CHAPTER 10 “ Muscle Tissue”. Objectives Describe and identify the 3 major muscle groups (skeletal, cardiac and, smooth). Describe the general anatomy of muscles. Describe the ultra-structure of skeletal muscle and its role in muscle contraction.
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Describe and identify the 3 major muscle groups (skeletal, cardiac and, smooth).
Describe the general anatomy of muscles.
Describe the ultra-structure of skeletal muscle and its role in muscle contraction.
Describe nerve-muscle relationship, the motor unit and the neuromuscular junction.
Define the physiologic fiber types of muscle.
3. Smooth muscle
Origin - point of attachment where least movement occurs.
Insertion – point of attachment with greatest movement.
(f and G actin) also contain the regulatory proteinstropomyosin and troponin.
Ultrastructure of skeletal muscle: multipennate circularsarcomere = distance between 2 “Z” lines.
Every muscle contraction multipennate circular
is preceded by a nerve
impulse from the brain or
spinal cord. The impulse is
transmitted by a motorneuron
to each muscle fiber.
Synaptic knob, terminal or bouton – bulbous swelling at the end of a motor nerve above the motor end plate on the muscle fiber.
- intercalated discs
- uni-nucleate cells