Plantar Interossei

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

Schematic of 4th layer of Plantar Intrinsic Foot Muscles
1: Quadratus Plantae¹
2: Lumbricals
3: Flexor Hallucis Brevis
4: Adductor hallucis
5: Flexor digiti minimi
6: Opponens digiti minimi
7: Plantar interossei
8: Dorsal Interossei

2nd and 4th Layers of Intrinsic Plantar Foot Muscles¹

Overview

Muscle	Origin	Insertion	Innervation	Action
Plantar interossei (3 muscles)	Medial border of 3rd-5th metatarsals	Medial aspect of 3rd-5th proximal phalanx	Lateral plantar n. S2 - S3	3rd-5th Toes: MTP Flexion, MTP Adduction, PIP Extension, DIP Extension

Origin

• Medial border 3-5 MTs¹

Insertion

Medial base of proximal phalanx of 3-5th toe¹

Innervation

Lateral Plantar N. (S2, S3)¹

Action

• MTP 3-5: Flexion¹
• IP 3-5: Extension¹
• Toe 3-5: Adduction to 2nd toe¹

MMT

1.

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