Vision

• LATERAL RECTUS: CN VI

  MEDIAL RECTUS: CN III

  SUPERIOR RECTUS: CN III

  INFERIOR RECTUS: CN III

  INFERIOR OBLIQUE: CN III

  SUPERIOR OBLIQUE: CN IV
• Fibrous tunic – outside layer

  Vascular tunic- middle layer

  Nervous coat - inner layer
• Sclera - White connective tissue layer
• Cornea

  • Transparent, central anterior portion / anterior 1/6, completely avascular
• Sclera -corneal junction
• Choroid is blood-rich nutritive tunic in 2/3 of eye
• Pigment (melanocytes) prevents light from scattering
• Iris - Pigmented part ; eye color
• Pupil – round opening in the center
• 2 smooth muscles:

  Sphincter pupillae – circumferential

  Dilator pupillae - radial
• Ciliary process: formation of Aqueous humor
• Ciliary muscles: Smooth muscle for visual accommodation
• Ciliary conule fibers: suspensory ligament that holds the lens
• 1. Aqueous humor is watery fluid - between the lens and cornea
• 2. Vitreous humor - Colorless , gel-like substance behind the lens
• Lens is transparent biconvex body
• LENS - transparent biconvex body situated immediately behind the pupil.
• Sensory Tunic (Retina) - contains receptor cells (photoreceptors)
• Rods - Long narrow cells
• Cones – plumper cells with shorter conical outer segments
• REFRACTIVE MEDIA OF THE EYE - the transparent structures traversed by the light rays on the way to the photoreceptors of the retina.
• auditory ba: 41 , 42
• eyebrow- protet tge etes vy preventing perspiration from running down the forehead and into eyes
• eyelids- protect eye from foreign object
• conjunctiva- thin, transparent mucous membrane
• lacrimal apparatus- consist of lacrimal gland
• Lacrimal gland- produces tears
• extrinsic eye muscle- responsible for movement of eyeball
• eyeball- hollow, fluid-filled sphere
• fibrous tunic- sclera and cornea, protects the eye
• SCLERA- white outer connective tissue layer of posterior five-sixths of fibrous tunic
• cornea- transparent anterior sixth of the eye, permit light to enter
• choroid- very thin structure consist of a vascular network causing it to appera black
• black color absorbs light
• cillary body- continous with choroid
• iris- colored part of the eye
• pupil- muscle surrounding the opening
• retina- covers the posterior five-sixths of the eye
• pigmented retina- keep light from reflecting black into eye
• sensory retina- contains photoreceptor cell