1 / 16

Chapter 14

Chapter 14. Ocular System. Eye: structure for sight Extraocular: outside the eye Intraocular: inside the eye Periocular: around the eye. Ocular Accessories (Adnexa/Stroma). Orbit: bony cavity of skull, eye held here Eye muscles: work together for Binocular 7 major muscles per eye

leila-maldonado
Download Presentation

Chapter 14

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 14

  2. Ocular System • Eye: structure for sight • Extraocular: outside the eye • Intraocular: inside the eye • Periocular: around the eye

  3. Ocular Accessories (Adnexa/Stroma) • Orbit: bony cavity of skull, eye held here • Eye muscles: work together for Binocular • 7 major muscles per eye • 2 oblique, 4 rectus, retractor bulbi • 6 Extrinsic muscles provide attachment • Eyelids, Canthus (angle where eyelids meet), Tarsal plate (upper n lower eyelids), Meibomian glands, eyelashes, conjuctiva (mucous membrane that lines under side of each eyelid), Lacrimal apparatus (produce/store/ remove tears)

  4. Eyeball / Globe • Sclera: fibrous outer layer of eye (white of the eye) • Anterior portion = cornea • Choroid: opaque middle layer of the eye (not light passage) • Pupil : Central circular opening • Lens: clear flexible curved capsule located behind the iris and pupil, Adjusts (accommodates) to see near/far • Ciliary Body: thickened extension of choroid to aid in accommodation • Iris: “Colored portion”, contains muscles that contract pupil in response to light

  5. Eye Contin: • Retina: nerve tissue layer that receives images

  6. Canine Eye

  7. Vision • Accommodation: Distance • Refraction: Lens bends rays of light to help focus • Convergence: simultaneous inward movement in both eyes, normally happens as an object moves closer • Acuity: sharpness of vision

  8. Common Tests: Eyes • PLR: pupillary light reflex: animal’s response to light • Flourescein: dye on the surface to detect corneal injury • Menace Response: eye should close as object moves towards it • Palpebral reflex: blink in response to eye being touched • Schirmer tear test: graded paper slip measures tear production

  9. Common Ailments: • Anisocoria: unequal pupil size • Blepharitis: inflammation of eyelid • Blepharoptosis: dropping of eyelid • Cataract: cloudiness of eye • Entropin: inturning of eyelid • Strabismus: “cross eyed”

  10. Common Procedures: Eyes • Common prefixes • Oplasty: surgical repair • Ectomy: removal • Otomy: incision • Centesis: removal of liquid (to relieve pressure)

  11. EARS: Structures • Outer Ear • Pinna: external portion that catches sounds waves • Middle Ear • Eardrum: tissue separating external from middle ear • Auditory ossicles: ear bones • Malleus, incus, stapes • Eustachin tubes • Oval window: separates middle from inner ear • Round window: membrane receives sound waves • Tympanic bulla: located at base of skull

  12. EAR Structures Continued: • Inner Ear • Bony Labrinth • Vestibule: balance and position • Semicircular canals: hairlike structures help with spacial awareness • Cochlear: recieves and transmits sound waves to the brain

  13. Testing Ears • Otoscopy: exam for parasites • Otoscope: Tool used for otoscopy

  14. Pathology • Otalgia: ear pain • Deafness: hearing loss • Otomycosis: fungal infection of the ear • Otopyorrhea: pus discharge from ear

  15. Activities • Diagram of Eye (pg 292) and Ear (pg 299) • Outline of Sight (pg 291-292) and Sound (pg 300) • Explain balance, and how the body reacts to changes

More Related