psoas minor

Introduction

Absent in about 40% of individuals.

Origin

• bodies of the vertebrae & intervertebral disks from T12 to L1

Insertion

• iliopubic eminence via iliopectineal arch (iliac fascia)

Action

• assists in flexion of the lumbar spine

Innervation

• lumbar plexus

More general terms

• skeletal muscle (voluntary muscle)