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(Last Updated On: June 26, 2019)

Lumbricals Muscles of the Hand Origin, Insertion, Action

Muscle Anatomy of the Hand Lumbricals

Origin: From the tendons of flexor digitorum profundus.

First and second lumbricals: radial sides of the palmar surfaces of the tendons of the second and  third digit, respectively
Third lumbrical: adjacent sides of the tendons of the third and fourth digits.
Fourth lumbrical: adjoining sides of the tendons of the fourth and fifth digits.
Insertion: Each to the radial surface of the extensor apparatus of the same digits as the tendons of origin
Actions: Flexion of the digits at the metacarpophalangeal joints
Innervation: First and second lumbricals: median nerve (C8, T1). Third and fourth lumbricals: ulnar nerve (C8, T1)
Blood Supply: Deep palmar arch of the radial artery

Lumbricals Hand Muscles Origin, Insertion, Action, Innervation

Hand Lumbricals Actions With Agonists and Antagonists

Primary Actions of the Hand Lumbricals

1. Flexion of the digits at the metacarpophalangeal joints

Agonists:

  • Dorsal Interossei
  • Palmar Interossei
  • Flexor Digiti Minimi
  • Flexor Digitorum Superficialis
  • Flexor Digitorum Profundus

  Antagonists:

  • Extensor Digitorum
  • Extensor Indicis
  • Extensor Digiti Minimi

 

Secondary Actions of the Hand Lumbricals:

1. Assists with extension of the digits at the proximal interphalangeal joints

  Agonists:

  • Dorsal Interossei
  • Palmar Interossei
  • Extensor Digitorum
  • Extensor Indicis
  • Extensor Digiti Minimi

  Antagonists:

  • Flexor Digitorum Superficialis
  • Flexor Digitorum Profundus

2. Assists with extension of the digits at the proximal interphalangeal joints

  Agonists:

  • Dorsal Interossei
  • Palmar Interossei
  • Extensor Digitorum
  • Extensor Indicis
  • Extensor Digiti Minimi

  Antagonists:

  • Flexor Digitorum Superficialis
  • Flexor Digitorum Profundus

3. Assists with extension of the digits at the distal interphalangeal joints

  Agonists:

  • Dorsal Interossei
  • Palmar Interossei
  • Extensor Digitorum
  • Extensor Indicis
  • Extensor Digiti Minimi

  Antagonists:

  • Flexor Digitorum Profundus

Information about the cause and effect of opponens pollicis pain:

Lumbrical Muscles of Hand Pain and Symptoms

 

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Recommended Anatomy Books:

The Anatomy Coloring Book is one of the best study and reference books for beginning anatomy students. The diagrams are clearly labeled and allow you to see the relationship and placement of the various structures of the body. You will also be surprised by how the act of coloring will help with recall. But this is not just a beginners book, it is also great for practitioners and therapists to have on hand to use with clients and patients to use as a visual reference.

The Trail Guide To The Body is another excellent book to help you learn the musculature of the human body. Though the book is geared toward massage therapists and physical therapist assistants, the book with its illustrations and text helps anyone gain a thorough understanding of the human musculoskeletal system and movement. I highly recommend this book for anyone studying anatomy and believe that MTs, PTAs, and teachers of body movements should have this book in their possession. I also highly recommend this book for the layperson who wants to gain an understanding of the muscle, skeletal system and how our bodies move. This book will not disappoint!

Out of the scores of books in my office, Basic Clinical Massage Therapy is by far the most referenced book in my library. The musculoskeletal system is overlaid on human models allowing you to learn the precise location, origin, and insertions of each muscle. The models are pictured in various poses throughout the book which also helps you visualize muscles in motion and their actions relationship with the skeletal structure and other muscles. Though it is written for massage therapists, it is an excellent book for anyone who wants to learn about the muscular system. MT's will benefit from the recommended treatments for each muscle.

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