Unit 2 Vocab ANAT

Term Definition
Central Nervous System The complex of nerve tissues that controls the activities of the body.
Peripheral Nervous System The portion of the nervous system that is outside the brain and spinal cord.
Brain An organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellectual and nervous activity.
Spinal Cord The cylindrical bundle of nerve fibers and associated tissue that is enclosed in the spine and connects nearly all parts of the body to the brain, with which it forms the central nervous system.
Dura Mater The tough outermost membrane enveloping the brain and spinal cord.
Arachnoid Mater A fine, delicate membrane, the middle one of the three membranes or meninges that surround the brain and spinal cord, situated between the dura mater and the pia mater.
Pia Mater The delicate innermost membrane enveloping the brain and spinal cord.
Cerebrospinal Fluid Fills subarachnoid space and ventricles, serves as cushion for the brain.
Nerves A bundle of fibers composed of neurons that connects the body parts and organs to the central nervous system and carries impulses from one part of the body to another.
White Matter Cell bodies and unmyerinated axons, outside of brain, inside of spinal cord.
Gray Matter Myelinated axons, inside of brain, outside of Spinal cord.
Myelin Mixture of proteins and phospholipids forming a whitish insulating sheath around many nerve fibers, increasing the speed at which impulses are conducted. Insulates neurons, sends signals faster, schwam cells, and oligodendrocytes.
Neurons A specialized cell transmitting nerve impulses; a nerve cell.
Interneurons Translates sensory to motor
Afferent Carries sensory information, Towards the CNS.
Efferent Carries motor information, Away from the CNS.
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