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Muscles – Trunk, Head, Neck page 1 of 4 ANAT 11110 Lab 8 Fall 2011 The Muscular System Trunk, Head, and Neck Station 1: Muscle Tissue Muscle cells are specialized for contraction. Muscle cells tend to be quite elongated. There are three distinct types of muscle tissue: skeletal, smooth, and cardiac. Skeletal muscle cells are long, cylindrical, and multi-nucleated (i.e., have more than one nucleus). Skeletal muscle is also distinctive because the cells are striated, meaning that they appear striped from side-to-side. Smooth muscle is so called because it lacks striations; smooth muscle is also called visceral muscle, because it is found in the hollow organs of the viscera. Smooth muscle cells tend to be shorter and spindle-shaped (aka, fusiform). You may have noticed some of these cells underlying the pseudostratified columnar epithelial tissue looked at in the tissue lab. Cardiac muscle cells are similar to skeletal muscle in that they are striated. Each cell, however, contains only a single, centrally-placed nucleus. Adjacent cells are joined together by special junctions called ‘intercalated discs’ , and individual fibers tend to be branched, such that the interconnected fibers form a complex network. Observe the slides of muscle tissue. In the spaces below, draw diagrams of skeletal, smooth, and cardiac muscle tissue. skeletal muscle smooth muscle cardiac muscle Station 2: Lever Systems The primary function of skeletal muscles is to move the bones of the skeleton. The bones serve as levers , which move around a pivot point, called the fulcrum . In the body, the various synovial joints act as fulcrums. There are three different types of
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This note was uploaded on 01/03/2012 for the course ANAT 11110 taught by Professor Manley-buser during the Fall '11 term at Palmer Chiropractic.

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muscles_trunk-lab - Muscles Trunk, Head, Neck page 1 of 4...

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