Atlas of Human Anatomy by Netter

d. Subcostal nerves (T12) supply skin below umbilicus

e. Iliohypogastric and ilioinguinal nerves (terminal branches of L1) supplies skin below umbilicus

Vascular supply

Arteries

Anterior and collateral branches of posterior intercostal arteries

Branches of the internal thoracic arteries

a. Superior epigastric

b. Musculophrenic

Inferior epigastric (from external iliac)

Branches of the femoral artery

a. Superficial epigastric

b. Superficial circumflex iliac

Veins

Venous drainage is via venae comitantes (veins corresponding to the arteries listed)

Blood drains away from the umbilicus

Venous drainage to the caval system

Lymphatics

Superficial lymphatics above the umbilicus lymph drains to the axillary nodes

Superficial lymphatics below the umbilicus drain to the superficial inguinal nodes

Deep lymphatics

a. Accompany deep veins

b. Drain to external iliac, common iliac, and lumbar nodes

Posterior abdominal wall

[Plate 258, Veins of Posterior Abdominal Wall]

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Muscle Superior Attachment

(Origin)

Inferior

Attachment

(Insertion)

InnervationBlood Supply Actions

Psoas

major

Transverse processes of

lumbar vertebrae; sides of

bodies of T12-L5

vertebrae, and intervening

Lesser trochanter

of femur

Lumbar

plexus via

ventral

branches

Lumbar arteries Acting superiorly with iliacus, flexes

hip; acting inferiorly, flexes vertebral

column laterally; used to balance

trunk in sitting position; acting