Eye

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Eye

  1. 1. Accessory structures Eyebrows  - facial expressions, prevent glare and perspiration in eyes Eyelids (palpebrae)  - protect eye  - allow sleep  - separated by palpebral fissure  - medial & lateral commissures (canthi)  - contain tarsal plates & tarsal glands Conjunctiva  - transparent mucous membrane that secretes film to prevent eye from drying
  2. 2. Tears!
  3. 3. The Six Extrinsic Muscles of the EyeOblique: Superior and InferiorRectus: Lateral and Medial, Superior and Inferior
  4. 4. Anatomy of the Eye Three layers (Tunics) – Outer fibrous layer (Tunica Fibrosa)  Sclera : dense CT  Cornea : transparent, admits light – Middle vascular layer (Tunica Vasculosa)  Choroid : vascular  Ciliary body : muscular ring around lens – Secretes aqueous humor – Supports iris & lens – Inner layer (Tunica Interna)  Retina : contains fovea centralis (detailed images) – Rods (black & white, night vision) – Cones (color, day vision) – Optic nerve (not receptors, blind spot)
  5. 5. Anatomy of the EyeTunica FibrosaTunica VasculosaTunica Interna
  6. 6. Optical Components Transparent, admit light, refract rays focus images on retina. – Cornea  Modified extension of choroid layer – Pupil  Round opening in center of iris that allows light in  Iris controls diameter, para & symp NS – thin diaphragm composed mostly of connective tissue and smooth muscle – Aqueous humor  Secreted by ciliary body  Flows from posterior chamber to anterior chamber &reabsorbed through canal of Schlemm (glaucoma if blocked) – Lens  Suspended by suspensory ligament which attaches to ciliary body – Vitreous humor  Transparent jelly behind lens
  7. 7. Production and Reabsorption of Aqueous Humor(Canal of Schlemm)
  8. 8. Neuronal layer of Retina
  9. 9. Ophthalmic Exam
  10. 10. The optic nerves lead to the optic chiasm where The  some of the fibers in the nerve trunks cross and some do not. Visual  The optic tracts then lead to the lateralPathway geniculate nuclei of the thalamus .  Each lateral geniculate nucleus actually receives information from both eyes.   The lateral geniculate nuclei, bring together information from both eyes.   Information is then passed on to the visual cortex in the occipital region of the cortex.
  11. 11. Shape Abnormalities of the Eyeball
  12. 12. THREE LAYERS CILIARY BODY 1. Fibrous Tunic SCLERA LENS 2. Vascular TunicANTERIOR CHOROIDCHAMBERAqueous Humor) VITREOUS BODY 3. RETINA Vitreous Humor OPTIC NERVE CORNEA PUPIL IRIS
  13. 13. SUPERIOR RECTUS MUSCLE LACRIMAL GLAND IRIS behind transparent CORNE MEDIAL RECTUS MUSCLATERAL RECTUS MUSCLE PUPIL SCLERA RIGHT EYE INFERIOR RECTUS MUSCLE NOSESUPERIOR & INFERIOR OBLIQUE MUSCLES are not shown

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