Lumbrical Muscles of the Hand

Authors

Affiliations

Nate 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

Figure 1: Intrinsic Muscles of the Hand¹

Palmar muscles of the hand (left)2 — Palmar muscles of the hand (left)²

Reading list

Interosseous, Lumbrical, and Abductor Digiti Minimi Muscles³
⁴

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Muscle	Origin	Insertion	Innervation	Action
1st Lumbrical (hand)	Tendon of flexor digitorum profundus	2nd dorsal digital expansion	Median n. C8 - T1	2nd digit: MCP Flexion, PIP & DIP Extension
2nd Lumbrical (hand)	Tendon of flexor digitorum profundus	3rd dorsal digital expansion	Median n. C8 - T1	3rd digit: MCP Flexion, PIP & DIP Extension
3rd Lumbrical (hand)	Tendon of flexor digitorum profundus	4th dorsal digital expansion	Median n. C8 - T1	4th digit: MCP Flexion, PIP & DIP Extension
4th Lumbrical (hand)	Tendon of flexor digitorum profundus	5th dorsal digital expansion	Median n. C8 - T1	5th digit: MCP Flexion, PIP & DIP Extension

Origin

1-2nd Lumbrical: FDP Tendons (radial sides)⁵
3-4th Lumbrical: FDP tendons (bipennate from medial and lateral sides)^{gilroyAtlasAnatomy202?}

Insertion

1st: 2nd digit (DDE)^{gilroyAtlasAnatomy202?}
2nd: 3rd digit (DDE)^{gilroyAtlasAnatomy202?}
3rd: 4th digit (DDE)^{gilroyAtlasAnatomy202?}
4th: 5th digit (DDE)^{gilroyAtlasAnatomy202?}

Innervation

1-2nd Lumbrical: Median N.^5,6
3-4th Lumbrical: Deep Br. of Ulnar N.^5,6
(C8, T1)⁵

Action

2-5 MCP: Flexion⁵
2-5 PIP, DIP: Extension⁵

Notes

Examination

Bunnell-Littler Test
Claw hand

References

Betts JG, Blaker W. Anatomy and Physiology. 2nd ed. OpenStax; 2022. https://openstax.org/details/books/anatomy-and-physiology-2e/?Book%20details

Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/

Donnelly JM, Simons DG, eds. Travell, Simons & Simons’ Myofascial Pain and Dysfunction: The Trigger Point Manual. Third edition. Wolters Kluwer Health; 2019.

Neumann DA, Kelly ER, Kiefer CL, Martens K, Grosz CM. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed. Elsevier; 2017.

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

Yang T, Rui YJ. Innervation of the lumbrical and interosseous muscles in hand: Analysis of distribution of nerve fascicles and quantification of their surface projections. Journal of Plastic Surgery and Hand Surgery. 2022;56(5):310-317. doi:10.1080/2000656X.2021.1981348

Citation

For attribution, please cite this work as:

Yomogida N, Kerstein C. Lumbrical Muscles of the Hand. https://yomokerst.com/The Archive/Anatomy/Skeletal Muscles/Upper Limb Muscles/Hand Muscles/lumbrical_muscles_hand.html