Dorsal 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
Dorsal interossei (4 muscles)	1-5 metatarsals (two heads on opposing sides)	Medial aspect of 2nd proximal phalanx base Lateral aspect of 2nd-4th proximal phalanx bases 2-4 Toes at Dorsal aponeurosis	Lateral plantar n. S2 - S3	2nd-4th Toes: MTP Flexion, MTP 3-4 abduction, PIP Extension, DIP Extension

Origin

1st-5th metatarsals (two heads on opposing sides)¹

Insertion

• 1st interosseous: 2nd proximal phalanx (medial base)¹
• 2-4 interosseous:
  • 2-4 proximal phalanges (lateral base)¹
  • 2-4 toes at dorsal aponeurosis¹

Innervation

Lateral Plantar N. (S2, S3)¹

Action

• MTP 2-4: Flexion¹
• IP 2-4: Extension¹
• Toes 3-4: Abduction from 2nd toe¹

MMT

1.

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