Muscle Origin, Insertion, And Action.

Front 1

Occipitalis

Back 1

O: occipital bone and mastoid process
I: epicranial aponeurosis
A: moves scalp backward

Front 2

Medial and lateral pterygoid muscles

Back 2

O: sphenoid bone
I: mandible
A: raise mandible, protract mandible and move it laterally

Front 3

External oblique

Back 3

O: angle of lower ribs
I: illiac crest, linea alba
A: compress the abdomen, rotate trunk

Front 4

Internal oblique

Back 4

o: illiac crest and inguinal ligament
I: linea alba, cartilages of lower ribs
a: compress the abdomen and rotate trunk.

Front 5

Transverse abdominus

Back 5

o: illiac crest, inguinal ligament, cartilages of lower ribs
I: linea alba, pubic crest, zymphoid process
a: compress the abdominal contents.

Front 6

Rectus abdominus (wash board)

Back 6

O: pubic crest and symphysis
I: xiphoid process and cartilage of middle ribs
A: flexes and bends forward the spine, rotate lumbar region of vertebral column

Front 7

Seratus anterior

Back 7

o: lateral surface of the upper ribs
I: medial border of the scapula
a: pull the scapula forward and downward

Front 8

Pectoralis minor

Back 8

o: sternal ends of the upper ribs
I: coracoid process of scapula
a: pull the scapula forward and downward

Front 9

Rhomboids

Back 9

o: spines of cervical and thoracic vertebra
I: medial border of scapula
a: elevates and adducts scapula

Front 10

Pectoralis major

Back 10

o: clavicle, sternum, coastal cartilage of upper ribs
I: greater tubercle of humerus
a: flexes, adducts, and rotates arm medially

Front 11

Deltoid

Back 11

o: clavicle, acromion process, and spine of the scapula
I: deltoid tuberosity of the humerus
a: abducts the arm

Front 12

Supraspinatus

Back 12

o: supra spinous fossa of the scapula
I: superior part of the greater tubercle of the humerus
a: abducts the arms and laterally rotate the humerus

Front 13

Infraspinatus

Back 13

o: infraspinous fossa of scapula
I: greater tubercle of humerus
a: rotates the humerus laterally

Front 14

Subscapularis

Back 14

o: subscapula fossa of scapula
I: lesser tubercle of the humerus
a: internal/medially rotates the humerus

Front 15

Biceps brachii

Back 15

o: 2 origins tuberosity above the glenoid cavity
I: radial tuberosity of the radius
a: flexes elbow and supinates forearm

Front 16

Triceps brachii

Back 16

o: long head: infraglenoid tubercle of the scapula, lateral head: posterior shaft of humerus, medial head: posterior humerus shaft distal to radial sulcus.
I: the olecranon process of the ulna
a: extends the forearm.

Front 17

Tensor fasciae latae

Back 17

o: anterior border of the illiac and the illiac crest
I: iliotibial tract
a: abduct the thigh

Front 18

Gricilis

Back 18

o: inferior edge of the symphysis pubis
I: proximal medial surface of tibia
a: abducts the leg, flexes and rotates the leg

Front 19

Sartorius

Back 19

o: anterior superior illiac spine
I: medial surface of the tibia
a: flexes the leg/thigh, medially rotates the lower leg

Front 20

Quadriceps femoris

Back 20

4 muscles with separate origins, but common insertion is on the quadriceps femoris tendon
Action: extends the leg at the knee joint.

Front 21

Rectus femoris

Back 21

o: anterior inferior illiac spine

Front 22

Vastus lateralis

Back 22

o: greater trochanter and linea aspera of the femur

Front 23

Vastus medialis

Back 23

o: medial surface of the linea aspera

Front 24

Vastus intermedius

Back 24

o: anterior and lateral surfaces of the femur

Front 25

Tibialis anterior

Back 25

o: lateral condyle of the tibia
I: first metatarsal and tarsal bones
a: dorsi flexion and inverts foot.