The sternocephalicus allows the horse to open and close his jaw and bring his head down. If this muscle becomes tight, it can dramatically inhibit the horse’s motion making it difficult to go about everyday tasks. This muscle brings the head down and allows for the head to flex side to side. Moving into the flexor muscles, the brachiocephalicus is the main muscle in the neck and is below the splenius. The hamstring consists of a ton of muscles that are responsible for bringing the hind limb backwards primarily with the stifle and the hock. The glute muscles, the largest muscle in the hind end, is responsible for the power and extension of the pelvis and hip. ![]() This muscle runs and intertwines throughout the entire body all the way to the pelvis while also attaching to each vertebrae in the horse’s back allowing it to flex and extend. Next, we have the latissimus dorsi, which is actually the longest muscle in the body. The splenius is responsible for the flexion of the neck and can actually become overdeveloped quite easily due to improper training. Extensor musclesīeginning with the extensor muscles, first we have the splenius. To gain a better understanding of exactly how extensor and flexor muscles work together to allow our horses to move accordingly, learning exactly which muscles are responsible for which particular movement is key. The muscles along the horse’s abdomen are equally as important to focus on as those along the horse’s topline. Flexor muscles are below the spine and are responsible for bridging the head down, spine up, and are used for collection. The extensor muscles run along the whole topline all the way through the hamstring and are used for extending through the back and lifting the head. ![]() Extensor muscles are a muscle whose contraction extends or straightens a limb or other part of the body whereas flexor muscles are a muscle that serves to flex or bend a part of the body.
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