Abdominal muscles

Question 1

Iliacus

Answer 1

Ori: upper 2/3 of iliac fossa, ala of sacrum, and AIIS
Ins: lesser trochanter of femur (with psoas major)
N: femoral nerve
Fun: flex & lat rotation of hip

Question 2

Quadratus Lumborum

Answer 2

Ori: Illiolumbar ligament and posterior 1/3 of iliac crest
Ins: rib 12, TP of L1-L4
N: T12, L1-L4
Fun: lat flex of vert column, fixes 12th rib

Question 3

Psoas Major

Answer 3

Ori: TP of all lumbar vertebrae, bodies of TXII - LV, and intervertebral discs
Ins: lesser trochanter of femur
N: L1 - L4
Fun: Flex & lat rotation of hip

Question 4

External Abdominal Oblique

Answer 4

Ori: lower 8 ribs
Ins: Ant half of the iliac crest, line alba, and public tubercle
N: T7-T12
Fn: flexes & contralat rot trunk and compresses abdominal contents

Question 5

Internal Abdominal Oblique

Answer 5

Ori: inguinal lig, ant 2/3 of the iliac crest, and thoracolumbar fascia
Ins: linea alba and lower 6 ribs
N: T7-L1
Fn: flexes & ipsilat rot the trunk (and compresses abdominal contents)

Question 6

Transversus abdominus

Answer 6

Ori: lateral 1/3 of the inguinal lig, ant 3/4 of iliac crest, inner surfaces of the cartilages of the lower 6 ribs
Ins: pubic crest, pectineal line, and line alba
N: T7-L1
Fun: compresses the abdominal contents

Question 7

Rectus Abdominus

Answer 7

Ori: Pubic crest and symphysis pubis
Ins: 5th, 6th, and 7th costal cartilages & xiphoid process
N: T7 - L1
Fun: PRIME MOVER FOR TRUNK FLEXION, post tilt of pelvis, compresses abd contents