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Muscles and Actions
Match the muscle to its action
27
Anatomy
Undergraduate 2
08/28/2014

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Cards

Term
Piriformis
Definition
External rotator of the thigh
Term
Transversus abdominus
Definition
Compresses abdominal contents
Term
Quadratus laborum
Definition
Alone, lateral flexion of vertebral column; Together, depression of thoracic rib cage
Term
Iliacus
Definition
Flexes and rotates lateral thigh
Term
Psoas
Definition
Flexes and rotates lateral thigh
Term
Puborectalis
Definition
Inhibit defecation
Term
Cremaster muscle
Definition
Raise and lower scrotum
Term
Puborectalis
Definition
Inhibit defecation
Term
Pubococcygeus
Definition
Controls urine flow and contracts during orgasm
Term
Iliococcygeus
Definition
Resistance to increase intrapelvic pressure, post-defecatory elevation of anal canal
Term
Inferior oblique
Definition
Extorsion, elevation, abduction
Term
Superior rectus
Definition
Elevates, intorsion, and rotates medially the eye
Term
Superior oblique
Definition
Primary action is intorsion; secondary actions are to abduct and depress the eyeball
Term
Medial rectus
Definition
Adducts the eyeball
Term
Lateral rectus
Definition
Abducts the eyeball
Term
Levator palpebrae superioris (LPS)
Definition
Retracts/elevates eyelid
Term
Lateral pterygoid
Definition
Depresses mandible, protrude mandible, side to side movement of mandible
Term
Medial pterygoid
Definition
Elevated mandible, closes jaw, helps lateral pterygoid in moving the jaw from side to side
Term
Temporalis
Definition
Its main action is to elevate the mandible, raising the lower jaw. Elevation of the mandible occurs during the closing of the jaws. If only the posterior part contracts, the muscle moves the lower jaw backward
Term
Occipitalis
Definition
Moves scalp backwards
Term
Platysma
Definition
Produces a slight wrinkling of the surface of the skin of the neck in an oblique direction. Its anterior portion, the thickest part of the muscle, depresses the lower jaw; it also serves to draw down the lower lip and angle of the mouth in the expression of melancholy, i.e. grimacing.
Term
Buccinator
Definition
Pulls back the angle of the mouth and to flatten the cheek area, which aids in holding the cheek to the teeth during chewing
Term
Mentalis
Definition
Causes protrusion of the lower lip and elevates the skin of the chin. As the lower lip is raised, it results in elevation and wrinkling of the chin's skin
Term
Zygomaticus major
Definition
Draws the angle of the mouth superiorly and posteriorly (smile)
Term
Orbicularis oris
Definition
Closes the mouth and puckers lips
Term
Orbicularis oculi
Definition
Closes eyelids
Term
Frontalis
Definition
Raises eyebrows and wrinkles forehead as pulls scalp backwards
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