[Exercise 12] Muscle Origins, Insertions, & Actions

Question 0

Origin of pectoralis major

Answer 0

Clavicle, sternum, cartilage of ribs 1-6, and aponeurosis of external oblique

Question 1

Insertion of pectoralis major

Answer 1

Intertubercular sulcus of humerus

Question 2

Action of pectoralis major

Answer 2

Prime mover of arm flexion.

Adducts and medially rotates arm

Question 3

Insertion of rectus abdominis

Answer 3

Xiphoid process and costal cartilages of ribs 5-7

Question 4

Origin of rectus abdominis

Answer 4

Pubic crest and symphysis

Question 5

Action of rectus abdominis

Answer 5

Flexes and rotates vertebral column

Question 6

Insertion of trapezius

Answer 6

Acromion and spinous process of scapula.

Lateral third of clavicle

Question 7

Origin of trapezius

Answer 7

Occipital bone, ligamentum nuchae.

Spines of C7 and all thoracic vertebrae

Question 8

Action of trapezius

Answer 8

Stabilizes, raises, rotates, and retracts scapula

Question 9

Insertion of levator scapulae

Answer 9

Medial border of scapula superior to spine

Question 10

Origin of levator scapulae

Answer 10

Transverse processes of C1 - C4

Question 11

Action of levator scapulae

Answer 11

Elevates and addicts scapula

Question 12

Origin of biceps brachii

Answer 12

Short head: coracoid process

Long head: supraglenoid tubercle and tip of glenoid cavity

Question 13

Insertion of biceps brachii

Answer 13

Radial tuberosity

Question 14

Action of biceps brachii

Answer 14

Flexion (powerful) of elbow and supination of forearm

Question 15

Origin of adductor longus

Answer 15

Pubis near pubic symphysis

Question 16

Insertion of adductor longus

Answer 16

Linea aspera

Question 17

Action of adductor longus

Answer 17

Adduct and medially rotate and flex thigh

Question 18

Origin of vastus lateralis

Answer 18

Greater trochanter, intertrochanteric line, and linea aspera

Question 19

Insertion of vastus lateralis

Answer 19

Tibial tuberosity and patella

Question 20

Action of vastus lateralis

Answer 20

Extends and stabilizes knee

Question 21

Origin of gluteus maximus

Answer 21

Dorsal ilium, sacrum, and coccyx

Question 22

Insertion of gluteus maximus

Answer 22

Gluteal tuberosity of femur and iliobial tract

Question 23

Action of gluteus maximus

Answer 23

Major extensor of thigh

Question 24

Origin of gastrocnemius

Answer 24

Medial and lateral consulted of femur

Question 25

Insertion of gastrocnemius

Answer 25

Calcaneus via calcaneal tendon

Question 26

Action of gastrocnemius

Answer 26

Plantar flexes foot

Question 27

Origin of biceps femoris

Answer 27

Ischial tuberosity, linea aspera and distal femur

Question 28

Insertion of biceps femoris

Answer 28

Head of fibula and lateral condyle of tibia

Question 29

Action of biceps femoris

Answer 29

Extends thigh and flexes knee