteria.
these line the cavities of the brain and spinal cord.
wrap their flat extensions tightly around the nerve fibers.
Axons outside the CNS
are precursors to skeletal muscle cell.
a specialized cell transmitting nerve impulses; a nerve cell.
generate nerve impulses.
conducts nerve cells away from the body
coneike region of the cell body.
contain hundreds of tiny vessels.
fibers convered with fatty material
tight coil wrapped membranes.
nodes of Ranvier
gaps in schwann cells.
As the sodium rushes back into the cell the positive sodium ions raise the charge inside of the cell from negative to positive
is a short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls, following a consistent trajectory.
refers to the change in membrane potential that returns it to a negative value
anterior part of the skull.
The parietal lobe is positioned above the occipital lobe
at the front of the brain,
is the visual processing center
is located beneath the lateral fissure
the darker tissue of the brain and spinal cord,
cerebral white matter
lighter tissue of the brain