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MOD A - WEEK 3 LEC
Lecture Notes - Eye, Ear and Skin
Question | Answer |
---|---|
The skin is: | largest & one of most important organs of the body |
The 3 structures of the skin are: | -Epidermis -Dermis -Subcutaneous |
Epidermis: | outermost layer of skin |
Dermis: | largely made of connective tissue & network of nerves & nerve-endings |
Subcutaneous: | loose connective tissue & fat; the fat insulates body from heat & cold |
Stratum germinativum: | innermost layer where cells reproduce |
Stratum corneum: | outer layer of epidermis, produces keratin, which is waterproof, provides cells with abrasion-resistance & protective quality |
Accessory structures of the skin are: | 1. Hair 2.Nails 3.Skin glands |
Functions of the skin: | 1.Protect 2.Temp regulate 3.Sense organ activity |
The Sclera: | white of eye |
Choroid: | middle layer of eye; contains dark pigment to prevent scattering of light rays |
The Retina: | innermost layer of eye; contains rods & cones |
Accessory structures of the eye: | 1.Cornea 2.Iris 3.Pupil 4.Lens |
The Cornea: | on front surface of sclera(white) AKA window of eye b/c of transparency |
The Iris: | colored part of eye |
The Pupil: | black center of iris |
The Lens: | directly behind pupil |
The "blind spot" is known as: | optic disc |
The ear is divided into: | 1.External ear 2.Middle ear 3.Inner ear |
External ear: | (2 parts)auricle/pinna & external auditory canal |
Middle ear: | tiny & thin cavity hollowed out of temporal bone |
The organ of Corti is: | organ for hearing; lies in the "snail" cochlea |
An ear disorder: | hearing loss |
An eye disorder: | astigmatism |
A skin disorder: | psoriasis |