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Chapter 5: Nervous System

Name:_________________________________
Across
Glial cells associated with peripheral nerves whose cellular membrane forms the myelin sheath in the PNS.
Cell in the nervous system that support and protect neurons
A reduction in the voltage across a neuron or muscle cell membrane from its normal polarized state.
The required level of stimulation, or degree of change in a cells electrical potential, necessary to initiate an action potential.
A reflex that results in stimulation or inhibitory of smooth muscle, cardiac muscle or endocrine glands.
That part of the CNS made up of neuron cell bodies.
Reflex response that is more pronounced than normal
Composed of the brain and spinal cord
A whole body response resulting from an animal feeling threatened that prepares the body for intense physical activity
Nerve that carries impulses away from the CNS.
Nerves leaving the spinal cord
The receptive sites of the nerve cell.
A wave of cell membrane depolarization that travels from the point of stimulus down the length of a nerve cell process.
Reflex in which light is shone into one eye, and the pupil constricts in both eyes.
The radiographic procedure of injecting contrast media into the subarachnoid space to visualize better the outline of the spinal cord
Down
Functional barrier between capillaries in the brain and nervous tissue
The principle that an individual muscle fiber either contracts completely or not at all.
Basic functional unit of the nervous system
Reflex response is less than normal
Inhibitory neurotransmitter
Nerve that carries efferent impulses to muscles
Chemicals released by neurons at the synapse that tend to cause excitation or depolarization of other neurons or target tissue.
Nerve that carries impulses towards the central nervous system
Set of connective tissues that surround the brain and spinal cord.
Chemicals released by neurons at the synapse that tend to depress or decrease depolarization of other neurons or target tissue.
A nerve made up of both sensory nerve fibers and motor nerve fibers.
Nerves leaving the brain