Muscles

Question 1

origin of the serratus anterior

Answer 1

by a series of muscle slips (branches) from ribs 1-8 (or 9)

Question 2

insertion of the serratus anterior

Answer 2

entire anterior surface of medial border of scapula

Question 3

action of the serratus anterior

Answer 3

rotates scapula so its inferior angle moves laterally and upward

Question 4

origin of the rectus abdominis

Answer 4

pubic crest and symphysis

Question 5

insertion of the rectus abdominis

Answer 5

xiphoid process and costal cartilages of ribs 5-7

Question 6

action of the rectus abdominis

Answer 6

flex and rotate lumbar region of vertebral column

Question 7

origin of the external oblique

Answer 7

by fleshy strips from outer surfaces of lower 8 ribs

Question 8

insertion of the external oblique

Answer 8

linea alba via a broad aponeurosis ; pubic crest and tubercle and iliac crest

Question 9

action of the external oblique

Answer 9

flex vertebral column and compress abdominal wall ; trunk rotation and lateral flexion

Question 10

origin of the internal oblique

Answer 10

lumbar fascia, iliac crest and inguinal ligament

Question 11

insertion of the internal oblique

Answer 11

linea, pubic crest, last 3-4 ribs and costal margin

Question 12

action of the internal oblique

Answer 12

flex vertebral column and compress abdominal wall ; trunk rotation and lateral flexion

Question 13

origin of the transversus abdominis

Answer 13

inguinal ligament, lumbar fascia, cartilages of last 6 ribs and iliac crest

Question 14

insertion of the transversus abdominis

Answer 14

linea alba and pubic crest

Question 15

action of transversus abdominis

Answer 15

compresses abdominal contents

Question 16

origin of the pectoralis minor

Answer 16

anterior surfaces of ribs 3-5 9or 2-4)

Question 17

insertion of pectoralis minor

Answer 17

coracoid process of scapula

Question 18

action of the pectoralis minor

Answer 18

with ribs fixed, pulls scapula forward and downward

Question 19

origin of the trapezius

Answer 19

occipital bone, ligamentum nuchae, spinous processes of C7 and all thoracic vertebrae

Question 20

insertion of the trapezius

Answer 20

acromion, spine of scapula and lateral 3rd of clavicle

Question 21

action of the trapezius

Answer 21

stabilizes, elevates, retracts and rotates scapula

Question 22

origin of the pectorallis major

Answer 22

sternal end of clavicle, sternum, cartilage of ribs 1-6 (or 7) and aponeurosis of external oblique muscle

Question 23

insertion of the pectorallis major

Answer 23

fibers converge by a short tendon into tubercular sulcus and greater tubercle of humerus

Question 24

action of pectorallis major

Answer 24

adducts and medially rotates ar