Musculus subclavius
The subclavius is a small muscle in the pectoral region. The subclavius is a small muscle in the pectoral region. It originates from the cranial surface of the first rib and costal cartilage and inserts on the lateral humerus (via fascia). Its actions are to stabilize the pectoral girdle and to adduct and retract the forelimb. It is innervated by the subclavian nerve from the brachial plexus (roughly C5-C6). Horses lack a true clavicle.
Origin: Cranial surface of the first rib and costal cartilage
Insertion: Lateral humerus (via fascia)
Action: Stabilizes the pectoral girdle; adducts and retracts the forelimb
Innervation: Subclavian nerve from the brachial plexus (C5-C6)
Isolated injury is uncommon. Relevant mainly as part of the thoracic sling and pectoral musculature.
## Overview Pectoral region pain is discomfort where the lower neck meets the chest, often involving the muscles of the thoracic sling. It produces sensitivity on palpation, a shortened forelimb stri
Weakness of the serratus ventralis allows the thorax to drop between the forelimbs, creating a hollow behind the withers and affecting the entire posture of the horse. This is the core of the 'core' i
Not a structure of primary practical concern for owners under normal circumstances.
## Overview Pectoral region pain is discomfort where the lower neck meets the chest, often involving the muscles of the thoracic sling. It produces sensitivity on palpation, a shortened forelimb stride, and reluctance to extend the forelimb fully. It may indicate strain of the sling mechanism that supports the trunk between the forelimbs. ## Causes Muscle strain, poor saddle or girth fit, or compensatory issues. ## Diagnosis Palpation and gait evaluation. Imaging if deeper injury is suspected. ## Treatment Rest, anti-inflammatories, physiotherapy, and correction of tack fit. ## Recovery and Prognosis Good for soft-tissue pain. ## Prevention Proper conditioning and tack fit. Signs include: sensitivity on palpation of the lower neck/chest junction; shortened forelimb stride; reluctance to extend the forelimb
Weakness of the serratus ventralis allows the thorax to drop between the forelimbs, creating a hollow behind the withers and affecting the entire posture of the horse. This is the core of the 'core' in equine rehabilitation. Signs include: Hollow behind the withers; withers appear more prominent than they should; horse falls on the forehand; heavy in the hand; difficulty engaging the hindquarters; stumbling on the forehand.; Low withers appearance; stumbling and tripping; heavy on the forehand; reduced shock absorption (jarring trot); forelimb lameness from increased concussive loading.; Stumbling; withers appear to sink between the shoulders; premature fatigue during work; poor shock absorption at the trot.
Isolated injury is uncommon. Relevant mainly as part of the thoracic sling and pectoral musculature.
Not a structure of primary practical concern for owners under normal circumstances.
See the Subclavius on our interactive 3D horse model. Open 3D Model