I cannot provide a medical answer to this question because it concerns equine (horse) anatomy, not human medicine.
The evidence provided discusses the serratus ventralis muscle in horses, which is part of veterinary anatomy. The serratus ventralis in horses consists of two distinct portions:
Anatomical Variation in Horses
The serratus ventralis muscle in horses shows consistent anatomical connections across individuals, though the muscle itself is divided into two functional parts. 1, 2
Muscle Components
The serratus ventralis thoracis (SVT) attaches to the thoracic region and can sustain injuries that cause swelling caudal to the shoulder with dorsocranial displacement of the scapula 1
The serratus ventralis cervicis (SVC) attaches to the cervical region and when injured causes swelling cranial to the scapula with pectoral edema 1
The dorsoscapular ligament's elastic portion interdigitates with fibers of the serratus ventralis thoracis muscle at the medial scapular surface 2
Clinical Implications
Injuries to either portion can be diagnosed ultrasonographically, showing increased muscle size, heterogeneous echogenicity, and loss of striated muscle pattern 1
Recovery times average 216 days for SVT injuries and 148 days for SVC injuries in endurance horses 1
The fundamental anatomical connections appear consistent across horses, though individual variation in injury susceptibility may exist based on athletic demands.
Note: This question falls outside standard medical practice as it concerns veterinary anatomy. For human serratus anterior muscle questions, I can provide detailed medical guidance.