Interactions of Skeletal Muscle and Fascicle Organization

Flashcards covering key vocabulary and concepts from lecture notes on skeletal muscle interactions and fascicle organization.

Origin

The fixed attachment of a muscle.

Insertion

The end of a muscle attached to the bone or body part that moves during contraction.

Agonist

The main mover of a joint.

Antagonist

The muscle that opposes the agonist and returns the joint to its original position.

Synergist

A muscle that helps another muscle do its action.

Fixator

A muscle that stabilizes a joint while another muscle performs its action.

Tremor

A condition where both agonist and antagonist muscles receive signals to contract simultaneously, leading to conflict.

Fascicle Organization

The arrangement pattern of muscle fibers within a muscle.

Parallel-Fusiform

Muscle fibers run parallel, and contraction enlarges the middle.

Circular

Muscles that act as sphincters, making an opening smaller upon contraction.

Pennate

Muscle fibers arranged like feathers, with subtypes including unipennate, bipennate, and multipennate.

Naming of Muscle

Muscles can be named based on location, attachments, action, shape, size, or number of origins.

Abductor

A muscle that moves a limb or part away from the midline of the body.

Adductor

A muscle that moves a limb or part toward the midline of the body.

Latin Roots

Word components derived from Latin that describe muscle actions or characteristics.