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At the distal end of the femoral triangle, cut the sartorius muscle transversely. Reflect the inferior portion of the sartorius muscle distally and identify the adductor canal, (low magnification) [tip of the probe is in fascia of the distal portion of the adductor cell]. The adductor canal serves as a conduit through which vessels pass from the femoral triangle to the posterior aspect of the knee. The region on the posterior aspect of the knee is called the popliteal fossa ( see Laboratory Fourteen).

Links and References:
Grant's: 5.16 and 5.24
Netter (1ed.): 470 and 471 (2ed.): 466 and 467
Rohen/Yokochi: 450 and 451