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Anatomy 271 > Actions of Muscles > Flashcards

Actions of Muscles Flashcards

1
Q

Trapezius (A)

A

Rotate, elevate, retract, and depress scapula

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2
Q

Latissimus dorsi (A)

A

Agonist of arm extension; adducts and medially rotates arm

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3
Q

Deltoid (A)

A

AF: Flex & medially rotate arm
MF: Agonist of arm abduction
PF: Extend and laterally rotate arm

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4
Q

Pectoralis Major (A)

A

Agonist of arm flexion
Also, adducts (horizontally) and medially rotate arm

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5
Q

Biceps brachii (A)

A

Flexes forearm, powerful supinator of forearm
Long head flexes arm

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6
Q

Psoas Major (A)
Iliacus (A)

A

Flexes thigh

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7
Q

Gluteus Maximus (A)

A

Extends thigh; laterally rotates thigh

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8
Q

Rectus Femoris (A)

A

Flexes thigh, extends leg

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9
Q

Tibialis Anterior (A)

A

Dorsiflexes foot; inverts foot

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10
Q

Gastrocnemius (A)

A

Flexes leg; plantar flexes foot

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11
Q

Frontal Belly of Occipitofrontalis (A)

A

Moves scalp, eyebrows; wrinkles skin of forehead

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12
Q

Orbicularis Oculi (A)

A

Close eyes; produces winking, blinking, squinting

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13
Q

Depressor Anguli Oris (A)

A

Draws corners of mouth inferiorly and laterally (“frown” muscle)

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14
Q

Zygomaticus Major (A)

A

Elevates corner of the major

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15
Q

Masseter (A)

A

Elevates and protracts mandible; prime mover of jaw closure

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16
Q

Sternocleidomastoid (A)

A

Unilateral action: lateral flexion, rotation of the head to the opposite side
Bilateral action: flexes neck

17
Q

Splenius Capitis (A)

A

Unilateral action: turns head to same side
Bilateral action: Extends head/neck

18
Q

Diaphragm

A

The contraction causes flattening of the diaphragm (moves inferiorly), thus expanding of thoracic cavity; increases pressure in the abdominopelvic cavity

19
Q

External Oblique

A

Unilateral action: Lateral flexion of the vertebral column; rotation of vertebral column to the opposite side
Bilateral Action: Flexes vertebral column and compresses abdominal wall; used in forced exhalation

20
Q

Rectus Abdominis

A

Flexes vertebral column; compresses abdominal wall; used in forced exhalation

Anatomy 271 (2 decks)

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