Name
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