What is the action and innervation of these muscles?
The middle and superficial gluteal muscles are innervated by the cranial and caudal gluteal nerves, respectively, and both of these muscles act to abduct and extend the hip. The biceps femoris and semitendinosis muscles are innervated by the sciatic nerve. Both of these muscles extend the hip and flex the stifle. The biceps femoris muscle may also extend the stifle (cranial portion of muscle) or the hock (caudal portion).
