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66 terms

Muscle Actions

bio 260 at swcc
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Obicularis Oris
close and protrudes lips
Obicularis Oculi
blinking,squinting,forceful closing of eyes
Platysma
tenses skin of neck, depresses mandible
Masseter
elevates mandible
Temporalis
elevates and retracts mandible
Frontalis
raises the eyebrows,wrinkles forehead skin
Sternocleidomastoid
both:flex cervical vertebral column
alone:rotates head to the opposite sides
Splenius Capitis
extend the neck
Trapezius
Elevates, depresses,rotates, adducts scapula
Biceps Brachii
flexes elbow and supinates forearm
Brachialis
flexes forearm at elbow
Brachioradialis
flexes forearm and elbow
Triceps Brachii
extend the elbow and adduct shoulder
Pronator teres
pronates forearm
Supinator
supinates forearm
Flexor carpi ulnaris
flexes and ADducts hand/wrist
Flexor carpi radialis
flexes and ABducts hand/wrist
Extensor carpi ulnaris
extend and ADducts hand/wrist
Extensor carpi radialis (longus,brevis)
extend and ABduct hand/wrist
Palmaris Longus
flexes the hand/wrist
Extensor Digitorum Communis
extend finger joints and wrist
Coracobrachialis
flexes and adducts the shoulder
Pectoralis Major
flexes,ADducts and medially rotates shoulder
Pectoralis Minor
depresses and pulls scapula anteriorly
Serratus Anterior
draws scapula forward along thoracic wall,rotates scapula
Iliopsoas
flexes hips
Rectus Abdominis
flexes vertebral column, compresses abdominal contents
External/Internal Abdominal Oblique
compresses abdominal contents, assist in flexion and rotation of vertebral column
Transverse Abdominis
compresses abdomen
Quadratum lumborum
depresses ribs
Errector spinae group
extend neck(cervicis) and extend vertebral column(thoracis)
External Intercostalis
elevate and expand rib cage
Internal Intercostalis
depress rib cage
Xiphihumeralis
adducts and rotates the forelimb
Lavator Scapula
elevates scapula
Rhomboid Major and Minor
ADducts and rotates scapula
Deltoid
ABducts;flexes and medially rotates;extend and laterally rotates arm
Supraspinatus
arm abduction
Infraspinatus
laterally rotates shoulder/arm
Subscapularis
medially rotates shoulder/arm
Lattisimus Dorsi
extend,ADducts, and medially rotates shoulder
Teres Major
adducts,extends and medially rotates arm
Teres Minor
laterally rotates arm
Tensor Fascia latae
laterally support the knee; abduct and medially rotates the hips
Sartorius
flexes and laterally rotates thigh;flexes and medially rotates leg at the knee
Rectus Femoris
extend the knee and flexes the hips (one of quadtriceps femoris)
Vastus Lateralis/Medialis/intermedius
(quadtriceps femoris with Rectus femoris)
extend the knee and flexes hips
Gracilis
Adducts thigh at hip; flexes leg at knee
Semitendinosus/Semimembranosus
flexes the knee; extend and medially rotates the hip
Adductor longus/brevis
adducts and flexes the hip
Adductor magnus
whole muscle produce adduction of the hip
Pectineus
flexes and adducts thigh
Biceps femoris
Extend and laterally rotates the hip
Gluteus Maximus
extend and laterally rotates hip
Gleuteus medius
ABducts thigh at hip
Popliteus
medially rotates tibia
Tibialis Anterior
dorsiflexes and inverts the foot;extend toes
Tibialis Posterior
plantar flexes and inverts foot
Extensor hallucis longus
dorsiflexes foot,extends the joints of big toe
Extensor digitorum longus
dorsiflexes foot and extend toes
Flexor hallucis Longus
plantar flexes and inverts foot; flexes great toe
Flexor digitorum longus
plantar flexes and inverts foot; flexes great toe
Gastrocnemius
plantar flexes the foot, weak flexor of leg at knee
Soleus
plantar flexes the foot
Peroneus(fibularis) longus/brevis
plantar flexes and everts foot
Plantaris
plantar flexion at ankle;flexion at knee