How do horses sleep standing up?

THE EQUINE STAY APPARATUS

In my junior year at Centenary University, I studied and sculpted major anatomical structures of the equine musculoskeletal system. I donated this sculpture to my university’s equestrian center.

Horses can sleep standing up because of a locking mechanism in their hind legs involving their patellar ligaments and stifle joints. The other muscles in this sculpture support the horse’s trunk, head, neck, ribs, and limbs.

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Anatomy & Science