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Muscle Actions

Terms

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Temporalis
elevates mandible
Digastric: Anterior Belly
depresses mandible and/or elevates larynx
Digastric: Posterior Belly
depresses mandible and/or elevates larynx
Mylohyoid
elevates floor of mouth, elevates hyoid bone,and/or depresses mandible
Sternohyoid
depresses hyoid bone and larynx
Sternocleidomastoid
together flex neck, alone bend side to side
Splenius (capitis & cervicis)
together extend neck, alone rotates & flexes neck side to side
Spinalis Thoracis
extends vertebral column
Scalenes
elevates ribs, flexes neck, rotates and bends neck
External Intercostals
elevates ribs
Internal Intercostals
depresses ribs
Diaphragm
contraction expands thoracic cavity, compresses abdominopelvic cavity
External Oblique
compresses abdomen; depresses ribs; laterally flexes or rotates vertebral column
Internal Oblique
compresses abdomen; depresses ribs; laterally flexes or rotates vertebral column
Transverse Abdominis
compresses abdomen
Rectus Abdominis
depresses ribs, flexes vertebral column, compresses abdomen
Trapezius
elevate, retract, depress, or rotate scapula upward and/or elevate clavicle; extend neck
Rhomboideus Minor
adducts & performs downward rotation of scapula
Rhomboideus Major
adducts and downward rotation of scapula
Levator Scapulae
elevates scapula
Serratus Anterior
protracts shoulder: rotates scapula so glenoid cavity moves superiorly (upward rotation)
Pectoralis Minor
depresses & protracts shoulder, rotates scapula (glenoid cavity rotates downward), elevates ribs
Supraspinatus
abduction of arm at the shoulder
Infraspinatus
lateral rotation of arm at shoulder
Deltoid
abducts shoulder, flexion and extension, medial and lateral rotation of humerus
Teres Minor
lateral rotation of arm at shoulder
Teres Major
extension, adduction & medial rotation of arm at shoulder
Subscapularis
medial rotation of arm at shoulder
Pectoralis Major
flexion, adduction & medial rotation of arm at shoulder
Latissimus Dorsi
extension, adduction, and medial rotation of arm at shoulder
Coracobrachialis
adduction and flexion of arm at shoulder
Triceps Brachii
extension at elbow, extension & adduction of arm at shoulder
Brachialis
flexion at elbow
Brachioradialis
flexion at elbow
Pronator Teres
pronates forearm and hand by medial rotation of radius at radioulnar joints & flexion at elbow
Flexor Carpi Radialis
flexion and abduction of hand at wrist
Flexor Carpi Ulnaris
flexion and adduction of hand at wrist
Extensor Carpi Ulnaris
extension and adduction of hand at wrist
Extensor Carpi Radialis Brevis
extension and abduction of hand at wrist
Extensor Carpi Radialis Longus
extension an abduction of hand at wrist
Supinator
supinates forearm and hand by lateral rotation of radius at radioulnar joints
Biceps Brachii
flexion of forearm at elbow and shoulder; supination
Palmaris Longus
flexion of hand at wrist
Extensor Digitorum
extension of hand and fingers at finger joints and wrist
Iliacus
Flexion of thigh at hip
Psoas Major
Flexion of thigh at hip and/or lumbar intervertebral joints
Pectineus
Flexion, medial rotation, and adduction of thigh at hip
Adductor longus
Adduction, flexion, and medial rotation of thigh at hip
Adductor magnus
adduction of thigh at hi , flexion & medial rotation of thigh, extension & lateral rotation of thigh
Gracilis
Flexion at knee; adduction and medial rotation of thigh at hip
Sartorius
Flexion at knee; flexion and lateral rotation of thigh at hip
Rectus femoris
Extension of lower leg at knee; flexion of thigh at hip
Vastus lateralis
Extension of lower leg at knee
Vastus medialis
Extension of lower leg at knee
Vastus intermedius
Extension of lower leg at knee
Semimembranousus
Flexion at knee; extension and medial rotation of thigh at hip
Semitendinosus
Flexion at knee; extension and medial rotation of thigh at hip
Biceps femoris
Flexion at knee; extension and lateral rotation of thigh at hip
Gluteus maximus
Extension and lateral rotation of thigh at hip; helps stabilize the extended knee
Gluteus medius
Abduction and medial rotation of thigh at hip
Tensor fasciae latae
Flexion and medial rotation of thigh at hip
Gastrocnemius
Plantar flexion at ankle; inversion; flexion at knee
Soleus
Plantar flexion at ankle; postural muscle when standing
Tibialis anterior
Dorsiflexion at ankle; inversion of foot
Peroneus longus (aka Fibularis longus)
Eversion of foot and plantar flexion at ankle; supports ankle; supports longitudinal arch
Extensor digitorum longus
Extension of toes; dorsiflexes ankle; everts foot
Masseter

elevates mandible
Temporalis

Temporalis
elevates mandible

Deck Info

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