NROC69H3 Lecture : Chapter 11.docx
22 Apr 2012
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Smooth muscle: lines the digestive tract, arteries, and related structures and is innervated by nerve fibers from the autonomic nervous system, plays a role in peristalsis and the control of blood pressure and blood flow. Cardiac muscle: heart muscle, contracts rhythmically even in the absence of any innervations, innervations from ans functions to accelerate or slow down heart rate. Skeletal muscle: functions to move bones around joints, move eyes, control respiration, facial expression and produce speech. Each skeletal muscle enclosed in a connective tissue sheath that at the ends of the muscle, forms the tendons. Within each muscle are hundreds of muscle fibers : the cells of skeletal muscle each muscle fiber is innervated by a single axon branch from the cns. Skeletal muscle is derived embryologically from 33 paired somites, these muscles, and the parts of the nervous system that control them, are collectively called the somatic motor system under voluntary control.
