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[ICAR-IVRI] VETERINARY ANATOMY ATLAS

VETERINARY ANATOMY.
FROM STRUCTURE TO FUNCTION.

A free veterinary anatomy learning platform for B.V.Sc., M.V.Sc., DVM and veterinary medicine students worldwide, developed at the Veterinary Anatomy Section, ICAR-Indian Veterinary Research Institute, Bareilly—covering VCI/MSVE and international university curricula through regional anatomy, histology, embryology, comparative biomechanics, clinical notes, quizzes and revision.

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Extensor Carpi Obliquus
/// STANDARD MORPHOLOGY // MYOLOGY
📝 STANDARD DESCRIPTION:
Type: Intrinsic, Forearm (Accessory Extensor)

Origin: Lateral surface of radius

Insertion: Head of medial splint bone (Mc II) or proximal medial aspect of Mc III

Function: Extends carpus; stabilizes medial aspect.
📚 DETAILED DESCRIPTION:
THE MEDIAL CARPAL STABILIZER

Also known as Abductor Digiti I Longus (though digit I is absent), this smaller muscle runs obliquely across the dorsal carpus.

OBLIQUE COURSE: Originates from the lateral radius but courses mediodistally to insert on the medial splint bone (Mc II) or medial aspect of the cannon bone. This oblique line of pull provides medial stabilization to the carpus during extension.

FUNCTION: Assists in carpal extension but with medial vector component, preventing lateral drift of the carpus during loading. Also referenced as the 'medial collateral extensor.'

SURGICAL NOTE: Often encountered during dorsal approaches to the carpal joints; smaller than main ECR but distinct.

// COMPARATIVE ANALYSIS

HORSE Similar; often called Abductor Digiti I Longus.
DOG True abductor of digit II when present.
CLINICAL RELEVANCE
Carpal Sheath Tenosynovitis: Tendon lies within the same synovial sheath as ECR; disease processes involve both.
BIOMECHANICS ENGINE
Comparative Veterinary Biomechanics

The Why of Veterinary Anatomy

Explore the hidden mechanics of why structures are present, absent or modified across domestic and wildlife species—and how each anatomical design supports movement, function and clinical practice.

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