Muscles of the Trunk

Question 1

External Oblique

Answer 1

Flexes and Compresses the Abdomen

Origin - Lower 8 Ribs

Insertion - Linea Alba, Pubic Crest, Iliac Crest

Question 2

Teres Minor

Answer 2

Rotates Humerus Laterally

Question 3

Infraspinatus

Answer 3

Rotates Humerus Laterally

Question 4

Supraspinatus

Answer 4

Abduction of the Arm

Question 5

Erector Spinae

Answer 5

Extension of Back

Question 6

External Intercostals

Answer 6

Elevate Rib Cage

Origin - Inferior Border of Rib Above

Insertion - Superior Border of Rib Below

Question 7

Internal Intercoastals

Answer 7

Depress Rib Cage

Question 8

Latissimus Dorsi

Answer 8

Extension of Arm with Medial Rotation

Question 9

Levator Scapulae

Answer 9

Elevates and Adducts Scapula

Question 10

Pectoralis Major

Answer 10

Flexes and Adducts Arm

Origin - Sternal End of the Clavicle

Insertion - Intertubecular Groove of the Humerus

Question 11

Rectus Abdominis

Answer 11

Flexes and Rotates Abdomen

Origin - Pubic Crest and Pubic Symphysis

Insertion - Xiphoid process and Costal Cartiladges of ribs 5-7

Question 12

Diaphragm

Answer 12

Increases Chest Volume

Question 13

Transverse Abdominis

Answer 13

Compresses Abdomen

Question 14

Rhomboid Major

Answer 14

Adducts Scapula (Square Shoulders)