Muscle Functions

Occipitofrontalis

raises eyebrows

Orbicularis Oculi

closes eyes

Orbicularis oris

closes lips; kissing + speech

Masseter

elevates mandible

temporalis

elevates + retracts mandible

sternocleidomastoid

rotate head + flex cervical vertebrae

platysma

depresses mandible

rectus abdominis

compresses abdomen + flex vertebral column

external oblique

rotate to opposite side

internal oblique

rotate to same side

transversus abdominis

compress abdomen

pectoralis minor

abducts scapula + rotates it downward

serratus anterior

abducts scapula + rotates it upward

trapezius

elevates the shoulder joint + adducts the scapula

levator scapulae

elevates scapula

rhomboid major

adducts + elevates + stabilizes scapula

rhomboid minor

adducts + elevates + stabilizes scapula

pectoralis major

adducts + medially rotates arm at shoulder joint

Latissimus dorsi

draws arm inferiorly + posteriorly

Deltoid

shoulder abduction, flexion, extension

supraspinatus

shoulder abduction

infraspinatus

laterally rotates arm at shoulder joint

teres major

extends, adducts, medially rotates arm at shoulder joint

teres minor

rotates the shoulder joint laterally

biceps brachii

flexes the elbow

coracobrachialis

flexes + adducts arm at shoulder joint

brachialis

flexes the elbow

brachioradialis

flexes the elbow + helps to return hand to neutral position after supination or pronation

triceps brachii

extends the elbow

pronator teres

proximal pronator

supinator

turns palm anteriorly

flexor carpi radialis

flexes hand at wrist joint

flexor carpi ulnaris

flexes hand at wrist joint

extensor digitorum

extends phalanges

gluteus maximus

extends thigh at hip joint + laterally rotate thigh

gluteus medius

abducts the hip

Iliacus

flex thigh at hip joint + laterally rotate thigh

Posas major

flex thigh at hip joint + laterally rotate thigh

sartorius

flexes + abducts + laterally rotates the hip

rectus femoris

extends the knee + flexes the hip joint

vastus lateralis

extend the knee

vastus medialis

extend the knee

vastus intermedius

extend the knee

biceps femoris

flexes the knee + extends the hip

semitendinosus

flexes the knee + extends the hip

semimembranosus

flexes the knee + extends the hip

gracilis

adducts thigh at hip joint

adductor longus

adducts thigh at hip joint

adductor brevis

adducts thigh at hip joint

adductor magnus

adducts thigh at hip joint

pectineus

adducts thigh at hip joint

tibialis anterior

dorsiflexion of ankle + inversion of the foot

gastrocnemius

plantar flexes foot at ankle joint

soleus

plantar flexes foot at ankle joint

fibularis longus

plantar flexes + everts foot