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SPECIAL SENSES: VISION

SPECIAL SENSES: VISION. MARTINI, FUNDAMENTALS OF ANATOMY & PHYSIOLOGY, 8 TH EDITION, CHAPTER # 17 Exercise # 21. NOTE:. THIS IS A STUDY GUIDE , NOT AN ALL INCLUSIVE REVIEW. THERE MIGHT BE THINGS NOT COVERED BY THIS STUDY GUIDE THAT MIGHT BE ASKED IN YOUR PRACTICUMS /

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SPECIAL SENSES: VISION

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  1. SPECIAL SENSES: VISION MARTINI, FUNDAMENTALS OF ANATOMY & PHYSIOLOGY, 8TH EDITION, CHAPTER # 17 Exercise # 21

  2. NOTE: • THIS IS A STUDY GUIDE, NOT AN ALL INCLUSIVE REVIEW. • THERE MIGHT BE THINGS NOT COVERED BY THIS STUDY GUIDE THAT MIGHT BEASKED IN YOUR PRACTICUMS / QUIZZES. • STUDENTS ARE RESPONSIBLE FOR READING THEIR TEXBOOK (S) AND FOR ALL THE MATERIAL COVERED DURING THE LABORATORY PERIOD, AS PER THE COURSE SYLLABUS

  3. OBJECTIVES • Identifying the structures of the eye and describe their functions.

  4. VISION Accessory structures of the eye Eyeball Aqueous humor Scleral venous sinus Vitreous humor or body

  5. ACCESSORY STRUCTURES OF THE EYES: MUSCLES

  6. ALFONSO A. PINO. MD.

  7. ALFONSO A. PINO. MD.

  8. ACCESSORY STRUCTURES: GLANDS • Lacrimal gland- tear production • Lacrimal sac- collect tears & send them to the nasolacrimal duct • Nasolacrimal duct- to drain excess of tears to the nasal cavity

  9. ALFONSO A. PINO. MD.

  10. EYEBALL: COATS • Cornea (clear outer part)- it allows the light to come in • Sclera(white part)- it protects & gives the shape to the eyes • Choroids - to nourish &to absorb excess of light • Ciliary body- to contain the ciliary muscle and ciliary process • Suspensory ligament- it holds the lens in place • Iris (part with color)- to control the size of pupil • Pupil (hole)- it lets the light to go inside

  11. Retina- it contains photoreceptors • Ganglion cells (their axons form the optic • nerve)-they carry visual info • Bipolar cells-to connect the ganglion cells • to the photoreceptors • Photoreceptors- to capture the light • Rods- night, white & black vision • Cones- bright & color vision • Optic disc(blind spot)- area without • photoreceptors where the optic nerve goes out • Macula lutea- it contains high • concentration of cones (yellow spot) • Fovea centralis(inside the macula lutea)- • To give sharpest vision

  12. ALFONSO A. PINO. MD.

  13. ALFONSO A. PINO. MD.

  14. ALFONSO A. PINO. MD.

  15. ALFONSO A. PINO. MD.

  16. ALFONSO A. PINO. MD.

  17. Lens- to focus the light • Cavities • Anterior cavity- it contains the aqueous humor • Anterior chamber (space between the cornea • & Iris)- it contains aqueous humor • Posterior chamber (between iris & lens)- it also contains • aqueous humor • Posterior cavity(area behind the lens)- • it contains vitreous humor

  18. ALFONSO A. PINO. MD.

  19. AQUEOUS HUMOR, SCLERAL VENOUS SINUS & VITREOUS HUMOR • Aqueous humor- to nourish the lens & the cornea • Because they do not have blood vessels • Sclera venous sinus(canal of schelmm)- to drain • the aqueous humor. • Important- if obstruction = glaucoma = blindness • Vitreous humor- it maintains the shape of the • lens & prevents collapse

  20. REMEMBER!GO TO THE TUTORING ROMMAND PRACTICE WITH MODELS.ROMM 3326.

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