anatomy of the eye

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anatomy of the eye. anatomy of the eye. the eye: the eyes are the organs of the special sense of sight. they sit in the orbit of the skull which provides them with positional protection. humans have two eyes which work together, this is known as binocular vision. the eyeball. the eye ball is globe shaped and made of three main layers: an outer layer which is fibrous and protective a middle layer which contains many blood vessels an inner layer known as the optic part of the eye consider which parts of the eye can be seen. can you name any parts of the eyeball? what differences can you see between your eyes and those of people around you? suggestion teaching notes: encourage students to look into each others eyes or to look at their own in hand mirrors. get them to describe the differences in colour they see …

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cuss whether the size change occurs in one or both eyes. can students think of any clinical contexts when this may be used (such as in hospital). discuss what may cause changes in pupil size other than light such as flight/fight, drugs and head injury. * constriction a circular pattern of muscle (the sphincter pupillae muscle) when contracted decreases the size of the pupil. this is constriction. this happens in light situations. suggestion teaching notes: with high level students the concept of a reflex arc can be discussed and the neural pathways involved with pupil size changes. * dilation a radial pattern of muscle (the dilator pupillae muscle) when contracted increase the size of the pupil. this is dilation. this happens in dark situations. the inner layer of the eyeball the inner layer of the eyeball is known as the retina which is sensitive to light. on the retina there …

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$rcle of muscle surrounding the pupil that changes the size of the pupil * the iris is what we refer to when we speak of the colour of someone’s eyes pupil sclera the tough, opaque cover of the eyeball that forms the “white” of the eye and helps it keep its shape w * there are six muscles attached to the sclera rw,, that allow the eye to move up and down and side to side cornea acolourless, transparent covering on the front of the eye that helps focus light on the retina. 80% of light refraction occurs here. lined with rhodopsin = ner segment renter plamen, outer segment srna . poplin | connecting en me segnent ——— inner segment, ——$— outer membrane nucleus synaptic terminal at frms asiopse ‘synaptic body rod cell cone cell anterior chamber cornea (aqueous humour) posterior chamber uvea iris ciliary body suspensory ligament of lens …$

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anatomy of the eye. anatomy of the eye. the eye: the eyes are the organs of the special sense of sight. they sit in the orbit of the skull which provides them with positional protection. humans have two eyes which work together, this is known as binocular vision. the eyeball. the eye ball is globe shaped and made of three main layers: an outer layer which is fibrous and protective a middle layer which contains many blood vessels an inner layer known as the optic part of the eye consider which parts of the eye can be seen. can you name any parts of the eyeball? what differences can you see between your eyes and those of people around you? …

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