Which of the following muscles attaches to the pes anserine?

The muscle that attaches to the pes anserine is the semitendinosus. The pes anserine, also known as the "goose's foot," is a conjoined tendon on the medial aspect of the knee, formed by the tendons of three muscles: the sartorius, gracilis, and semitendinosus. This anatomical configuration allows these muscles, which originate from various locations, to collectively attach at a single point on the tibia.

The semitendinosus muscle, originating from the ischial tuberosity, functions in flexing the knee and medially rotating the hip. Its position and function make it critical for activities involving knee flexion and stability. Understanding the attachments and roles of these muscles helps in diagnosing and treating injuries related to the knee and hip.