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Glossary of Actions of Muscles

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orbicularis oris
compresses, purses lips
orbicularis oculi
closes eye
masseter
elevates mandible and closes jaw
trapezius
elevate, retract, depress, or rotate upward of the scapula
sternocleidomastoid
together they flex the neck. alone: one side bends neck toward shoulder and turns face to opposide side
deltoid
abduction of the shoulder
pectoralis major
flexion, adduction, medial rotation at shoulder
external intercostals
elevate ribs
internal intercostals
depress ribs
latissimus dorsi
extension, adduction, medial rotation at shoulder
biceps brachii
flexion of elbow
triceps brachii
extension of elbow
pronator teres
pronates forearm and hand by medial rotation of radius at radioulnar joint
supinator
supinates forearm and hand by lateral rotation of radius at radioulnar joint
external oblique
compresses abdomen, depresses ribs, flexes or rotates vertebral column to the opposide side
internal oblique
compresses abdomen, depresses ribs, flexes or rotates vertebral column to the same side
rectus abdominis
compresses abdomen, depresses ribs, flexes vertebral column
transverse abdominis
compresses abdomen
gluteus maximus
extension and lateral rotation at the hip
gluteus medius
abduction and medial rotation at the hip
tensor fascia latae
flexion and medial rotation at the hip
hamstring
flexion at the knee, extension at the hip
quadriceps
extension at the knee, flexion at the hip
sartorius
flexion at knee, flexion and lateral rotation at hip
gracilis
adduction and medial rotation at hip
adductor longus
adduction and medial rotation at hip
gastrocnemius
plantarflexion
tibialis anterior
dorsiflexion

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