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
It is pronounced ilio-so-as.
gluteus maximus
iliopsoas
Iliopsoas or Psoas Major
quads- rectus femoris
i THE ILIOPSOAS
fixator
Extension of knee
Quads - iliopsoas, tesnor fascaise latae, sartorious and quadriceps femoris muscles
iliopsoas
yes.