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eye 2
| Question | Answer |
|---|---|
| Eyebrows | Protective structure; prevents perspiration from running into the eyes; reduces glare in bright light; forms facial expressions |
| Eyelashes | Richly innervated so that the slightest touch or puff of air triggers blinking; stiff hairs in the edges and corners of the upper and lower eyelids |
| Lens | Slightly flattened sphere located posterior to the iris and pupil; focuses light on the retina |
| Iris | Colored portion of the eye; determines how much light can pass through the pupil |
| Vitreous humor | Gelatinous material in the posterior cavity; presses the retina against the choroid; maintains the shape of the eyeball |
| Retina | Neural layer of the eyeball; innermost layer of the eyeball; contains photoreceptors cells |
| Ciliary body | Contains a ring of smooth muscle that surrounds the lens; changes the shape of the lens |
| Macula lutea/Fovea centralis | the yellowish region on the retina; Fovea centralis is an area in the retina that has a high density of photoreceptor therefore it allows for extremely detailed vision |
| Pupil | Opening through which light enters the eye |
| Aqueous humor | Fluid secreted by the ciliary body that fills the anterior cavity |
| Optic nerve | Nerve that exits out of the back of the eye at the optic disc |
| Lacrimal sac | Collects the lacrima from the lacrimal canaliculi |
| Optic chiasm | X shaped structure where stimuli from each half of the visual field are segregated so that they reach the opposite hemisphere of the brain |
| The suspensory ligaments | Connects the ciliary body to the lens; aids in changing the shape of the lens |
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