Feline anatomy

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Feline Anatomy Sensory Organs All drawings by artist Julia Birmingham

1.   Conjunctiva
2.   Upper eyelid
3.   Iris
4.   Cornea
5.   Lens
6.   Aqueous humor
7.   Lower eyelid
8.   Suspensory ligaments
9.   White sclera
10. Choroid
11. Retina
12. Viterous humor
13. Optic nerve
14. Inferior muscle

The Cat's Eye
When light passes through the pupil, which is in the center of the iris, it stimulates the receptor cells of the retina. Their are two kinds of receptor cells in the retina, rods and cones. Rods are for night vision and black & white images. Cones are for color images. A cat has more rods and fewer cones than humans do and this is why they can see in the dark so well. Like humans, the lens focuses by the changing its shape. This is done by the suspensory ligaments and tiny muscles behind the retina which contract or relax until things are in focus. This process is known as accommodation. The pupil functions to dilate in darkness, allowing more light in, or to constrict in bright light, which protects the sensitive retina. Like humans, cats have binocular vision and see in 3-D.

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Julia Birmingham
	Julia has a 4.0 grade point average and hopes to attend the University of California to major in the Arts. She is especially interested in studying painting and drawing. She is the "publicity person" for her high school and was elected to the Homecoming Court. Julia spent two weeks in France with some lucky classmates to study French. I was very fortunate to be able to hire Julia to illustrate my web pages. What a difference a painting or drawing can make! Thanks Julia!