5.10 Muscles of the Hip
Hip Flexor Group, Gluteus Medius, and Gluteus Maximus

Hip Flexor Group
Action: Flexion of the hip.
Made up of the iliacus and psoas major.

Gluteus Maximus
Action: Extension and external rotation of the hip.
The gluteus maximus (‘butt muscle’) is named for its size and location. Gluteus refers to its location within the gluteal region, and maximus refers to it being not only the largest muscle in the gluteal region but also the largest muscle in the human body.

Gluteus Medius
Action: Abduction of the hip.
The gluteus medius is named for its location. Gluteus refers to its location within the gluteal region, and medius (Latin for ‘middle’) refers to it being in the middle of the gluteus maximus and minimus.