Muscle origin, insertion, and action

Masseter origin

Zygomatic arch

Masseter insertion

Angle and ramus of mandible

Masseter action

Elevates mandible

Sternocleidomastoid origin

Clavicle and manubrium of sternum

Sternocleidomastoid insertion

Mastoid process

Sternocleidomastoid action

Flex and rotate head

Rhomboid major origin

Spinous process if T2-T5

Rhomboid major insertion

Medial border of scapula

Rhomboid major action

Abduct/retract scapula

Pectoralis major origin

Sternal end of clavicle; sternum; cartilage of true ribs

Pectoralis major insertion

Intertubercular sulcus; greater tubercle of humerus

Pectoralis major action

Flexis, rotates, and abducts humerus

Deltoid origin

Lateral 1/3 of clavicle; acromion process; spine of scapula

Deltoid insertion

Deltoid tuberosity of humerus

Deltoid action

Abducts humerus

Triceps brachii origin

Latrell scapula; proximal humerus

Triceps brachii insertion

Olecranon process

Triceps brachii action

Extends forearm

Biceps brachii origin

Coracoid processes of scapula; Glendon’s cavity

Biceps brachii insertion

Radial tuberosity

Biceps brachii action

Flexes forearm

Sartorius origin

Anterior superior iliac spine (ASIS)

Sartorius insertion

Medial aspect of proximal tibia

Sartorius action

Flexes, abducts, rotates thigh; flexes knee

Gracilis origin

Inferior pubic bone; ischial ramus

Gracilis insertion

Medial surface if proximal tibia

Gracilis action

Adducts thigh

Rectus femoris origin

Anterior inferior iliac spine

Rectus femoris insertion

Patella, tibial tuberosity

Rectus femoris action

Extends knee; flexes thigh at hip

Gluteus Maximus origin

Ilium, sacrum, and coccyx

Gluteus Maximus insertion

Gluteal tuberosity

Gluteus Maximus action

Extends thigh

Biceps femoris origin

Ischial tuberosity; femur

Biceps femoris insertion

Lateral condole of tibia; head of fibula

Biceps femoris action

Extends thigh; flexes knee

tibialis anterior origin

Lateral condyle of tibia

tibialis anterior insertion

Tarsal bones; 1st metatarsal

tibialis anterior action

Dorsiflexes foot

Gastrocnemius origin

Medial and lateral condoles of femur

Gastrocnemius insertion

Calcaneus

Gastrocnemius action

Plantarflexes foot

Iliopsoas origin

Iliac fossa, crest, and lumbar vertebrae

Iliopsoas insertion

Lesser trochanter of femur

Iliopsoas action

Flexes thigh and trunk