Follow and Like Us:

Extensor Digitorum Longus Muscle Anatomy: Origin, Insertion, Action

Extensor Digitorum Longus Muscle Anatomy Study: Origin, Insertion, Action and Innervation

Extensor Digitorum Longus Origin, Insertion, Action, Innervation
Origin: Lateral condyle of the tibia, the proximal two-thirds of the medial surface of the fibula, the adjacent anterior surface of the interosseous membrane, the anterior intermuscular septum, and the septum between it and tibialis anterior.
Insertion: Divides into four slips and inserts at the base of each of the lateral four proximal phalanges. Each tendon then divides into three slips: an intermediate slip which attaches to the base of the middle phalanx, and two collateral slips which attach to the base of the distal phalanx.
Action: Extension of the four lateral toes, assists with dorsiflexion of the foot at the ankle.
Innervation: Deep Peroneal nerve (L5 – S1 )
Blood Supply: Branches from the anterior tibial artery.

Synergist: Extensor hallucis longus, Tibialis anterior, Peroneus tertius

For Pain and Symptom Information See: Extensor Digitorum Longus Top of the Foot Pain

Primary Actions of the Extensor Digitorum Longus:

1. Extension of the four lateral toes at the proximal interphalangeal joints

  • Agonists: Extensor Digitorum Brevis
  • Antagonists: Flexor Digitorum Longus, Flexor Digitorum Brevis

2. Extension of the four lateral toes at the metatarsophalangeal joints

  • Agonists: Extensor Digitorum Brevis
  • Antagonists: Flexor Digitorum Longus, Flexor Digitorum Brevis, Flexor Digiti Minimi

3. Flexion of the four lateral toes at the distal interphalangeal joints

  • Angonists: None
  • Antagonists: Flexor Digitorum Longus

Secondary Action of the extensor digitorum longus:

1. Assists with dorsiflexion of the foot at the ankle

  • Agonists: Tibialis Anterior
  • Antagonists: Gastrocnemius, Soleus

basic_clinical_massa

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 recommended treatments for each muscle.


References:

The Trigger Point Therapy Workbook – Claire Davies, Amber Davies, and David G. Simons

Basic Clinical Massage Therapy: Integrating Anatomy and Treatment – James H. Clay and David M. Pounds

Trigger Point Therapy for Myofascial Pain – Donna Finando and Steven Finando

Massage Therapy Principles and Practice – Susan Salvo

Theory & Practice of Therapeutic Massage – Mark Beck

 

Leave a Comment