Muscles of the Trunk

Question 1

Origin, Insertion, and Action for the External abdominal oblique

Answer 1

Origin: Ribs 5-12
Insertion: Linea alba, iliac crest, pubis
Action: Compresses abdominal wall, laterally rotates truck

Question 2

Origin, Insertion, and Action for the Serratus anterior

Answer 2

Origin: Ribs 1-8
Insertion: Vertebral border and inferior angle of scapula
Action: Abducts scapula

Question 3

Origin, Insertion, and Action for the External intercostals

Answer 3

Origin: Inferior border of a rib
Insertion: Superior border of rib below
Action: Elevates ribs

Question 4

Origin, Insertion, and Action for the Internal intercostals

Answer 4

Origin: Superior border of rib
Insertion: Inferior border of rib above
Action: Depresses ribs

Question 5

Origin, Insertion, and Action for the Diaphragm

Answer 5

Origin: Xiphoid process, lower ribs, upper lumbar vertebrae
Insertion: Central tendon
Action: Inspiration (contraction) and expiration (relaxation)

Question 6

Origin, Insertion, and Action for the Rhomboideus major

Answer 6

Origin: Spines of T2-5
Insertion: Lower one-third of vertebral border of scapula
Action: Adducts scapula

Question 7

Name an action for the Internal abdominal oblique

Answer 7

Compresses abdominal wall, laterally rotates trunk

Question 8

Name an action for the Transversus abdominins

Answer 8

Compresses abdominal wall, laterally rotates trunk

Question 9

Name an action for the Rectus abdominis

Answer 9

Flexes vertebral column, compresses abdominal wall

Question 10

Name an action for the Erector spinae

Answer 10

Extends and rotates vertebral column and head

Question 11

Name an action for the Multifidus

Answer 11

Extends and rotates vertebral column

Question 12

Name an action for the Quadratus lumborum

Answer 12

Extends and abducts vertebral column

Question 13

Name an action for the Rhomboideus minor

Answer 13

Adducts scapula

Question 14

Name the 3 muscles of respiration

Answer 14

1. Diaphragm
2. External intercostals
3. Internal intercostals