A&P 1 Lab SONNE Muscles w/ Animation

Orbicularis Oculi

Closes eyes, blinking, squinting

Zygomaticus (minor & major)

Raises lateral corners of mouth (smiling)

Orbicularis Oculi

Closes mouth, purses lips (kissing)

Platysma

Depresses mandible, pulls lower lip back and down

Frontal Belly

Raises eyebrows, wrinkles skin of forehead

Masseter

Closes jaw, elevates mandible

Sternocleidomastoid

Flexes neck (together); rotates head toward opposite shoulder (individually)

Digastric

Elevates hyoid, opens mouth, depresses mandible

Deltoid

Prime mover of arm abduction

Pectoralis Major

Arm flex ion, adducts and medially rotates arm

Serrated Anterior

Moves scapula forward

Trans versus Abdominis

Compresses abdominal contents

Internal Obliques

Flexes vertebral columns, fixes and depresses ribs, stabilizes pelvis when walking, aids in trunk rotation and lateral flexion

External Obliques

Flexes vertebral column, fixes and depresses ribs, stabilizes pelvis when walking, aids in trunk rotation & lateral flexion

Rectus Abdominis

Flexes vertebral column, fixes and depresses ribs, stabilizes pelvis when walking

Trapezius

Extends head, retracts scapula, elevates & depresses scapula (shrugging)

Teres Major

Extends, medially rotates, & adducts humerus

Latissimus Dorsi

Prime mover of arm extension; adducts & medially rotates arm

Supraspinatus

Assists in abduction of humerus; stabilizes shoulder

Infraspinatus

Lateral rotation of humerus

Erector Spinae

Extends & abducts vertebral column

Triceps Brachii

Extension of forearm

Biceps Brachii

Flexion of forearm, supination of forearm

Flexor Carpi Radialis

Wrist flexion, abducts hand

Flexor Carpi Radialis

Wrist flexion, adducts hand

Flexor Digitorum Superficialis

Flexes wrist & phalanges of fingers 2-5

Flexor Pollicis Longus

Flexes thumb

Extensor Carpi Radialis Longus

Extends & abducts wrist

Extensor Digitorum

Finger extension

Iliopsoas

Flex trunk on thigh, hip flexor

Tensor Fasciae Latae

Abducts & medially rotates

Sartorius

Flexes & medially rotates thigh (cross-legged sitting)

Rectus Femoris

Extends knee & flexes thigh a hip

Vastus Lateralis & Medialis

Extends knee

Adductor Longus

Adducts & medially rotates and flexes thigh

Gracilis

Adducts thigh & medially rotates leg

Gluteus Maximus

Hip extensor, laterally rotates thigh

Biceps Femoris

Extends thigh, flexes knee, laterally rotates leg

Semitendinosus

Extends thigh, flexes knee, medially rotates leg

Semimembranosus

Extends thigh, flexes knee, medially rotates leg

Gastrocnemius

Flexion of knee when foot is dorsiflexed

Soleus

Plantarflexion of foot

Popliteus

Flexes & medially rotates leg

Flexor Digitorum Longus

Flexes toes; plantarflexes & inverts foot

Fibularis Longus

Plantarflexes & everts foot

Flexor Hallucis Longus

Flexes great toe; pushes off when walking

Tibialis Posterior

Inversion & plantarflexion of foot

Tibialis Anterior

Dorsiflexes & inverts foot

Extensor Digitorum Longus

Toe extension; doesiflexes & everts foot

Extensor Hallucis Longus

Extends great toe