3. You might have noticed cats have folds of skin forming what look like small slits on the outer bases of their pinnae. These little structures are formally called the cutaneous marginal pouches, but are more commonly known as Henry’s pockets. Veterinarians are unsure what purpose the pockets serve, if any.
Henry’s pocket is a pretty great anatomical term, and there’s another one for the tufts of fur that grow on the interior of cat’s pinnae—they’re called “ear furnishings” by cat fanciers and breeders.