Lab+04+Legs+and+MM+Histo

Lab+04+Legs+and+MM+Histo - Lab 4 Part 1: Muscle histology...

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Lab 4 Part 1: Muscle histology Part 2: Bones of the pelvis, thigh, & leg Part 3: Muscles of the hip, thigh, & leg
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Functions of Muscles / Muscle Tissue Movement (of bones, viscera, food, blood) Maintaining posture Stabilizing joints Generating heat
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Features of Muscle Tissue Mesodermal embryonic origin (primarily) Vascular Contractile Muscle cells generate pulling forces when they contract (muscles only pull, they never push!) Excitable Nerve signals (primarily) excite muscle cells, causing them to contract
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Special Names for Muscle Cell Organelles Plasma membrane = sarcolemma Cytoplasm = sarcoplasm Mitochondria = sarcosomes ER = sarcoplasmic reticulum Contractile unit = sarcomere
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Types of Muscle Tissue Skeletal Cardiac Smooth
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Skeletal Muscle Muscle Attachments Most muscles cross at least one movable joint Have origins and insertions Muscles attach to the periosteum of bone via short strands of CT, tendons or aponeuroses Subject to voluntary control (and involuntary control)
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Skeletal Muscle Tissue 1. Nuclei lie at the periphery 2. Individual cells are - Long and cylindrical - Multinucleated - Parallel in orientation 3. Tissue is striated due to arrangement of organelles and structural proteins
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MM 4.14a Cells: long, cylindrical, parallel, striated. Nuclei: multiple, peripheral, small, dark, sometimes stretched out.
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Skeletal muscle fibers Striations not always easy to see. Look closely! And look at other features too.
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One skeletal muscle fiber! Multiple nuclei occur at the periphery of the cell } Striations
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Muscle Organization Muscle cell = muscle fiber Group of muscle cells = fascicle Group of fascicles = muscle
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Organization of Skeletal Muscle CT sheaths surround muscle tissue at multiple levels: Endomysium : a fine sheath of CT (rich in reticulin) that surrounds individual muscle cells/fibers Perimysium : a layer of fibrous CT surrounding fascicles Epimysium : outer layer of dense irregular CT surrounding an entire muscle
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Organization of Skeletal Muscle MM 10.1
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Skeletal muscle in cross-section BV PeriM EpiM
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Lab+04+Legs+and+MM+Histo - Lab 4 Part 1: Muscle histology...

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