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Chapter 9: Nervous System

Horizontales
a whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs
Central Nervous System
a junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter
a pea-sized conical mass of tissue behind the third ventricle of the brain, secreting a hormone-like substance in some mammals
a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse or junction, causes the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure
the part of the brain at the back of the skull in vertebrates. Its function is to coordinate and regulate muscular activity
a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body
Verticales
the long threadlike part of a nerve cell along which impulses are conducted from the cell body to other cells
an action that is performed as a response to a stimulus and without conscious thought
Peripheral Nervous System
a specialized cell transmitting nerve impulses
a myelin-secreting glial cell that spirally wraps around an axon of the peripheral nervous system to form the myelin sheath
a region of the forebrain below the thalamus which coordinates both the autonomic nervous system and the activity of the pituitary, controlling body temperature, thirst, hunger, and other homeostatic systems, and involved in sleep and emotional activity
either of two masses of gray matter lying between the cerebral hemispheres on either side of the third ventricle, relaying sensory information and acting as a center for pain perception
a hollow part or cavity in an organ