The short posterior ciliary arteries are small blood vessels that branch off from the ophthalmic artery. They supply blood to the posterior part of the eye, particularly the choroid and the optic nerve. These arteries play a crucial role in maintaining the health and function of the eye by providing essential nutrients and oxygen. Typically, there are about 6 to 12 short posterior ciliary arteries in each eye. They penetrate the sclera, the outer layer of the eye, and form a network that ensures adequate blood flow. Proper functioning of these arteries is vital for preventing conditions like ischemia and supporting overall visual health.