Anatomy and Cell Biology 3319 Lecture : Anatomy Notes
20 Feb 2012
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Organization of the nervous system: the cns sends and receives info to and from the pns. The pns contains the cranial nerves and spinal nerves. The pns is divided into the sensory (afferent) division and the motor (efferent) division. The motor division is divided into somatic motor and visceral motor or ans. The ans is divided into the sympathetic and parasympathetic divisions. Function of the ans: stability of the body s internal environment. It is the general visceral motor division of the pns and innervates smooth muscle, cardiac muscle, and glands. Maintains optimal visceral function heart rate, blood pressure, respiration rate, digestion, micturition, sexual function. Divisions of the ans: sympathetic vs parasympathetic functional differences are fight-or-flight vs rest-and-digest. Anatomical differences are cns origin, length of fibres, and fibre branching. Sympathetic postganglionic axons release norepinephrine (these fibres are called adrenergic). Parasympathetic postganglionic axons release acetylcholine (these fibres are called cholinergic).
