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"The three layered system described by Warren and Marshall has been accepted as the correct way to refer to the layers on the medial side of the knee [3]. The superficial layer (layer 1) also called the crural or investing fascia, contributes very little to patellar stability and is conjoined to layer 2 antero-superiorly and antero-inferiorly near the patella [4]. Layer 2 is composed of the superficial medial collateral ligament (MCL), the medial patellofemoral ligament and its oblique decussation from the upper MCL and the patellotibial ligament which is conjoined with layer 1. Layer 3 is composed of the deep MCL, the joint capsule and the medial patellomeniscal ligament [5]. Together, all three layers from the medial retinaculum"

Reference
file:///Users/yoshihikotsumekawa/Downloads/1758-2555-1-17.pdf