action origin and insertion of muscles

orbicularis oculi origin

orbital portions of the frontal bone and maxilla

orbicularis oculi insertion

skin of the orbital area and eyelids

orbicularis oculi action

closes eye

buccinator origin

molar regions of maxilla and mandible

buccinator insertion

orbicular oris muscle and CT of cheek/ lips

buccinator action

pulls the cheeks in, produces sucking movements

masseter origin

zygomatic arch

masseter insertion

angle and lateral surface of ramus of madible

masseter action

elevates the mandible

external intercostals origin

lower edge of rib superior to its insertion

external intercostals insertion

upper edge of rib inferior to its origin

external intercostals actions

elevate rib cage, assist in inspiration

serratus anterior origin

first 9 ribs

serratus anterior insertion

medial border of scapula

serratus anterior action

prime mover of scapula in protraction, assists in superior rotation of scapula

pectoralis major origin

medial clavicle, sternum, costal cartilages 1-7

pectoralis major insertion

greater tubercle and lateral lip of intertubercular sulcus of humerus

pectoralis major action

flexes and adducts the arm, rotates arm medially

subscapularis origin

subscapular fossa of scapula

subscapularis insertion

lesser tubercle of humerus

subscapularis action

adducts and rotates the humerus medially; stabilizes shoulder joint

rectus abdominis origin

superior aspect of pubis bones

rectus abdominis insertion

costal cartilage of inferior ribs

rectus abdominis action

flexes the trunk, compresses abdominal cavity

gluteus maximus origin

posterior and lateral portions of the ilium, sacrum, and coccyx

gluteus maximus insertion

gluteal tuberosity of femur and iliotibial tract

gluteus maximus action

extends the thigh laterally rotates thigh, abducts thigh

splenius capitis origin

spinous processes of C vertebrae and CT of posterior neck

splenius capitis insertion

mastoid process and occipital bone

splenius capitis action

extends head w other muscles rotates head to same side as the muscle that it contracting

levator scapulae origin

transverse processes of C1-C4

levator scapulae insertion

superior angle of scapula

levator scapulae action

elevates scapula

deltoid origin

acromion and spine of scapula, lateral clavicle

deltoid insertion

deltoid tuberosity of humerus

deltoid action

abducts arm, secondarily flexes and extends arm

triceps brachii origin

infraglenoid tubercle; posterior proximal diaphysis, most of posterior diaphysis

triceps brachii insertion

olecranon process

triceps brachii action

extends the forarm

brachialis origin

distal ½ of the diaphysis of the anterior humerus

brachialis insertion

coronoid process of ulna

brachialis action

flexes the forearm

supinator origin

lateral epicondyle of humerus, area of the radial notch of ulna

supinator insertion

anterior/ lateral area of proximal third of radius, distal to the tuberosity

supinator action

supinates forearm

palmaris longus origin

medial epicondyle of humerus

palmaris longus insertion

flexor retinaculum and surrounding CT in palm of hand

palmaris longus action

flexes hand; tenses dense CT in palm of hand

sartorius origin

anterior superior iliac spine

sartorius insertion

proximal portion of the medial condyle of the tibia

sartorius action

flexes the thigh and lef; abducts and laterally rotates the thigh

rectus femoris origin

anterior inferior iliac spine, superior margin of acetabulum

rectus femoris insertion

patella and tibial tuberosity

rectus femoris action

extends the leg, flexes the thigh

extensor digitorum longus origin

lateral condyle of the tibia and proximal portion of the fibula

extensor digitorum longus insertion

phalanges and CT of toes 2-5

extensor digitorum longus action

extends the toes and dorsiflexes the foot

gastrocnemius origin

medial and lateral condyles of the femur

gastrocnemius insertion

posterior calcaneus

gastrocnemius action

plantar flexes foot, flexes leg

popliteus origin

lateral condyle of femur

popliteus insertion

posterior surface of proximal tibia

popliteus action

flexes leg, rotates leg