My assumption is you're talking about the muscle. The iliopsoas is made up of two different muscles; Iliacus (Which got it's name because it attaches to the Iliac Fossa of your pelvic. Ilium meaning "plank or flat" because it is the flat part of your pelvic.) and Psoas Major (Which translates to "Big Loin Muscle"). About halfway down Psoas Major the two attach, eventually sharing the same tendon so the names where joined together. Iliopsoas.
The Iliopsoas
The rectus femoris muscle is a synergist of the iliopsoas. It works together with the iliopsoas to flex the hip joint.
The muscle located between the hip and thigh is called the iliopsoas.
It is pronounced ilio-so-as.
iliopsoas
gluteus maximus
Iliopsoas or Psoas Major
Extension of knee
i THE ILIOPSOAS
Quads - iliopsoas, tesnor fascaise latae, sartorious and quadriceps femoris muscles
The iliopsoas muscle is stretched during hip extension. This muscle group is made up of the psoas major, psoas minor, and iliacus muscles. Stretching the iliopsoas can help improve hip flexibility and relieve hip tightness or discomfort.
fixator