Abdomen OINA's

Question 1

Rectus Abdominis

Answer 1

O-Anterior pubis
I-Cartilages of ribs 5-7, Xiphoid process of sternum
N-Intercostal n.
A-Flexes lumbar spine (Active during expiration and maintains abdominal tone

Question 2

Psoas Major

Answer 2

O-Transverse processes, intervertebral discs and bodies of T12-L5
I-Lesser trochanter
N-L1-L3
A-Flexes thigh and trunk (picture cruch with stationary legs)

Question 3

Iliacus

Answer 3

O-Superior 2/3 of Iliac fossa
I-Lesser tochanter of femur
N-Femoral n.
A-Flexes trunk

Question 4

Quadratus Lumborum

Answer 4

O- 12th rib and tips of lumbar transvesre process
I-Iliolumbar ligament and iliac crest
N-T12-L4
A-Flexes trunk laterally and fixes 12th rib

Question 5

Obturator internus

Answer 5

O-Ilium, superior pubic ramus, and ischium
I-Greater trochanter of femur (not relevant)
N-nerve to obturator internus
A-not relevant

Question 6

Piriformis

Answer 6

O-2nd-4th sacral segments
I-Greater trochanter of femur
N-S1-S2
A- not relevant

Question 7

Coccygeus

Answer 7

O-Ischial spine
I-Inferior end of sacrum, coccyx
N-S3/S4/S5 (it can vary)
A-Supports pelvis viscera and flexes coccyx

Question 8

Iliococcygeus (Levator ani)

Answer 8

O-Tendinous arch of obturator fascia
I-Perineal body, coccyx
N-S4, Pudendal n.
A-Supports pelvic viscera

Question 9

Puborectalis (Levator ani)

Answer 9

O-Inferior ramus of pubis
I-Rectum, prostate in males, vagina in females
N-S4, Pudendal nerve
A-Supports pelvic viscera

Question 10

Pubococcygeus (Levator ani)

Answer 10

Inferior ramus of pubis, tendinous arch of obturator internus
I-coccyx
N-S4, Pudendal n.
A-Supports pelvis viscera