Muscle: Origins, Insertions and Actions

Question 1

Frontalis (Epicranius)

Answer 1

Frontal bone;
Skin of eyebrow;
Raises eyebrow

Question 2

Temporalis

Answer 2

Frontal, parietal bones;
Coronoid process of mandible;
Closes jaw;

Question 3

Masseter

Answer 3

Zygomatic arch;
Mandible;
Closes jaw;

Question 4

Orbicularis oris

Answer 4

Mainly circular muscle and other facial muscles;
Muscle and skin at angles of mouth;
Puckers and closes lips;

Question 5

Sternocleido-mastoid

Answer 5

Clavicle;
Mastoid process of temporal bone;
Flexes neck forward

Question 6

Deltoid

Answer 6

Clavicle;
Humerus;
Arm abduction;

Question 7

Trapezius

Answer 7

Occipital bone;
Acromion;
Extends head;

Question 8

Pectoralis Major

Answer 8

Clavicle;
Humerus;
Adducts arms;

Question 9

Latissimus dorsi

Answer 9

Thoracic;
Proximal humerus;
Moves upper arm back and down toward rear end;

Question 10

Rectus abdominis

Answer 10

Pubic crest;
Xiphoid process, costal cartilage of ribs 5-7;
Flexes and rotates trunk

Question 11

External oblique

Answer 11

Lower 8 ribs;
Illiac Crest;
Rotate trunk;

Question 12

Gluteus maximus

Answer 12

Coccyx;
Iliotibial tract to lateral femur;
Moves leg out and back;

Question 13

Triceps brachii

Answer 13

Glenoid cavity proximal humerus;
Olecranon of ulna;
Extends forearm;

Question 14

Biceps brachii

Answer 14

Coracoid process;
Proximal radius;
Flexes forearm

Question 15

Brachioradialis

Answer 15

Distal humerus;
Distal radius;
Flexes forearm;

Question 16

Flexors in forearm

Answer 16

Distal humerus;
Metacarpals;
Flex wrist;

Question 17

Extensors in forearm

Answer 17

Distal humerus;
Metacarpals;
Extend wrist

Question 18

Biceps femoris

Answer 18

Ischium;
Head of fibula;
Extends thigh;

Question 19

Semitendinosus

Answer 19

Ischium;
Medial, proximal tibia;
Flexes (bends) knee;

Question 20

Sartorius

Answer 20

Illiac spine;
Medial, proximal tibia;
Flexes, abducts, laterally rotates thigh (places ankle on knee);

Question 21

Vastus Medialis

Answer 21

Greater Trochanter;
Tibial tuberosity, patella;
Extends knee;

Question 22

Rectus femoris;

Answer 22

Illiac spine;
Tibial tuberosity, patella;
Extends knee;

Question 23

Gastrocnemius

Answer 23

Distal femur;
Calcaneus;
Points toe;

Question 24

Tibialis Anterior

Answer 24

Upper tibia;
Tarsal, 1st metatarsal;
Raises toe;