Chapter 11 Muscle Assignments

Flashcards for Chapter 11 Muscle Assignments

Frontalis

Raises eyebrow, wrinkles forehead

Orbicularis oris

Closes & protrudes lips

Zygomaticus major

Elevates mouth corner

Orbicularis oculi

Closes eye

Masseter

Elevates mandible

Temporalis

Elevates mandible

Sternocleidomastoid

Together: flex neck, singly: rotates head to opposite side

Rectus abdominis

Compresses abdomen, flexes vertebral column

External oblique

Together: compress abdomen & flex vertebral column, singly: rotates vertebral column

Erector spinae

Extends vertebral column

Diaphragm

Increases size of thoracic cavity for inspiration

External intercostals

Elevates ribs for inspiration

Internal intercostals

Depresses ribs for forced expiration

Pectoralis minor

Pulls scapula anteriorly & downward

Serratus anterior

Pulls scapula anteriorly

Trapezius

Elevates, depresses, & adducts scapula, extends neck

Pectoralis major

Flexes & adducts arm at shoulder

Latissimus dorsi

Extends & adducts arm at shoulder, depresses shoulder

Deltoid

Flexes, extends, & abducts arm at shoulder

Teres major

Extends & adducts arm at shoulder

Supraspinatus

Works with deltoid to abduct arm; prevents slippage of humeral head

Infraspinatus

Externally rotates humerus; stabilizes shoulder

Teres minor

Externally rotates humerus; prevents upward slippage of humeral head when deltoid abducts arm

Subscapularis

Internally rotates/adducts humerus; prevents forward displacement of humerus

Biceps brachii

Flexes forearm at elbow; strongest when used in the supinated position

Brachialis

Flexes forearm at elbow; strongest when used in the fully pronated (“reverse grip”) position

Brachioradialis

Flexes forearm at elbow; strongest when used halfway between pronation & supination (“hammer grip”)

Triceps brachii

Extends forearm at elbow

Pronator teres

Pronates forearm

Supinator

Supinates forearm

Flexor carpi radialis

Flexes & abducts hand at wrist

Flexor carpi ulnaris

Flexes & adducts hand at wrist

Extensor digitorum

Extends fingers

Extensor carpi radialis longus

Extends & abducts hand at wrist

Extensor carpi ulnaris

Extends & adducts hand at wrist

Iliopsoas

Flexes hip, flexes vertebral column

Iliacus

Flexes hip, flexes vertebral column

Gluteus maximus

Extends hip

Gluteus medius

Abducts hip

Tensor fasciae latae

Maintains balance of pelvis when walking, weakly abducts thigh/flexes leg, stabilizes hip and knee joint

Adductor longus

Flexes & adducts hip

Gracilis

Adducts hip, flexes knee

Rectus femoris

Flexes hip, extends knee

Vastus lateralis

Extends knee

Vastus medialis

Extends knee

Vastus intermedius

Extends knee

Sartorius

Flexes hip & knee, laterally rotates hip

Biceps femoris

Extends hip, flexes knee

Semitendinosus

Extends hip, flexes knee

Semimembranosus

Extends hip, flexes knee

Tibialis anterior

Dorsiflexion & inversion of foot at ankle

Gastrocnemius

Flexion of knee, plantar flexion of foot at ankle

Soleus

Powerful plantar flexion of foot at ankle