Trunk (thorax, abdomen, back)

Transversalis Fascia

Fascia transversalis

Origin

Covers the inner surface of the transversus abdominis muscle and the entire abdominal wall from within

Insertion

Continues caudally as the iliac fascia and pelvic fascia, and forms part of the deep inguinal ring

Function

Together with the parietal peritoneum, forms the innermost boundary of the abdominal cavity and contributes to the posterior wall of the inguinal canal

Innervation

No independent motor innervation (connective tissue structure, not contractile tissue)

Movement & chain

Forms the innermost elastic lining of the abdominal wall buffering spikes in intra-abdominal pressure (coughing, lifting).

Palpation

Lines the deep surface of transversus abdominis; felt as structural tone above the inguinal ligament.

Clinical

Forms the deep inguinal ring; weakness of the transversalis fascia in Hesselbach's triangle is the primary cause of direct and indirect inguinal hernias.

Segmental innervation

T7–L1 (intercostal, iliohypogastric nerves)

In clinical practice

Wound management post-laparotomy/chest drain and abdominal wall monitoring; support incision site during coughing to prevent wound dehiscence.

Region in the model

Trunk (thorax, abdomen, back)