Nervous System Flashcards
Nervous System
The master controlling and communicating system of the body.
Sensory input
Gathered information
Integration
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.
afferent
consists of nerve fibers that convey impulses to the CNS from sensory receptors.
efferent
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.
neuroglia
cells that generally support, isulate, and protect the deicate neurons.
Astrocytes
star shaped cells that account for nearly half of the neural tissue.
Microglials
spiderlike phagocytes that dispose of debris including dead brain cells, and bacteria.
ependymal cells
these line the cavities of the brain and spinal cord.
oligodendrocytes
wrap their flat extensions tightly around the nerve fibers.
Schwann cells
Axons outside the CNS
satellite cells
are precursors to skeletal muscle cell.
neurons
a specialized cell transmitting nerve impulses; a nerve cell.
dendrites
generate nerve impulses.
axons
conducts nerve cells away from the body
axon hillock
coneike region of the cell body.
axon terminals
contain hundreds of tiny vessels.
myelin
fibers convered with fatty material
myelin sheath
tight coil wrapped membranes.
nodes of Ranvier
gaps in schwann cells.
