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Related Concept Videos

Bones of the Upper Limb: Ulna01:15

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...
Bones of the Upper Limb: Radius01:09

Bones of the Upper Limb: Radius

The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a short...
Muscles that Move the Forearm01:16

Muscles that Move the Forearm

The muscles that move the forearms can be divided into four groups: forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint, while the pronators and supinators act on the radioulnar joints.
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...
Muscles of the Forearm that Move the Hand and Fingers01:16

Muscles of the Forearm that Move the Hand and Fingers

The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...
Muscles of the Leg that Move the Foot and Toes01:28

Muscles of the Leg that Move the Foot and Toes

The human leg comprises an intricate system of muscles that facilitate the movement of feet and toes. Within this system, the muscles are categorized into the anterior, lateral, and posterior compartments, each with a unique set of muscles carrying out specific functions.
Anterior Compartment
The anterior compartment includes muscles that contribute to the dorsiflexion of the foot. This compartment houses the tibialis anterior, extensor hallucis longus, and extensor digitorum longus muscles.
Spinal Nerves: Plexus I01:22

Spinal Nerves: Plexus I

Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
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The cervical plexus, formed by the anterior rami of the first four...

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Related Experiment Video

Updated: Jul 12, 2026

Setup for the Quantitative Assessment of Motion and Muscle Activity During a Virtual Modified Box and Block Test
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Recognition of the flexor digitorum accessorius longus.

Alan R Deroy1, Chad C Clause, Eric S Baskin

  • 1Temple University School of Podiatric Medicine, Philadelphia, PA 19107, USA.

Journal of the American Podiatric Medical Association
|September 19, 2002
PubMed
Summary

A rare flexor digitorum accessorius longus muscle variant was observed in a cadaver. This anatomical finding highlights potential clinical implications for foot and ankle surgery.

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Intact Short, Intermediate, and Long Skeletal Muscle Fibers Obtained by Enzymatic Dissociation of Six Hindlimb Muscles of Mice: Beyond Flexor Digitorum Brevis
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Setup for the Quantitative Assessment of Motion and Muscle Activity During a Virtual Modified Box and Block Test
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Intact Short, Intermediate, and Long Skeletal Muscle Fibers Obtained by Enzymatic Dissociation of Six Hindlimb Muscles of Mice: Beyond Flexor Digitorum Brevis
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Area of Science:

  • Anatomy
  • Podiatric Medicine
  • Surgical Anatomy

Background:

  • The flexor digitorum accessorius longus (FDAL) is an accessory muscle in the foot.
  • Its presence and variations can impact biomechanics and surgical procedures.

Purpose of the Study:

  • To describe a specific observation of the FDAL muscle during a podiatric surgery course.
  • To review existing literature and discuss the clinical significance of this muscle variant.

Main Methods:

  • Observation of a cadaveric foot during a surgical anatomy course.
  • Detailed examination of the muscle's insertion point.
  • Literature review on the flexor digitorum accessorius longus muscle.

Main Results:

  • The FDAL muscle was identified, with its insertion noted on the flexor digitorum longus tendon before its digital division.
  • The muscle's origin could not be determined due to the cadaver's preparation.

Conclusions:

  • This case provides a specific anatomical description of an FDAL muscle variant.
  • Understanding such variations is crucial for accurate diagnosis and effective treatment in foot and ankle surgery.