Anatomy benchmark 1, 2nd semester
Terms in this set (44)
the cytoplasmic extensions that, together with the cell body, provide the main receptive surfaces for neurons
masses of myelinated nerve fibers appear
when a nerve fiber is polarized, the concentration of
sodium ions is higher on thr outside of its membrane and potassium ions is higher on the inside.
produce myelin in the brain and spinal cord
id faster than conduction on an unmyelinated fiber
most of the neurons in the brain and spinal cord are
a painful, tangled mass of nerve fibers that sometimes develops following the amputation of a limb
when an action potential passes over the surface of a synaptic knob, the contents of the vesicles are released in response to the presence of
neurons are _____, whereas neuroglial cells are ___.
structural and functional units of the nervous system, accessory cells in nerve tissue.
old world remedy that has been tested for migranes?
cell that is only found in the PNS?
which type of molecule is myelin rich in?
an immune response that triggers an inflammation of the spinal cord and the brain, leaving scars
conveys action potential to the CNS
sensory (afferent) division of the PNS
transmits impulses from the CNS to the skeletal muscle
motor (efferent) division of the PNS
during the absolute refractory period, the cell
is insensitive to further stimulation
nerves are bundles of
two basic types of cells found in neural tissue
neurons, and neuroglial cells
small spaces between neurons
electrochemical messages are carried across synapses by
two groups of organs in the nervous system
CNS & PNS
basic unit structure and function of the nervous system is the
to what organelle in nonneural cells do nissl bodies in neurons correspond
tracts of myelinated axons in the CNS make up the
protective membranes around the spinal cord and brain
white matter that connects the two cerebral hemispheres
area of brain that is concerned with homeostasis
area of brain that serves as the relay station for all sensory input except smell
parts of the brain that has centers for the control of breathing, heart rate, and vasoconstriction
damage to brain stem is usually fatal?
injury to thalamus would
probably overload cerebrum with sensory info
cerebral gyri (convolutions) increase
surface area of cortex
gray matter on the outer surface of the cerebrum
area of brain associated with interpreting touch, pain, pressure, and temperature of skin
meninge that covers the surface of the skin
ventral root of a spinal nerve contains
ONLY motor fibers
norepinephrine and ephinephrine are neurotransmitters used by the
sympathetic nervous system
cerebrospinal fluid is produced by ____, and it functions to _____.
choroid plexuses in the ventricles, protects the brain from blows to the skulls
structure in a reflex arc
receptor, sensory nerve, interneuron, motor nerve, effector
complex problem solving, and control of voluntary muscles
hearing, and recognition of printed words
portion of brain stem that is continuous with the spinal cord