Hypogastric sheath is a condensation of
The hypogastric sheath is a pelvic fassia condensation. It lies along the posterolateral pelvic wall and carries the neurovascular bundles towards the pelvic visera. It also provides the pelvic visera suppo. image ref - wikipedia.org
Scarpa's fascia
Colle's fascia
Pelvic fascia
Inferior layer of urigenital diaphragm
Abdomen and pelvis