Notes on Muscle Tissue

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Endomysium: surrounds individual muscle fibers.
Perimysium: surrounds groups of muscles.
Epimysium: surrounds entire muscle.

Sacromere structure:
• Thin filaments contain actin, tropomyosin, troponin.
• Thick filaments contain myosin.

• I bands composed of thin filaments; variable length.
• A bands composed of thik and thin filaments; constant length.
• H bands composed of thick filaments; variable length.

Additional Notes:
• Cardiac tissue: fascia adherens; intercalated discs – Z-line.
• Myoglobin: red.
• Triad of skeletal muscle: A-I band junction of sarcomeres.
• White fibers: less mitochondria; less myoglobin; less cytochrome s; increased innervation.
• Smooth muscle: corkscrew-shaped nucleus.

muscle bands I A Z disc M line

Additional Reading:

Histology and Cytology

1. Cell Components
2. Nervous Tissue
3. Muscle Tissue
4. Lymphoid Tissue
5. Integument
6. Respiratory System
7. Gastrointestinal System
8. Renal/Urinary System
9. Male Reproductive System
10. Female Reproductive System

Gross Anatomy

1. Back and Nervous System
2. Thorax
3. Abdomen, Pelvis, and Perineum
4. Upper Limb
5. Lower Limb
6. Head and Neck
7. Chest Wall
8. Shoulder

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