Pes anserinus

Image:Gray434.png Image:Gray788.png Pes anserinus ("goose's foot") is the anatomic term used to describe two different structures:

The term describes the insertion of the conjoined tendons of (from anterior to posterior) the sartorius, gracilis and semitendinous muscles onto the anteromedial proximal tibia bone. The conjoined tendon lies superficial to the tibial insertion of the medial collateral ligament (MCL) of the knee and is a major cause of chronic knee pain and weakness (pes anserinus bursitis).
It is also the term for the branch point of the facial nerve (extratemporal) after it leaves the stylomastoid foramen. This division takes place within the parotid gland. Commonly, it divides into the temporozygomatic and cervicofacial branches (several variations).