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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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Subscapularis
/// STANDARD MORPHOLOGY // MYOLOGY
📝 STANDARD DESCRIPTION:
Type: Intrinsic, Scapulohumeral (Medial)

Origin: Subscapular fossa (entire medial scapular surface)

Insertion: Medial (lesser) tubercle of humerus

Function: Adducts arm; extends shoulder; functions as medial collateral ligament.
📚 DETAILED DESCRIPTION:
THE MEDIAL COLLATERAL LIGAMENT

A massive multipennate muscle filling the entire subscapular fossa on the medial aspect of the scapula. It is the largest and most powerful medial stabilizer of the shoulder.

PENNATE ARCHITECTURE: Multipennate structure allows for powerful contraction over short distances—ideal for stabilizing rather than sweeping movements.

FUNCTIONAL ANALOGY: Functions as the medial collateral ligament of the shoulder joint, preventing abduction (movement away from midline) while also being capable of active adduction (pulling toward midline).

MEDIAL STABILIZATION: Provides the essential counterforce to the infraspinatus laterally. Together, these muscles cradle the humeral head within the glenoid cavity during weight bearing.

NEURAL SUPPLY: Subscapular nerve.

// COMPARATIVE ANALYSIS

HORSE Similar massive size and function; critical for weight bearing.
DOG Part of true 'rotator cuff' foursome.
CLINICAL RELEVANCE
Medial Instability: Unlikely to be injured alone; usually involved in complete brachial plexus avulsions.
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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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