CAS BI 325 Chapter Notes - Chapter 13: Alpha Motor Neuron, Dorsal Root Ganglion, Ventral Root Of Spinal Nerve

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Lines digestive tract, arteries, and related structures; innervated by nerve fibers. (voluntary control, generates behavior: cardiac : contracts rhythmically, even in absence of innervation, skeletal : functions to . - each muscle is enclosed in connective tissue sheath forming tendons at the ends of muscles. = muscles that pull a joint in opposite directions. *only lower motor neurons directly command muscle contraction. Axons of l. m. n bundle to form ventral roots. Directly trigger the generation of force by muscles. Mixed spinal nerves b/c sensory & motor fibers. Muscle spindle ; info about muscle length: upper motor neurons in motor cortex and brainstem- -initiation of voluntary movements. How cns controls muscle contraction: varying the firing rate of motor neurons, an alpha m. n. communicates w a muscle fiber by releasing . Ap can cause epsp in muscle fiber large enough to trigger 1 postsynaptic potential.

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