Skeletal muscle anatomy

Front

What is the epimysium?

Back

The epimysium is the outermost layer of connective tissue that surrounds an entire muscle, providing structure and support.

Front

What is the perimysium?

Back

The perimysium is the connective tissue that surrounds bundles of muscle fibers, known as fascicles, within a muscle.

Front

What is the endomysium?

Back

The endomysium is the thin layer of connective tissue that surrounds each individual muscle fiber (cell) within a fascicle.

Front

What is the sarcolemma?

Back

The sarcolemma is the cell membrane of a muscle fiber, which plays a crucial role in muscle contraction.

Front

What are myofibrils?

Back

Myofibrils are long, thread-like structures within muscle fibers that contain the contractile proteins actin and myosin.

Front

What is the function of actin in muscle contraction?

Back

Actin is a protein that forms thin filaments in muscle fibers and interacts with myosin to facilitate muscle contraction.

Front

What is the function of myosin in muscle contraction?

Back

Myosin is a protein that forms thick filaments in muscle fibers and interacts with actin to produce muscle contraction.

Front

What is a fascicle?

Back

A fascicle is a bundle of muscle fibers (cells) surrounded by perimysium, which groups them together within a muscle.

Front

What is the bare zone in a sarcomere?

Back

The bare zone is the region in a sarcomere where there is no overlap between actin and myosin filaments, typically found in the center of the sarcomere.

Front

What is sarcoplasm?

Back

Sarcoplasm is the cytoplasm of a muscle fiber, containing various organelles and substances necessary for muscle function.