Bio210-L_MuscleActions_KnowSheet-Fall24

Orbicularis oculi

Closes eye

Orbicularis oris

Closes lips

Masseter

Closes jaw

Temporalis

Closes jaw

Sternocleidomastoid

Flexes and rotates head

Pectoralis major

Flexes, adducts and medially rotates arm

Trapezius

Elevates, retracts, and depresses scapula

Latissimus dorsi

Extends, adducts, and medially rotates arm

Rectus abdominis

Flexes vertebral column

External oblique

Flexes and rotates vertebral column

Deltoid

Abducts arm

Biceps brachii

Flexes and supinates forearm

Triceps brachii

Extends forearm (lateral, long, and medial heads)

Gluteus maximus

Extends, laterally rotates, and abducts thigh

Rectus femoris

Extends leg and flexes thigh

Vastus lateralis

Extends leg

Vastus intermedius

Extends leg

Vastus medialis

Extends leg

Adductor longus

Adducts, medially rotates, and flexes thigh

Semitendinosus

Extends thigh and flexes leg

Semimembranosus

Extends thigh and flexes leg

Biceps femoris

Extends thigh and flexes leg

Tibialis anterior

Dorsiflexes foot

Gastrocnemius

Plantar flexes foot