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
