BIOL 030 Lecture Notes - Lecture 29: Afferent Nerve Fiber, Spinal Cord, Ependyma

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The system of cells, tissues, & organs that regulates the body"s responses to internal & external stimuli. In vertebrates it consists of the brain, spinal cord, nerves, ganglia, & parts of the receptor and effector organs. Gather sensory information from the external environment (input) Excitatory, inhibitory, modulatory: glia (no axons) Afferent: afferent fibers are those that approach the cns andconvey information to the. Efferent: efferent fibers are those that exit the cns and convey information away from the cns. Ganglion: a collection of cell bodies in the pns with similar function. Nucleus: a collection of cell bodies in the cns with similar function. Tract, funiculus, fasiculus, column: collection of axons in white matter associated with ascending or descending pathways or connecting brain regions. Lower motoneuron has its cell body in the ventral horn of the spinal cord and an axon that innervates skeletal muscle.

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