Iliopsoas

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Anterior hip and thigh muscles.
Iliopsoas
Muscle Type
Feature	Fusion of psoas major and iliacus muscles
Origin	Iliac fossa and lumbar spine
Insertion	Lesser trochanter of femur
Action	Flexor of the hip and trunk; lateral flexor of the trunk
Synergists
Antagonists	Gluteus Maximus, Posterior Compartment of Thigh
Spinal innervation	L1, L2, L3
Peripheral Innervation	Femoral Nerve
Vasculature	Medial femoral circumflex artery and iliolumbar artery

The iliopsoas muscle refers to the joined psoas and the iliacus muscles.

Components

Iliopsoas Muscles	Origin	Insertion	Action	Nerve roots	Nerves
Iliacus	Upper two-thirds of the iliac fossa	Base of the lesser trochanter of femur	Flexes and rotates medially thigh	L2 L3	Femoral Nerve
Psoas Major	Transverse processes of L1-5, bodies of T12-L5 and intervertebral discs below bodies of T12-L5	Middle surface of lesser trochanter of femur	Stabiliser and flexor of the hip, lateral flexion of the trunk.	L1 L2 L3	Anterior primary rami of L1-3 nerves (mainly L2)
Psoas Minor	Lateral surface bodies of T12 and L1 vertebrae and intervening intervertebral disc	Passes behind the inguinal ligament to insert into the iliopubic eminence	Weak lumbar spine flexion	L1	Anterior ramus of L1 nerve root