Foot Lumbrical Muscles

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 2nd layer of Plantar Intrinsic Foot Muscles¹
1: Quadratus Plantae
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
Lumbricals (Foot)	FDL tendons (medial borders)	2-5th toes at dorsal aponeurosis	Medial Plantar n. Lateral Plantar n. S2 - S3	2nd-5th Toes: MTP Flexion, PIP Extension, DIP Extension

Origin

Medial borders of tendons of FDL¹

Insertion

Dorsal aponeurosis of toes 2-5¹

Innervation

• 1st lumbrical (2nd toe): Medial Plantar N. (S2, S3)¹
• 2-4 Lumbricals (3rd-5th toes): Lateral Plantar N. (S2, S3)¹

Action

• MTP 2-5: Flexion¹
• IP 2-5: Extension¹
• Toes 2-5: Adducts toes 2-5 towards big toe¹

MMT

1.

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