Psoas Minor Muscle

Authors

Affiliations

Nathaniel Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Muscle	Origin	Insertion	Innervation	Action
Psoas Minor	T12, L1 vertebrae (lateral aspect) and IVD	Pectineal Line Iliopubic ramus Iliac fascia Inguinal ligament	Spinal nn. L1 - L3	Trunk: Weak flexion

Origin

T12, L1 vertebrae and intervertebral disk (lateral surfaces)¹

Insertion

Pectineal line, iliopubic ramus, iliac fascia; lowermost fibers may reach inguinal lig.¹

Innervation

L1–L2 (L3) spinal nn.¹

Action

Weak flexor of the trunk¹

Overview

Found in only 50% of the population¹

“The psoas minor, present in approximately 50% of the population, is often found on the superficial surface of the psoas major (see Fig. 31.19). It is not a muscle of the lower limb. It originates, inserts, and exerts its action on the abdomen”¹

Stretches

• 3D hip flexor stretch

References

1.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.