Anatomy Atlas

Inferior epigastric artery

Arteria epigastrica inferior
ArteryHigh-yielddraftCardioGI

Branch of the external iliac artery that ascends into the rectus sheath. It's the landmark separating indirect from direct inguinal hernias and must be avoided during paracentesis and laparoscopic port placement.

Core anatomy

Location

Deep surface of the lower anterior abdominal wall, running from just above the inguinal ligament into the rectus sheath.

Origin

External iliac artery, just superior to the inguinal ligament.

Course

Runs superomedially in the extraperitoneal tissue, medial to the deep inguinal ring, raising a peritoneal fold (the lateral umbilical fold). It pierces the transversalis fascia and enters the rectus sheath near the arcuate line, ascending on the deep surface of rectus abdominis.

Branches
  • Cremasteric artery (to the spermatic cord) or artery of the round ligament
  • Pubic branch (may anastomose with the obturator artery, the "corona mortis")
  • Muscular and cutaneous branches
Supplies

Lower rectus abdominis and the medial anterior abdominal wall.

Anastomoses

With the superior epigastric artery (from the internal thoracic) inside the rectus sheath, a collateral route between the subclavian and iliac systems (important in coarctation and aortoiliac occlusion).

Relations

Forms the lateral border of the inguinal (Hesselbach) triangle (inguinal triangle). Indirect inguinal hernias emerge lateral to it through the deep ring; direct hernias emerge medial to it.

Structures supplied

Found in

Forms a boundary of

Generated automatically from links in other entries.

Inguinal region from inside (Hesselbach triangle)The right inguinal region viewed from inside the abdomen, with the midline on the left. The inguinal ligament runs from the anterior superior iliac spine down to the pubic tubercle. The inferior epigastric vessels arise from the external iliac artery just above the ligament and ascend medially to the lateral border of rectus abdominis. The inguinal (Hesselbach) triangle is bounded by the inferior epigastric vessels laterally, the rectus abdominis medially and the inguinal ligament inferiorly; direct hernias pass through it. The deep inguinal ring lies lateral to the inferior epigastric vessels, above the middle of the ligament, where the ductus deferens and testicular vessels enter; indirect hernias enter here. Below the ligament, the femoral ring lies medial to the femoral vein; femoral hernias pass through it.Testicular vesselsIndirect hernia: through thedeep ring, lateral to the IEVAnterior superior iliac spineDeep inguinal ringInguinal ligamentInferior epigastric vessels (IEV)External iliac → femoral arteryExternal iliac → femoral veinRectus abdominisDirect hernia: through thetriangle, medial to the IEVInguinal (Hesselbach) triangle"RIP": Rectus, Inferior epigastrics,Poupart (inguinal) ligamentDuctus deferens (to the pelvis)Superficial ring(in front of this plane)Pubic tubercleFemoral hernia: through the femoralring, medial to the femoral veinRight side, seen from inside theabdomen · midline ← · not to scalemidline

Swipe sideways to see the whole diagram →

Inguinal region from inside (Hesselbach triangle). Right side seen from inside the abdomen, as at laparoscopy. The inferior epigastric vessels separate indirect hernias (lateral, through the deep ring) from direct hernias (medial, through the inguinal triangle). Femoral hernias pass below the inguinal ligament, medial to the femoral vein. The inguinal canal and superficial ring lie in front of this plane (dashed).
Original schematic, created for this atlas.
Internal view of the lower anterior abdominal wall showing the inguinal fossae and the inferior epigastric vessels
Inside view of the lower abdominal wall: the inferior epigastric vessels separating the lateral and medial inguinal fossae.
Henry Vandyke Carter, Gray's Anatomy of the Human Body, 20th ed. (1918), Fig. 1036. Source · Public domain (Public domain in the US: published before January 1, 1931 (per Wikimedia Commons))

Clinical correlations

Landmark for inguinal hernia type PANCE

Mechanism / lesion

The vessels mark the medial edge of the deep inguinal ring.

Classic presentation

At surgery (especially laparoscopic), a hernia sac lateral to the vessels is indirect and one medial to them is direct.

Injury during paracentesis or laparoscopy PANCE

Mechanism / lesion

Needles or trocars placed too medially in the lower abdomen.

Classic presentation

Abdominal wall hematoma or hemoperitoneum. Paracentesis is performed lateral to the rectus sheath, commonly in the left lower quadrant about two fingerbreadths medial and superior to the ASIS, ideally with ultrasound guidance to avoid the vessels. verify

Rectus sheath hematoma

Mechanism / lesion

Rupture of the inferior epigastric artery, often in anticoagulated patients.

Classic presentation

Tender lower abdominal wall mass (see rectus abdominis).

High-yield PANCE pearls

  • Indirect hernia = lateral to the inferior epigastric vessels; direct = medial (Hesselbach triangle).
  • Paracentesis: stay lateral to the rectus sheath (LLQ preferred) to avoid the inferior epigastric artery.
  • Superior–inferior epigastric anastomosis = collateral pathway in coarctation or aortoiliac occlusion.

Imaging anatomy

CT

Contrast CT shows the vessel and active bleeding in rectus sheath hematoma; CT angiography before abdominal wall flaps (the DIEP flap in breast reconstruction is based on its perforators).

Ultrasound

Color Doppler identifies the vessel before paracentesis or trocar placement.

Key views & landmarks
  • Color Doppler of the lower abdominal wall before procedures

Physical exam

Surface landmarks

Runs roughly from the mid-inguinal point toward the lateral edge of the rectus sheath at the arcuate line. Not palpable.

Strength / function testing

Before paracentesis, percuss for dullness laterally and use ultrasound to find fluid and avoid the vessels.

Self-quiz

Q1.

During laparoscopic hernia repair, a hernia sac is found passing through the abdominal wall medial to the inferior epigastric vessels. What type of hernia is it?

Show answer

B

Direct hernias pass through the inguinal (Hesselbach) triangle, medial to the inferior epigastric vessels. Indirect hernias enter the deep ring lateral to them; femoral hernias pass below the inguinal ligament.

Q2.

The inferior epigastric artery arises from which vessel?

Show answer

B

It arises from the external iliac artery just above the inguinal ligament. The superior epigastric comes from the internal thoracic artery.

Q3.

To reduce the risk of injuring the inferior epigastric artery during paracentesis, where should the needle be placed?

Show answer

B

The artery runs deep to the rectus abdominis, so placing the needle lateral to the rectus sheath (typically LLQ) avoids it. Ultrasound guidance further reduces risk.

Q4.

A branch of the inferior epigastric artery sometimes anastomoses with the obturator artery behind the superior pubic ramus and can bleed heavily in pelvic surgery. What is this variant called?

Show answer

A

The pubic branch of the inferior epigastric artery may anastomose with the obturator artery (the "corona mortis"), a source of significant bleeding during pelvic and hernia surgery.

Q5.

A patient on anticoagulation develops a tender, firm lower abdominal wall mass after a coughing fit. The mass stays palpable when she tenses her abdominal muscles. What is the most likely diagnosis?

Show answer

C

A rectus sheath hematoma follows rupture of the inferior epigastric artery, often in anticoagulated patients after coughing or straining. A wall mass stays palpable when the rectus contracts (Fothergill sign), unlike an intra-abdominal mass.

Flashcards

See also