A&P1 lab test 2 practice

Orbicularis oculi

Closes eyes, blinking, squinting

Zygomaticus minor and major

Raises lateral corners of mouth, smiling

Platysma

Depresses mandible, pulls lower lip back and down

Frontal belly of epicranius

Raises eyebrows, wrinkles skin of forehead

Masseter

Closes jaw, elevates mandible

Sternocleidomastoid

Flexes neck (together), rotates head towards opposite shoulder (individually)

Transversus abdominis

Compresses abdominal contents

Internal obliques

flexes vertebral column, fixes and depresses ribs, stabilizes pelvis while walking, aids in trunk rotation and lateral flexion

External obliques

flexes vertebral column, fixes and depresses ribs, stabilizes pelvis while walking, aids in trunk rotation and lateral flexion

Rectus abdominis

flexes vertebral column, fixes and depresses ribs, stabilizes pelvis while walking

Orbicularis oris

Closes mouth, purses lips (kissing)

Serratus anterior

Moves scapula forward

Deltoid

Prime mover of arm abduction

Pectoralis major

arm flexion, adducts and medially rotates arm

lliopsoas

flex trunk on thigh, hip flexor

Tensor fasciae latae

flexes, abducts, and medially rotates thigh

Sartorius

flexes and laterally rotates thigh (cross-legged sitting)

Rectus femoris

Extends knee and flexes thigh at hip

Vastus medialis

Extends knee

Vastus lateralis

Extends knee

Adductor longus

Adducts and medially rotates and flexes thigh

Gracilis

Adducts thigh and 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

Semimembranous

Extends thigh, flexes knee, medially rotates leg

Gastrocnemius

Flexion of knee when foot is dorsiflexed

Soleus

Plantarflexion of foot

Flexor digitorum longus

Flexes toes; plantarflexes and inverts foot

Popliteus

Flexes and medially rotates leg

Fibularis longus

Plantarflexes and everts foot

Flexor hallucis longus

Flexes great toe; pushes off when walking

Tibialis posterior

Inversion and plantarflexion of foot

Tibialis anterior

Dorsiflexes and inverts foot

Extensor digitorum longus

Toe extension; dorsiflexes and everts foot

Extensor hallucis longus

Extends great toe

Trapizius

Shrug shoulders

Teres major

Extends, medially rotates, and adducts humerus

Latissimus dorsi

Prime mover of arm extension; adducts and medially rotates arm

Supraspinatus

Assists in abduction of humerus; stabilizes shoulder

Infraspinatus

Lateral rotation of humerus

Triceps brachil

Extension of forearm

Biceps brachii

Flexion of forearm, supination of forearm

Flexor carpi radialis

Wrist flexion, abducts hand

Flexor carpi ulnaris

Wrist flexion, adducts hand

Flexor digitorum superficialis

Flexes wrist and phalanges of fingers 2-5

Flexor pollicis longus

Flexes thumb

Extensor carpi ulnaris

Extends and adducts wrist

Extensor carpi radialis longus

Extends and abducts wrist

Extensor digitorum

Finger extension

Extensor pollicis longus

Extends thumb