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BMS 301 (47)

Nervous system, autonomic nervous system (ANS), sympathetic, parasympathetic

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Colorado State University
Biomedical Science
BMS 301
Mark Frasier

8 October CNS Brain and spinal cord PNS Cranial nerves (from brain), spinal nerves (from spinal cord) Cranial nerves have special sense, spinal nerves do not Cranial and spinal nerves have somatic and autonomic functions ANS (autonomic nervous system) Involuntary, unconscious Controls smooth muscle (gut, blood vessels) Controls cardiac muscle Controls glandular tissue Motor system (visceral efferent) Sensory input Somatic afferents Visceral afferents (not consciously perceived) Eg: CO receptors, acid receptors, water balance, blood sugar, blood 2 pressure Sent to hypothalamus (part of brainstem) Visceral afferents are dull, unlocalized Always painful Either ischemia, cramping, or distension ANS Sympathetic (energy consuming, fight or flight, fast, widespread) Parasympathetic (energy conserving, rest and relaxation, digestion, relatively slow, localized) Spinal nerves carry sympathetic nerve fibers Cranial nerves carry parasympathetic nerve fibers Most viscera (organs) have dual innervation, both sympathetic and parasympathetic Body wall and limbs only have
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