09/08/2025
Myology Monday: Serratus Ventralis
The serratus ventralis is one of the most important muscles in your horse’s thoracic sling, the system of muscles that supports the chest in the absence of a clavicle. This muscle group plays a central role in balance, posture, and efficient forward motion.
Anatomical Overview
Origin:
Cervicis: Transverse processes of C4–C7
Thoracis: Ribs 1–8
Insertion: Scapular cartilage and medial scapular surface
Innervation: Long thoracic nerve + cervical ventral branches
Function
Suspends the trunk between the forelimbs
Raises the neck during weight bearing
Assists in respiration
Clinical Insight
The cervical portion is muscular, while the thoracic portion is more tendinous.
Dysfunction can cause poor posture, scapular restriction, or breakdown of thoracic sling function.
Weakness here often shows up as traveling on the forehand, limited range of motion, or uneven balance.
Takeaway
Healthy serratus ventralis = better postural stability, more efficient movement, and less stress on the forelimbs.
