Chapter 8 A (The Nervous System) Flashcards
Acetylcholine
Chemical that stimulates cells
Afferent (sensory) neuron
Neuron that carries information from the sensory receptors to the central nervous system
Arachnoid
Middle Layer of the Meninges
Astrocyte, Astroglia
A type of neuroglia that maintains nutrient and chemical levels in neurons
Autonomic nervous system
Part of the peripheral nervous system that carries impulses from the central nervous system to glands, smooth muscles, cardiac muscle, and various membranes
Axon
Part of a nerve cell that conducts nerve impulses away from the cell body
Basal ganglia
Large masses of gray matter within the cerebrum
Brain
Body organ responsible for controlling the body’s functions and interactions with outside stimuli
Brainstem
One of the four major divisions of the brain; division that controls certain heart, lung, and visual functions
Cell body
Part of a nerve cell that has branches or fibers that reach out to send or receive impulses
Central nervous system
The brain and spinal cord
Cerebellum
One of the four major divisions of the brain; division that coordinates musculoskeletal movement
Cerebral Cortex
Outer portion of the cerebrum
Cerebrospinal
Watery fluid that flows throughout the brain and around the spinal cord
Cerebrum
One of four major divisions of the brain; division involved with emotions, memory, conscious thought, moral behavior, sensory interpretations, and certain bodily movements
Conductivity
Ability to transmit a signal
Convolutions
Folds in the cerebral cortex; gyri
Corpus callosum
Bridge of nerve fibers that connects the two hemispheres of the cerebrum
Cranial nerves
Any of 12 pairs of nerves that carry impulses to and from the brain
Dendrite
A thin branching extension of a nerve cell that conducts nerve impulses toward the cell body
Diencephalon
One of four major structures of the brain; it is the deep portion of the brain and contains the thalamus
Dura matter
Outermost layer of meninges
Efferent (Motor) Neuron
Neuron that carries information to the muscles and glands from the central nervous system
Epidural space
Area between the pia mater and the bones of the spinal cord
Epithalamus
One of the parts of the diencephalon; serves as a sensory relay system