Well it's sort of below the hip and belly bottom.
It originates from the lumber area of the back and extends to the pelvic iliac rim, the pass around the hip through the sciatic notch to the hip.
Lay down on the floor face up and gently press your fingers into your belly between your hip bone and your navel. You will feel it tighten up as you raise your extended leg slightly off the floor.
The Iliopsoas
Iliopsoas or Psoas Major
i THE ILIOPSOAS
quads- rectus femoris
iliopsoas
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.
It's on the superfial anterior side of the femour, in between satorius and pectineus.
bicep- it bends the arm while the triceps straighten the arm.
The flexor muscles are found in the quadriceps as well as the sartorius, iliopsoas, psoas minor, and the pectineus muscles. The rectus femoris is the primary flexor muscle of the quadriceps. The extensor muscles are found in the hamstrings and the gluteus maximus.
It is pronounced ilio-so-as.
gluteus maximus
iliopsoas