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Download Criteria for Naming Muscles
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Criteria for Naming Muscles I. Directions of Muscle fibers (orientation relative to the midline of the body) Rectus Muscle fibers that run parallel to the midline of the body Oblique the body Muscle fibers that are on a slant (diagonal) to the midline of Transverse Muscle fibers that run perpendicular to the midline of the body II. Relative size of the muscle Maximus Muscle size – Largest Medius Muscle size - Middle Minimus Muscle size – Small Longus Muscle size – Long III. Location of the muscle Temporalis Muscle that overlies the temporal bone Frontalis Muscle that overlies the frontal bone IV. Number of Origins Biceps Two origins Triceps Three origins Quadriceps Four origins V. Location of the Muscle Origin & Insertion Sternohyoid Originates on the sternum; inserts on the hyoid bone VI. Shape of the Muscle Deltoid Triangular Orbicularis Circular Platysma Flat VII. Action of the Muscle Flexor Decreases joint angle Extensor Increases joint angle Abductor Moves bone away from the midline Adductor Moves bone close to the midline Levator Elevates Depressor Depresses Supinator Turns palm superiorly or anteriorly Pronator Turns palm inferiorly or posteriorly Sphincter Decreases the size of an opening Tensor Makes a body part rigid Rotator Moves bone around a longitudinal axis
