Motor Endings Somatic motor fiber terminals that innervate voluntary muscles form neuromuscular junctions with their effector cells. The motor endings of autonomic motor neurons form much simpler junctions with smooth and cardiac muscle and visceral glands. The axons branch repeatedly, each branch forming synapses with its effector cells. The axonal ending serving smooth muscle or glands (not cardiac) exhibit a series of varicosities, that make it look like a string of beads. Cranial Nerves Twelve pairs of cranial nerves are associated with the brain and pass through various foramina of the skull. The first two pair originate from the forebrain; the rest originate from the brain stem. The cranial nerves serve only head and neck structures, except the vagus nerve which serves abdominal and thoracic structures. The names usually reveal the most important structures they serve or their primary function. Most are mixed nerves; however, three pair (olfactory, optic, and vestibulocochlear) axe
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This note was uploaded on 11/22/2011 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.