Superficial arteries
These vessels originate from the femoral artery (a. femoralis) immediately below the inguinal ligament. They run within the subcutaneous adipose tissue and supply blood to the outer layers of the abdominal wall.
- Superficial epigastric artery (a. epigastrica superficialis): courses superiorly toward the umbilicus. In this region, it forms anastomoses with branches of the superior epigastric artery.
- Superficial circumflex iliac artery (a. circumflexa ilium superficialis): runs along the inguinal ligament. Its destination is the anterior superior iliac spine (spina iliaca anterior superior) and the skin of this area.
- External pudendal arteries (aa. pudendae externae): give rise to inguinal branches (rr. inguinales) that supply the tissues of the pubic and inguinal regions.
Deep arteries
The deep vascular layer supplies the muscular framework and fascia. Key arteries of this tier include:
- Superior epigastric artery (a. epigastrica superior). It is a terminal branch of the internal thoracic artery. It penetrates posteriorly into the rectus sheath (at the level of the VII or VIII rib cartilages). Descending toward the umbilicus, it anastomoses with the inferior epigastric artery.
- Inferior epigastric artery (a. epigastrica inferior). Originates from the external iliac artery. Its topography is notable for coursing medial to the spermatic cord and then ascending toward the umbilicus within the preperitoneal tissue. It is this vessel that raises the peritoneum, forming the lateral umbilical fold.
- Deep circumflex iliac artery (a. circumflexa ilium profunda). It also branches off the external iliac artery. It runs along the iliac crest in the fascial space between the peritoneum and the transversalis fascia.
- Additional sources. The blood supply also involves five lower intercostal arteries (aa. intercostales) and, typically, four lumbar arteries (aa. lumbales).
Venous system and anastomoses
The veins of the anterior abdominal wall are divided into superficial and deep. The deep veins run in pairs alongside the corresponding arteries. The superficial veins are much more developed: they form dense networks and plexuses in the subcutaneous tissue (especially around the umbilicus) and abundantly anastomose with one another.
The venous network provides vital connections between the basins of the major veins:
- Caval-caval anastomoses. Connect the superior and inferior venae cavae. Superficial drainage into the superior vena cava system occurs via the thoracoepigastric veins (vv. thoracoepigastricae), which empty into the axillary vein. Deep drainage is carried out via the superior epigastric veins (vv. epigastricae superiores), which drain into the subclavian veins.
- Portocaval anastomoses. Provide a connection between the abdominal venous network and the portal vein system. This connection is established via the paraumbilical veins (vv. paraumbilicales), which course within the falciform ligament of the liver.
Clinical significance: Caput Medusae sign
The anatomy of venous anastomoses has prominent clinical manifestations in pathologies. If blood outflow through the inferior vena cava or portal vein is impeded (e.g., in portal hypertension), pressure in the system rises sharply.
Compensatory dilation of the subcutaneous veins of the anterior abdominal wall develops. These blood-engorged vessels show through the skin as tortuous, serpentine plexuses radiating from the umbilicus. Because of their visual resemblance to the snakes on the head of the mythical Gorgon, this sign is called Caput Medusae (Caput Medusae).
Briefly: answers to topical questions
Which layers of the anterolateral abdominal wall are supplied by the deep circumflex iliac artery?
The deep circumflex iliac artery (a. circumflexa ilium profunda) supplies the inferolateral parts of the anterolateral abdominal wall. Sources do not provide an exact list of supplied layers, but they indicate the vessel's topography. The artery runs in the tissue layer located between the peritoneum and the transversalis fascia, coursing along the iliac crest.
Which nerves innervate the anterolateral abdominal wall?
The anterolateral abdominal wall is innervated by branches of the lower intercostal nerves and nerves of the lumbar plexus.
- Intercostal nerves (nn. intercostales VII–XII) — innervate the skin of the epigastric, umbilical, and hypogastric regions, as well as the muscles and peritoneum.
- Iliohypogastric nerve (n. iliohypogastricus) — branches out in the inguinal and pubic regions.
- Ilioinguinal nerve (n. ilioinguinalis) — emerges from the inguinal canal and innervates the skin of the scrotum or labia majora.
These nerves run between the internal oblique and transversus abdominis muscles, and then penetrate the rectus abdominis sheath.
What are the boundaries of the anterolateral abdominal wall?
The boundaries of the anterolateral abdominal wall are defined by the following bony and muscular landmarks.
- Superior boundary — xiphoid process of the sternum and costal arches up to the 10th ribs.
- Inferior boundary — inguinal ligaments, iliac crests, and pubic symphysis.
- Lateral boundaries — posterior axillary lines, which serve as conventional landmarks separating the anterolateral wall from the lumbar region.
Which muscles form the framework of the anterolateral abdominal wall?
The muscular framework of the anterolateral abdominal wall is formed by five pairs of muscles divided into two groups.
The anterior group is located on either side of the linea alba:
- Rectus abdominis muscle (m. rectus abdominis) — narrows inferiorly, featuring tendinous intersections.
- Pyramidalis muscle (m. pyramidalis) — a small muscle that tensions the linea alba.
The lateral group forms three layers (from superficial to deep):
- External oblique muscle (m. obliquus externus abdominis) — fibers run superiorly to inferiorly and laterally to medially.
- Internal oblique muscle (m. obliquus internus abdominis) — fibers run perpendicular to the external oblique.
- Transversus abdominis muscle (m. transversus abdominis) — fibers have a horizontal direction.
To remember the Caput Medusae sign, imagine that during a portal vein obstruction, blood "seeks a way out" through the umbilicus, causing the veins to swell and twist beneath the abdominal skin like snakes on the head of the mythical Gorgon.
Class and exam questions
Which arteries form an anastomosis at the umbilical level?
At the umbilical level, the superior epigastric artery (branch of the internal thoracic) and the inferior epigastric artery (branch of the external iliac) anastomose.
Which structure forms the lateral umbilical fold?
The lateral umbilical fold is formed by the inferior epigastric artery running within the preperitoneal tissue.
Through which veins is the connection with the portal vein system established?
The connection with the portal vein (portocaval anastomosis) occurs via the paraumbilical veins located within the round ligament of the liver.
Where does the outflow via the thoracoepigastric veins occur?
The thoracoepigastric veins drain blood from the superficial layers of the abdomen and empty into the axillary vein.
What else to study on this topic
- Topography of superficial vessels in the inguinal ligament area
- Course of the superior epigastric artery within the rectus sheath
- Mechanism of portal hypertension development and engagement of portocaval anastomoses
- Relationship between the inferior epigastric artery and the spermatic cord
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