Cranial Floor Bones of the Skull
Psoas Major Muscle
Psoas Major (Musculus Psoas Major)
Attachments of Psoas Major : Origin and Insertion
Origin (proximal) attachments:
a. Bodies and bases of tranverse processes of L1-L5.
Insertion (distal) attachments:
a. Lesser trochanter of femur.
Actions of Psoas Major on the thigh (femur) :
a. Flexes thigh at the hip.
b. Laterally rotates thigh at the hip.
Nerve to muscle and its spinal segment:
Branches (ventral rami) of lumbar plexus (L1-L3).