BIO 11 Lecture Notes - Lecture 11: Skeletal Muscle, Upper Motor Neuron, Oligodendrocyte
Document Summary
Motor functions (pns) = stimulation of a muscle cell contraction or a gland secretion. Sensory functions (pns) = detection of sensations within and outside the body. Higher mental functions such as use of language and learning. Afferent: fibers that approach the cns and convey information to the cns. Efferent: fibers that exit the cns and convey information away from the cns. Ganglion: collection of cell bodies in the pns with similar function. Nucleus: collection of cell bodies in the cns with similar function. Tract, funiculus, fasciculus, column: collection of axons in white matter associated with ascending or descending pathways or connecting brain regions. Lower motor neuron has its cell body in the ventral horn of the spinal cord and an axon that innervates skeletal muscle. Upper motor neuron have their cell bodies in the forebrain/brainstem and send their axons to activate lower motor neurons. Basic structure of the brain and spinal cord.
