This Small Metal Arm Holds the Power to Start an Engine

Anatomy Standard on Instagram: "We are pleased to present newly created deep muscles of the hip. Revealed through internal and external rotation, these layers are rarely seen, yet constantly at work. Most people recognize the movement. Few can name what’s actually doing it. How many of the visible muscles can you identify? #anatomystandard #hipanatomy #deephipmuscles #hiprotation #lowerlimbanatomy"