The Human Eye: Structure (Edexcel IGCSE Biology: Double Science)
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The Human Eye: Structure
- The eye is a highly specialised sense organ containing receptor cells that allow us to detect the stimulus of light
- The retina of the eye contains two types of receptor cells:
- Receptor cells that are sensitive to light, known as rods, and receptor cells that can detect colour, known as cones
The eye
Functions of the Parts of the Eye Table
- Other structures of the eye include:
- The ciliary muscle - a ring of muscle that contracts and relaxes to change the shape of the lens
- The suspensory ligaments - ligaments that connect the ciliary muscle to the lens
- The sclera - the strong outer wall of the eyeball that helps to keep the eye in shape and provides a place of attachment for the muscles that move the eye
- The fovea - a region of the retina with the highest density of cones (colour detecting cells) where the eye sees particularly good detail
- The aqueous humour - the watery liquid between the cornea and the lens
- The vitreous humour - the jelly-like liquid filling the eyeball
- The choroid - a pigmented layer of tissue lining the inside of the sclera that prevents the reflection of light rays inside the eyeball
- The blind spot - the point at which the optic nerve leaves the eye, where there are no receptor cells
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