BIO Lab Muscles origin, insertion, and action

gracilis action

adduction of thigh; flexion and medial rotation of leg

Deltoid action

anterior fibers; medial rotation and flexion of arm middle fibers; abduction of arm posterior fibers; lateral rotation and extension of arm anterior and posterior fibers; act together to adduct the arm

rectus femoris origin

anterior inferior iliac spine of ilium

sartorius origin

anterior superior iliac spine of ilium

gracilis origin

body and inferior ramus of pubic bone

gastrocnemius insertion

calcaneus by the calcaneal tendon

soleus insertion

calcaneus by the calcaneal tendon

orbicularis oris action

closes and protrudes lips

deltoid insertion

deltoid tuberosity of humerus

triceps brachii action

extension of forearm; long head extends and adducts arm

vastus lateralis action

extension of leg

vastus medialis action

extension of leg

rectus femoris action

extension of leg; flexion of thigh

biceps femoris action

extension of thigh; flexion of leg

extensor digitorum action

extension of wrist and fingers

extensor digitorum insertion

extensor expansions of medial four digits

external oblique origin

external surfaces of inferior eight ribs

sternocleidomastoid action

flexion and lateral flexion of the neck; rotates head so that face is turned superiorly and to the opposite side

biceps brachii action

flexion and supination of forearm; flexion of arm

rectus abdominis action

flexion of vertebral column; stabilizes pelvis during walking; increases intraabdominal pressure during forced expiration

sartorius action

flexion, abduction and lateral rotation of thigh; flexion of leg

pectoralis major action

flexion, medial rotation, and adduction of arm

vastus lateralis origin

greater trochanter and lateral lip of linea aspera of femur

soleus origin

head of fibula; posterior surface of fibula; medial aspect of tibia

vastus medialis origin

intertrochanteric line and medial lip of linea aspera

extensor digitorum origin

lateral epicondyle of humerus

gastrocnemius origin

lateral head; lateral condyle of femur medial head; popliteal surface of femur just superior to medial condyle

pectoralis major insertion

lateral lip of intertubercular groove on humerus

biceps femoris insertion

lateral side of head of fibula

Deltoid origin

lateral third of clavicle; acromion process; spine of scapula

trapezius insertion

lateral third of clavicle; acromion process; spine of scapula

external oblique insertion

linea alba; pubic crest; pubic tubercle; iliac crest

orbicularis oris insertion

lips

biceps femoris origin

long head: ischial tuberosity of ischium short head: linea aspera and lateral supracondylar line of femur

triceps brachii origin

long head; inferior margin of glenoid fossa of scapula lateral head; posterior surface of humerus medial head; posterior surface of humerus, inferior head to origin of lateral head

Biceps brachii origin

long head; superior margin of glenoid fossa of scapula short head; coracoid process of scapula

sternocleidomastoid origin

manubrium; medial one third of clavicle

sternocleidomastoid insertion

mastoid process; occipital bone near mastoid process

orbicularis oris origin

maxillary bone; mandible

pectoralis major origin

medial half of clavicle; sternum; costal cartilages of ribs one through six

gracilis insertion

medial surface of tibia near knee joint

sartorius insertion

medial surface of tibia near the knee joint

triceps brachii insertion

olecranon process of ulna

soleus action

plantar flexion of foot

gastrocnemius action

plantar flexion of foot; flexion of leg

trapezius origin

posterior surface of occipital bone; ligamentum nuchae; spinous processes of thoracic vertebrae

rectus abdominis origin

pubic crest; pubic symphisis

biceps brachii insertion

radial tuberosity of radius; fascia of medial forearm via bicipital aponeurosis

external oblique action

rotation and lateral flexion of trunk; increases intraabdominal pressure during forced expiration

trapezius action

superior fibers; elevate scapula middle fibers; retract scapula inferior fibers; depress scapula

rectus femoris insertion

tibial tuberosity by the patellar ligament

vastus lateralis insertion

tibial tuberosity by the patellar ligament

vastus medialis insertion

tibial tuberosity by the patellar ligament

rectus abdominis insertion

xiphoid process; costal cartilages ribs 5-7