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Lecture 22

BIOL 240 Lecture 22: MARCH 26

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BIOL 240

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MARCH 26 , 2018 Peripheral Motor Endings - Innervation of skeletal muscle o Motor axons innervate skeletal muscle fibers at neuromuscular junctions = motor end plates Only place where there will be neurotransmitters Only in areas of contact - Innervation of visceral muscles and glands o Smooth muscle Innervation of visceral muscles and glands - Wider synaptic clefts - Smooth muscle has neurotransmitter receptors everywhere - Action slow o Neurotransmitters diffuse Cranial Nerves - 12 pairs of nerves branching out from the brain o First two to forebrain o Others to brain stem o Carrying either sensory or motor - All except vagus n. (which extends to abdomen) innervate head and neck Numbering the nerves - In classic anatomy we use roman numerals to number the cranial nerves o I =1 o II = 2 o III = 3 o IV = 4 o V = 5 Cranial nerves can carry - Primarily sensory information - Primarily motor information - Both, sensory and motor information o Mixed nerves - They can also carry visceral sensory and visceral motor fibers
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