Terms in this set (19)
The part of the brain composed of the midbrain, pons, and medulla oblongata and connecting the spinal cord with the forebrain and cerebrum.
A large dorsally projecting part of the brain concerned especially with the coordination of muscles and the maintenance of bodily equilibrium, situated between the brain stem and the back of the cerebrum and formed in humans of two lateral lobes and a median lobe.
A convoluted ridge between anatomical grooves.
A momentary reversal in electrical potential across a plasma membrane (as of a nerve cell or muscle fiber) that occurs when a cell has been activated by a stimulus.
A long nerve cell process that usually conducts impulses away from the cell body.
Any of the usually branching protoplasmic processes that conduct impulses toward the body of a neuron.
An atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons.
A physician skilled in the diagnosis and treatment of disease of the nervous system.
A nerve cell; the fundamental unit of the nervous system, having structure and properties that allow it to conduct signals by taking advantage of the electrical charge across its cell membrane.
A substance (as norepinephrine or acetylcholine) that transmits nerve impulses across a synapse.
The time elapsing between the beginning of the application of a stimulus and the beginning of an organism's reaction to it.
An automatic and often inborn response to a stimulus that involves a nerve impulse passing inward from a receptor to the spinal cord and thence outward to an effector (as a muscle or gland) without reaching the level of consciousness and often without passing to the brain.
The place at which a nervous impulse passes from one neuron to another.
The ventral part of the vertebrate forebrain; functions in maintaining homeostasis, especially in coordinating the endocrine and nervous systems; secretes hormones of the posterior pituitary and releasing factors, which regulate the anterior pituitary.
An endocrine gland at the base of the hypothalamus; consists of a posterior lobe, which stores and releases two hormones produced by the hypothalamus, and an anterior lobe, which produces and secretes many hormones that regulate diverse body functions.
The transparent part of the coat of the eyeball that covers the iris and pupil and admits light to the interior.
The opaque muscular contractile diaphragm that is suspended in the aqueous humor in front of the lens of the eye, is perforated by the pupil and is continuous peripherally with the ciliary body, has a deeply pigmented posterior surface which excludes the entrance of light except through the pupil and a colored anterior surface which determines the color of the eyes.
The opening in the iris, which admits light into the interior of the vertebrate eye; muscles in the iris regulate its size.
The sensory membrane that lines most of the large posterior chamber of the vertebrate eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve.