Human muscle Anatomy

occipitofrontalis

Pulls up eyebrows

Orbicularis oculi

Closes eye

Orbicularis Oris

Pucker

Zygomaticus

Smile

Buccinator

Compresses cheeks (fish face)

Platysma

Frown

Sternocleidomastoid

Pulls head to side

Masseter

Chewing

Temporalis

Raises mandible

Occipitalis

Connects to frontalis to help raise the eyebrows

Deltoid

Prime mover of arm abduction

Rhomboideus major

Adduction of scapula (moves scapula towards the vertebral column)

Teres major

Adduction of humerus (stabilization of the head of the humerus in the glenoid cavity)

Latissimus dorsi

Adduction of the humerus

Trapezius

Extends the head (antagonist of the sternocleidomastoid) and elevates, adducts, and stabilizes the scapula

Subscapularis

Internal rotation of the humerus

Supraspinatus

Abducts the humerus at the shoulder

Infraspinatus

External rotation of the humerus

Teres minor

Works with the infraspinatus in external rotation of the humerus

Pectoralis major

Adducts and flexes the humerus

Serratus anterior

Stabilizes and rotates the scapula (boxing muscle)

External intercostals

(Deep) raises ribcage to bring air into the lungs

Internal intercostals

(Deep) depresses the ribcage to move air out of the lungs

Rectus abdominus

Flexion of the vertebral column, compresses the abdominal contents

External and internal obliques

Flexion of the vertebral column, rotates the trunk and bends it laterally

Transversus abdominus

(Lateral/deepest) compresses the abdominal contents

Gluteus Maximus

Extension of the hip (climbing stairs, jumping)

Gluteus Medius

Abduction of hip, holding the pelvis steady when walking

Tensor Faciae Latae

(Lateral) flexes and rotates the thigh medially, stabilization of the knee joint

Gracilis

Adducts the thigh, flexes knee joint

Iliopsoas

Made of two fused muscles: illiacus and psoas major, prime mover of hip flexion

Adductor longus

Adducts, rotates, and flexes the thigh

Adductor Magnus

Adducts and extends the thigh

Rectus femoris, vastus lateralis, vastus medialis, vastus intermedius

(Quad group)
All work together to extend the knee

Sartorius

Used to sit cross-legged, assists in flexing, abducting, and rotating the hip, flexion of knee

Semimembranosus
Semitendinosus
Biceps femoris

(Hamstring group) all work together to flex the knee

Gastrocnemius

Prime mover for plantar flexion, "toe dancer's muscle"

Soleus

Synergist for plantar flexion

Tibialis anterior

Dorsiflexes and inverts the foot

Biceps brachii

Turns hand to face palm, and flexes arm and forearm

Triceps brachii

Extends forearm, adducts arm, extends shoulder

Brachialis

Assists the biceps brachii in flexing the elbow

Flexor Carpi radialis

Flex and abduct the hand