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Efferent and Peripheral Nervous Divisions: Autonomic and Somatic Motor Systems

This article explores the efferent and peripheral nervous divisions, specifically focusing on the autonomic motor system which innervates cardiac muscle, smooth muscle, endocrine tissue, and adipocytes, as well as the somatic motor system which innervates skeletal striated muscle. The role of neurotransmitters and receptors in these systems is also discussed.

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Efferent and Peripheral Nervous Divisions: Autonomic and Somatic Motor Systems

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  1. Efferent Peripheral Nervous Divisions cont. Autonomic Motor - innervates cardiac muscle, smooth muscle, endocrine tissue and adipocytes Somatic Motor- innervates skeletal striated muscle • Neurotransmitters and receptors

  2. Human Physiology, 6th ed., Fox, SI; WC Brown, Fig.9.9

  3. Somatic Motor • Acetylcholine (ACh) acts on muscle nicotinic ACh receptors • Excitatory, causes muscle contraction

  4. Somatic Motor Nervous System • Cell bodies in CNS • Send single axons to skeletal muscles • Excitatory, causes muscle contraction • Acetylcholine (ACh) acts on nicotinic ACh receptors

  5. Muscles are innervated by nerves that originate in the brainstem or spinal cord and end at the neuromuscular junction with typically one junction per muscle fiber.

  6. Motor efferent pathways

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