The abdominal inguinal ring. ("Fascia transversalis" visible near center.)
Femoral sheath laid open to show its three compartments.
In the inguinal region, the transversalis fascia is thick and dense in structure and is joined by fibers from the aponeurosis of the transversus abdominis. It becomes thin as it ascends to the diaphragm and blends with the fascia covering the under surface of this muscle.
Behind, it is lost in the fat which covers the posterior surfaces of the kidneys.
Below, it has the following attachments: posteriorly, to the whole length of the iliac crest, between the attachments of the transversus abdominis and Iliacus; between the anterior superior iliac spine and the femoral vessels it is connected to the posterior margin of the inguinal ligament, and is there continuous with the iliac fascia.
Medial to the femoral vessels it is thin and attached to the pubis and pectineal line, behind the inguinal falx, with which it is united; it descends in front of the femoral vessels to form the anterior wall of the femoral sheath.
Beneath the inguinal ligament it is strengthened by a band of fibrous tissue, which is only loosely connected to the ligament, and is specialized as the iliopubic tract.
This opening is not visible externally, since the transversalis fascia is prolonged on these structures as the internal spermatic fascia.
- Anatomy figure: 35:03-05 at Human Anatomy Online, SUNY Downstate Medical Center - "Layers of the anterior wall."
- Anatomy photo:36:01-0202 at the SUNY Downstate Medical Center - "Inguinal Region, Scrotum and Testes: The Inguinal canal"
- Atlas image: abdo_wall49 at the University of Michigan Health System (look for #2)
- Cross section at UV pembody/body12a