Psoas Minor – Functional Anatomy

Overview

The anatomy of the psoas minor muscle is highly variable. However, when it is present, it can be a significant bodywork concern.

Origin

• bodies of T12-L1 via vertical fascicles

Insertion

• the innominate line of the pubic bone. It connects to the iliac fascia, which connects it broadly to the arch of the pubic bone from the iliac spine to the inguinal tendon

Function

• Psoas minor is strongly connected to the iliac fascia and seems to tense that fascia to support psoas major’s activity.
• In some studies, it is argued that it does several things, from assisting flexion of the pelvis to the positioning of psoas major.

Innervation

• anterior ramus of L1

Anomalies, Etc.

One study shows that it is present in about 87% of white cadavers and 8% of black cadavers. Other studies vary in their claims, often showing that it is present in 25-40% of cadavers.

Wikipedia entry for psoas minor.

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