The lids of the eye close in such a way as to leave a three-cornered canal between them and the surface of the eyeball. Labels: b, the surface of the front of the eye; a, the edges of the two lids.

Eye Lid

The lids of the eye close in such a way as to leave a three-cornered canal between them and the surface…

Section through the closed left eye.1. Lifting muscle 2. Upper Straight Muscle 3. Optic Nerve 4. Fatty Cushion 5. Lower straight muscle 6. Vitrous Humour 7. Lower cross muscle 8. Lower Eyelid 9. Upper eyelid 10. Crystalline lens

Eyeball

Section through the closed left eye. 1. Lifting muscle 2. Upper Straight Muscle 3. Optic Nerve 4. Fatty…