O & I: Abdominal Muscle

Question 1

Origin: Quadratus Lumborum

Answer 1

Medial half of inferior border of 12th ribs and tips of lumbar transverse processes

Question 2

Insertion: Quadratus Lumborum

Answer 2

iliolumbar ligament and internal lip of iliac crest

Question 3

Innervation: Quadratus Lumborum

Answer 3

anterior branches of T12 and L1 - L4 nerves

Question 4

Action: Quadratus Lumborum

Answer 4

Extends and laterally flexes vertebral column; fixes 12th rib during inspiration

Question 5

Origin: Posas Major

Answer 5

sides of T12-L5 vertebrae and discs between them; transverse processes of all lumbar vertebrae

Question 6

Insertion: Posas Major

Answer 6

Lesser trochanter of femur

Question 7

Innervation: Posas Major

Answer 7

anterior rami of lumber nerves (L1, L2, L3)

Question 8

Action: Posas Major

Answer 8

act conjointly in flexing thigh at hip joint and in stabilizing this joint

Question 9

Origin: Posas Minor

Answer 9

sides of T12-L1 vertebrae and intervertebral discs

Question 10

Insertion: Posas Minor

Answer 10

pectineal line and iliopubic eminence via iliopectineal arch

Question 11

Innervation: Posas Minor

Answer 11

anterior rami of lumbar nerves (L1, L2)

Question 12

Action: Posas Minor

Answer 12

act conjointly in flexing thigh at hip joint and in stabilizing this joint

Question 13

Origin: Iliacus

Answer 13

iliac crest, iliac fossa, ala of sacrum, and anterior sacro-iliac ligaments

Question 14

Insertion: Iliacus

Answer 14

tendon of psoas major, lesser trochanter, and femur distal to it

Question 15

Innervation: Iliacus

Answer 15

Femoral N. (L2, L3)

Question 16

Action: Iliacus

Answer 16

act conjointly in flexing thigh at hip joint and in stabilizing this joint

Question 17

Origin: External Oblique

Answer 17

external surfaces of 5th - 12th ribs

Question 18

Insertion: External Oblique

Answer 18

linea alba, pubic tubercle, and anterior half of iliac crest

Question 19

Innervation: External Oblique

Answer 19

Thoraco-abdominal nerves (T7-T11 spinal nerves) and subcostal nerve

Question 20

Action: External Oblique

Answer 20

compresees and supports abdominal viscera, flexes and rotates trunk

Question 21

Origin: Internal Oblique

Answer 21

Thoracolumbar fascia, anterior two thirds of iliac crest, and connective tissue deep to lateral third of inguinal ligament

Question 22

Insertion: Internal Oblique

Answer 22

inferior borders of 10th - 12th ribs, linea alba, and pecten pubis via conjoint tendon

Question 23

Innervation: Internal Oblique

Answer 23

Thoraco-abdominal nerves (anterior rami of T6 - T12 spinal nerves) and first lumbar nerves

Question 24

Action: Internal Oblique

Answer 24

compresees and supports abdominal viscera, flexes and rotates trunk

Question 25

Origin: Transversus Abdominis

Answer 25

internal surfaces of 7th - 12th costal cartilages, thoracolumbar fascia, iliac crest, and connective tissue deep to lateral third of inguinal ligament

Question 26

Insertion: Transversus Abdominis

Answer 26

Linea alba with aponeurosis of internal oblique, pubic crest, and pecten pubis via conjoint tendon

Question 27

Innervation: Transversus Abdominis

Answer 27

Thoraco-abdominal nerves (anterior rami of T6 - T12 spinal nerves) and first lumbar nerves

Question 28

Action: Transversus Abdominis

Answer 28

compresses and supports abdominal viscera

Question 29

Origin (Distal Attach): Rectus Abdominis

Answer 29

pubic symphysis and pubic crest

Question 30

Insertion (Proximal Attach): Rectus Abdominis

Answer 30

xiphoid process and 5th - 7th costal cartilages

Question 31

Innervation: Rectus Abdominis

Answer 31

thoraco-abdominal nerves (anterior rami of T6 - T12 spinal nerves)

Question 32

Action: Rectus Abdominis

Answer 32

flexes trunk (lumbar vertebrae) and compresses abdominal viscera; stabilizes and controls tilit of pelvis (antilordosis)