ORIGINS/INSERTIONS/ACTIONS

What is the origin of the masseter muscle?

Zygomatic arch

Where does the masseter muscle insert?

Angle/ramus of mandible

What is the action of the masseter muscle?

Elevates mandible

What is the origin of the buccinator muscle?

Maxillary bone

Where does the buccinator muscle insert?

Orbicularis oris muscle

What is the action of the buccinator muscle?

Compresses cheeks

What bones are involved in the origin of the orbicularis oculi?

Frontal/maxillary bones

What is the insertion point of the orbicularis oculi?

Eyelid

What does the orbicularis oculi do?

Blinking

What is the origin of the zygomaticus major?

Zygomatic bone

Where does the zygomaticus major insert?

Elevation of lateral corners of mouth

What does the zygomaticus minor insert?

Skin and muscle at the corner of the mouth

What is the origin of the platysma?

Fascia of chest

Where does the platysma insert?

Lower margin of mandible

What action does the platysma perform?

Tenses skin of neck

What is the origin of the sternocleidomastoid?

Manubrium of sternum

What is the insertion of the sternocleidomastoid?

Mastoid process

What is the action of the sternocleidomastoid muscle?

Flexion of neck

What is the origin of the pectoralis major?

Clavicle/sternum

Where does the pectoralis major insert?

Intertubercular sulcus of humerus

What action does the pectoralis major perform?

Flexion of arm

What is the origin of the deltoid muscle?

Acromion and spine of scapula

Where does the deltoid insert?

Deltoid tuberosity of humerus

What does the deltoid muscle do?

Abduction of the arm at the shoulder

What is the origin of the rectus abdominis?

Xiphoid process of the sternum

What action does the rectus abdominis perform?

Rotates vertebral column

What is the origin of the external oblique muscle?

Lower eight ribs

Where does the external oblique insert?

Linea alba

What is the origin of the trapezius?

Occipital bone

What is the insertion of the trapezius?

Acromion and spinous process of the scapula

What does the trapezius do?

Elevation of scapula

What is the origin of the infraspinatus?

Infraspinous fossa

Where does the infraspinatus insert?

Greater tubercle of the humerus

What action does the infraspinatus perform?

Lateral rotation of the arm at the shoulder

What is the origin of the supraspinatus?

Supraspinous fossa

Where does the supraspinatus insert?

Greater tubercle of the humerus

What action does the supraspinatus perform?

Abduction of the arm at the shoulder

What is the origin of the triceps brachii?

Posterior humerus

Where does the triceps brachii insert?

Olecranon of ulna

What action does the triceps brachii perform?

Extension of the forearm at the elbow

What is the origin of the biceps brachii?

Coracoid process

Where does the biceps brachii insert?

Radial tuberosity

What action does the biceps brachii perform?

Flexion of the forearm at the elbow

What is the origin of the brachialis?

Posterior humerus

Where does the brachialis insert?

Coronoid process of ulna

What action does the brachialis perform?

Flexion of the forearm at the elbow

What is the origin of the flexor carpi radialis?

Medial epicondyle of the humerus

Where does the flexor carpi radialis insert?

Base of metacarpals 2 and 3

What action does the flexor carpi radialis perform?

Flexion of the hand at the carpal joints

What is the origin of the extensor digitorum?

Lateral epicondyle of the humerus

Where does the extensor digitorum insert?

Distal phalanges of fingers 2-5

What action does the extensor digitorum perform?

Extension of the fingers at the metacarpal and phalangeal joints

What is the origin of the gracilis?

Ramus and body of pubis

What action does the gracilis perform?

Adduction of thigh at the hip

What is the origin of the rectus femoris?

Tibial tuberosity

What action does the rectus femoris perform?

Flexion of the thigh at the hip

What is the origin of the vastus medialis?

Linea aspera

Where does the vastus medialis insert?

Tibial tuberosity

What action does the vastus medialis perform?

Extension of the lower leg at the knee

What is the origin of the semitendinosus?

Ischial tuberosity

Where does the semitendinosus insert?

Medial aspect of upper tibial shaft

What is the origin of the semimembranosus?

Ischial tuberosity

Where does the semimembranosus insert?

Medial condyle of the tibia

What is the origin of the tibialis anterior?

Lateral condyle of the tibia

Where does the tibialis anterior insert?

Medial cuneiform bone

What action does the tibialis anterior perform?

Dorsiflexion

What is the origin of the gastrocnemius?

Medial and lateral condyles of the femur

Where does the gastrocnemius insert?

Calcaneus

What action does the gastrocnemius perform?

Plantar flexion