1. Structure of Skeletal Muscle

2. Skeletal muscles….
Control movement of various substances
Allow for voluntary control of functions – urination, defecation, swallowing
Protect internal organs (ex. Abdominals)
Maintain homeostasis by generating heat
Each muscle is an organ that contains various integrated tissues

3. Mysia – connective tissue in skeletal muscle
Epimysium
Allows muscles to contract
Separates muscles from other tissues/organs for independent movement
Perimysium
Encloses the muscle fascicle, a bundle of muscle fibers
Endomysium
Encloses individual muscle cells, also called muscle fibers
Contains fluid and nutrients brought in by blood vessels

5. Muscle cells – “muscle fibers”
Sarcolemma – plasma membrane
Sarcoplasm – cytoplasm
Sarcoplasmic reticulum – specialized endoplasmic reticulum – stores, releases, and receives Ca++ cations
Sarcomere – functional unit of muscle cell made up of myofibrils
Actin – thin filament
Myosin – thick filament
Troponin – regulatory protein
Tropomyosin – regulatory protein

7. Sarcomere – functional unit of the cell

8. Neuromuscular Junction (NMJ)
Where a motor neuron terminal
meets the muscle cell (fiber)
EVERY SKELETAL MUCLE FIBER
(CELL) IN EVERY SKELETAL MUSCLE IS
INERVATED BY A MOTOR NEURON
AT THE NMJ

9. Help! I’m lost and need to review
Anatomy of a Skeletal Muscle by Khan Academy