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Chapter 9 HAP
chapter 9 vocab
| Question | Answer |
|---|---|
| ax- | axle |
| axon | cylindrical nerve fiber that carries impulses away from a neuron cell body |
| dendr- | tree |
| dendrite | branched nerve fiber that serves as a receptor surface of a neuron |
| funi- | small cord or fiber |
| funiculus | major nerve tract or bundle of myelinated nerve fibers within the spinal cord |
| gangli- | a swelling |
| ganglion | mass of neuron cell bodies |
| -lemm | rind or peel |
| neurilemma | sheath that surrounds the myelin of a nerve fiber |
| mening- | membrane |
| meninges | membranous coverings of the brain and spinal cord |
| moto- | moving |
| motor nueron | neuron that stimulates a muscle to contract or a gland to secrete |
| peri- | all around |
| peripheral nervous system | portion of the nervous system that consists of nerves branching from the brain and spinal cord |
| plex- | interweaving |
| choroid plexus | mass of specialized capillaries associated with spaces in the brain. |
| sens- | feeling |
| sensory neuron | sensory receptor that stimulates a neuron to conduct impulses into the brain or spinal cord |
| syn- | together |
| synapse | junction between two neurons |
| ventr- | belly or stomach |
| ventricle | fluid-filled space within the brain |
| action potential | sequence of electrical changes when a nerve cell membrane is exposed to a stimulus that exceeds its threshold |
| autonomic nervous system | portions of nervous system that controls actions of viscera and skin |
| central nervous system | portion of the nervous system that consists of brain and spinal cord |
| convergence | nerve impulses arriving at the same neuron |
| divergence | a neuron sending impulses to multiple other neurons |
| effector | muscle or gland that responds to a stimulation |
| facillitation | subthreshold stimulation makes it more responsive to further stimulation |
| myelin | fatty material that forms a sheath like covering around some nerve fibers |
| neurotransmitter | chemical that axon ends secretes to control another neuron or any effector |
| nissl body | membranous sacs within cytoplasm of nerve cells that have ribosomes attached to their surfaces |
| parasympathetic nervous system | portion of autonomic nervous system that arises from brain and sacral region of spinal cord |
| reflex | rapid autonomic response to a stimulus |
| sensory receptor | specialized structure associated with the peripheral end of a sensory neuron specific to detecting a particular sensation and triggering a nerve impulse in response, which is transmitted to the central nervous system |
| somatic nervous system | motor pathways of peripheral nervous system that lead to the skeletal muscles |
| sympathetic nervous system | portion of autonomic nervous system that arises from the thoracic cavity and lumbar regions of spinal cord |