What is the function of the stay apparatus?

What is the function of the stay apparatus?

The stay apparatus is a group of ligaments, tendons and muscles which “lock” major joints in the limbs of the horse. It is best known as the mechanism by which horses can enter a light sleep while still standing up.

Which is a major structure in the stay apparatus?

The key structure of the stay apparatus in the hind limb is the stifle joint. It can be prevented from flexing by fixation of the patella behind a ‘hook’, formed by the medial portion of the femoral trochlea (Fig. 1; see Shuttleworth, 1943; Sack, 1989).

How does passive stay apparatus work?

The passive stay apparatus of the frontlimb enables a horse to rest while standing and use a minimal amount of muscular energy to do so. Instead of using muscles to stabilise joints, this function is performed by tendons and ligaments which do not fatigue to the same extent.

Do horses lock their knees to sleep?

Thanks to specialized legs, however, a horse can lock its knees and fall asleep standing up — without falling over! A horse’s fear of predators also leads it to do most of its sleeping during the day. Just because a horse can fall asleep standing up doesn’t mean it never lies down, though.

What is a check ligament injury in horses?

Injuries to the check ligament are often acute and present as a sudden onset lameness. There is usually heat, pain and swelling around the tendons in the upper cannon area. Chronic cases can also occur and typically present as repeated strains to the ligament over a period of time.

How does the stifle lock in horses?

The stifle locks through one of the three ligaments that attach the patella — or kneecap — to the tibia, slipping into a groove on the inside of the femur (thigh bone).

What is a horse Hip called?

Underlying the stifle area is the stifle joint formed between the large hip bone (femur) which is equivalent to our thigh bone and the tibia. The horse’s tibia is equivalent to our shin bone. The stifle joint somewhat resembles a human knee.

Can a horse recover from a check ligament injury?

Injections of a variety of products into the damaged areas can be undertaken, usually between 2 to 4 weeks post injury. Ligaments are slow to heal and a full recovery can take 6 months or longer.

Can you jump a horse with locking stifle?

Start Treating Locking Stifle in Horses. We’ve covered everything from causes to symptoms, as well as prevention and treatment, so you can give your horse the chance to run, jump, and trot for the rest of their days pain-free and without painful locking up of their stifle joint.

Can a horse with locking stifle be ridden?

Horses that regularly display classic locking stifles and don’t achieve a normal gait after a few strides may not be safe to ride. To detect the problem in a horse being considered for purchase, ride the horse at all gaits and in circles as well as straight lines.

What is a wither on a horse?

Definition of withers 1 : the ridge between the shoulder bones of a horse — see horse illustration. 2 : a part corresponding to the withers in a quadruped (such as a dog) other than a horse.

Can horses see in the dark?

Horses have excellent night vision. Horse eyes are large, they have a large pupil, and this allows ample amount of light to enter even in dark situations. On a night lit by a partial moon or stars, horses can see just as well as people can in full daylight.