Download Muscle Chart - eCurriculum

ABDOMINAL WALL MUSCLES
MUSCLE
NERVE
1. External abdominal T6-T11 (intercostals)
and T12 (subcostal)
oblique
ORIGIN(S)
INSERTION(S)
ACTION(S)
Compresses abdomen,
both sides flex trunk,
one side turns trunk
toward opposite side
Compresses abdomen,
Thoracolumbar fascia,
both sides flex trunk,
anterior 2/3 iliac crest,
one side turns trunk
lateral 2/3 inguinal lig.
toward same side
Lower fibers of internal Middle spermatic fascia Elevates testis
around spermatic cord
abdominal oblique
muscle
Muscle slips arise from
ribs 5-12
Anterior 1/2 iliac crest,
linea alba, xiphoid,
pubis, pubic crest,
pectineal line
Ribs 7-12, xiphoid, linea
alba, pubic crest,
pectineal line
Costal arch cartilages,
thoracolumbar fascia,
ant. 2/3 iliac crest, lat.
1/3 inguinal ligament
Public crest
Xiphoid, linea alba,
pubic crest, pectineal
line
Compresses abdomen
Costal cartilages 5, 6,
and 7
Flexes trunk (or
upwardly rotates pelvis)
Tightens linea alba
2. Internal abdominal
oblique
T10-T11 (intercostals),
subcostal, and
ilioinguinal
3. Cremaster
Genitofemoral
4. Transversus
abdominis
T7 or T8-T11
intercostals and
subcostal
5. Rectus abdominis
T6 or T7-T11
intercostals and
subcostal
6. Pyramidalis
Subcostal (or
iliohypogastric)
Public crest
Linea alba
7. Quadratus
lumborum
Branches from L1-L4
ventral rami
Iliac crest
8. Psoas major
Transverse processes
Branches from L2-L4
ventral rami or femoral and bodies of T12-L5
nerve
Transverse processes of Stabilizes last rib
L1-L4 and rib 12
during breathing;
extends and laterally
bends spine
Flexes hip (flexes trunk
Joins tendon of iliacus
muscle to insert on the if thigh is fixed)
lesser trochanter of the
femur