Name

# Iliopsoas

Pronunciation

(il-e-o-SO-us)

Origin/Proximal Attachment

Iliacus:

Inner surface of upper iliac fossa

anterior inferior iliac spine (AIIS)

anterior capsule of hip joint

Psoas Major:

vertebral bodies of T12-L4 (& discs)

transverse processes of L1-4

Insertion/Distal Attachment

Iliopsoas tendon to the lesser trochanter of the femur

medial aspect of linea aspera

Action/Relevance

Flex hipExternally rotate hip

Innervation

Iliacus: Femoral nerve (L2-4)

Psoas Major: ventral rami of spinal nerves (L1-4)

Notes

Iliacus: Large fan shaped m. lying lateral to the psoas.

Iliacus portion inserts on lateral side of psoas tendon

Psoas: Long thick m passes under inguinal lig