CDIS 4213 Lecture Notes - Lecture 3: Epimysium, Myocyte, Peripheral Nervous System
25 Aug 2016
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Document Summary
Muscle tissue - responsible for performing movement; accounts for approx. Most muscles discussed in the course are. All are paired except diaphragm and procerus (muscle between eyebrows) Muscle cell (aka muscle fiber) long and. Individual muscle cells surrounded by tissue (endomysium) striated cylinder delicate. Bundled into fascicles (groups of muscle cells), and surrounded by stronger tissue sheath (perimysium) Bundles (fascicles) packaged into even stronger tissue sheath (epimysium) Voluntary muscle controlled by nerves in somatic division of peripheral nervous system. Operated by somatic motor neurons: smooth muscle. Found in blood vessels, esophagus, branchial tubes, stomach, intestines. Slow rhythmic contractions for moving food along esophagus, constricting blood vessel walls during vasoconstriction, etc. During contraction, electrical signal causes wave like reaction: cardiac muscle over muscle. Striated like skeletal muscle, and involuntary like smooth muscle. Muscle contraction: based on the process of action potential. Muscles may or may not change in length during contraction.
