Chapter 9 & 10 Muscular System 1 Organ 2012

Chapter 9 & 10 Muscular System 1 Organ 2012 -...

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Muscular System I
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Learning Objectives 2 • Compare and contrast the characteristics, function, locations and component structures of the three types of muscle • Describe the microscopic anatomy of skeletal muscle and the hierarchical arrangement of its component structures • Describe the mechanism by which muscle is able to contract • Describe the association between skeletal muscle and connective tissue (i.e. fascia) • Describe the characteristics and component structures of the microscopic anatomy of cardiac and smooth muscle
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Musculus: “Little Mouse”
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4 Muscles what are they good for? •m o v e m e n t •s t a b i l i z a t i o n •p o s t u r e • generating heat
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What’s so special about muscle? tissue? Muscle is contractile cells can contract, generate pulling force Muscle is excitable nerve signals cause electrical impulse in plasma membrane of muscle cell which stimulates contraction Muscle is extensible muscle tissue can be stretched by contraction of opposing muscle Muscle is elastic recoils to original length after being stretched
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6 Types of Muscle 3 types Skeletal – voluntary striated muscle that you consciously control the movement of. That found in all limbs and body walls. Cardiac – involuntary striated muscle, innervated by the autonomic nervous system. Found only in the walls of the heart. Smooth – involuntary, non-striated muscle, innervated by the autonomic nervous system. Found in the walls of blood vessels and hollow internal organs.
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7 Terminology Fascia - fibrous CT (primarily collagen fibers) that surrounds and separates muscles in the body Tendon – a cord-like fascial extension at end of the muscle attaching it to body by the intermingling of collagen fibers with those of the periosteum Aponeurosis – broad, sheet-like arrangement of fascia attaching muscle to muscle or bone Sharpey’s fibers : the collagen fibers of the periosteum that insert into the underlying bone. The collagen fibers of tendons blend with those of the periosteum which in turn blend with Sharpey’s fibers, thus forming a contractile unit
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8 Skeletal Muscle Skeletal Muscle • parallel striated muscle cells (fibers) surrounded and held together by CT fibers, with capillary beds running parallel to fibers • contract in response to acetylcholine ( neurotransmitter) • The striated appearance of this muscle is due to the arrangement of various myofilaments found within the contractile units (sarcomeres) of the muscle.
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9 Sarcomere The smallest functional unit of a skeletal muscle cell, extends from z-line to z-line Z-line sarcomere
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10 Skeletal Muscle Cells • Long, multinucleated, cylindrical cells with peripheral nuclei. Each cell (fiber) contains:
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Chapter 9 & 10 Muscular System 1 Organ 2012 -...

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