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Nervous System
Nervous System Vocabulary Terms
| Term | Definition |
|---|---|
| Blood vessels (capillaries) that selectively let certain substances enter brain tissue and keep others out | blood-brain barrier |
| Type of glial (neuroglial) cell that transports water and salts from capillaries | astrocyte |
| Collection of spinal nerves below the end of the spinal cord | cauda equina |
| Neurotransmitter chemical released at the ends of nerve cells | acetylcholine |
| Microscopic fiber that carries the nervous impulse along a nerve cell | brainstem |
| Carries messages toward the brain and spinal cord from receptors | axon |
| Lower portion of the brain that connects the cerebrum with the spinal cord | afferent nerve |
| Part of a nerve cell that contains the nucleus | cell body |
| Middle layer of the meninges surrounding the brain and spinal cord | arachnoid membrane |
| Contains nerves that control involuntary body functions or muscles, glands, and internal organs | autonomic nervous system |
| Motor nerve that carries messages away from the brain and spinal cord | efferent nerve |
| Largest part of the brain | cerebrum |
| Includes the brain and spinal cord | central nervous system |
| Microscopic branching fiber of a nerve cell that is the first to receive a nervous impulse | dendrite |
| Posterior part of the brain; coordinates muscle movements and maintains balance | cerebellum |
| Glial (neuroglial) cell that lines membranes within the brain and spinal cord; helps form cerebrospinal fluid | ependymal cell |
| Outer region of the cerebrum; contains sheets of nerves | cerebral cortex |
| Circulates throughout the brain and spinal cord | cerebrospinal fluid |
| Thick, outermost layer of the meninges | dura mater |
| Twelve pairs of nerves that carry messages to and from the brain | cranial nerves |