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level: Muscle Action and Muscle Names

Questions and Answers List

Question	Answer
Prime mover. A muscle that causes a desired action; contracting	Agonist
A muscle simultaneously relaxing as the agonist is contracting.	Antagonist
Muscle involved in addition to agonists and antagonists, which serve to steady a movement, thus, preventing unwanted movements and helping the prime mover functions more efficiently.	Synergist
Parallel	Rectus
Attached to the temporal bone	Temporalis
Largest	Maximus
Smallest	Minimus
Long	Longus
Short	Brevis
Two origins	Bicep
Three origins	Tricep
Triangular	Deltoid
Rhomboid	Rhomboideus
Origin: scapula Insertion: deltoid ridge of the humerus	Scapulohumeralis
Bends or flexes a part; Decreases the angle at a joint	Flexor
Straightens or extends a part; usually increases the angle of a joint	Extensor
Moves a bone away from the midline or axis of the body	Abductor
Moves a bone closer to the midline	Adductor
Produces an upward or superiorly directed movement	Levator
Produces a downward or inferiorly directed movement	Depressor
Decreases the size of an opening	Sphincter
Increases the size of the opening	Dilator
Moves a bone around its longitudinal axis	Rotator
Rotator that turns a part dorsad or upward	Supinator
Rotator that turns a part ventrad or upward	Pronator
Makes a body part more rigid	Tensor