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The saphenous opening is a small defect in the fascia lata that covers the anterolateral surface of the thigh.
It's the opening through which the content of the femoral hernia escapes superficially. The saphenous vein also goes through it as it leaves the superficial fascia.
Have a look at this Gray's Anatomy image:

Head Sleeve Painting Art Tree

Image is in public domain in USA

Surgeons are well aware of the anatomical landmark of the Saphenous opening when they look for small femoral hernia. It's located 1.5 inferolateral to the pubic tubercle.
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