Retina - contains
This presentation is the property of its rightful owner.
Sponsored Links
1 / 7

Retina - contains Pigment epithelial cells- absorb light that passes through the retina PowerPoint PPT Presentation


  • 32 Views
  • Uploaded on
  • Presentation posted in: General

Retina - contains Pigment epithelial cells- absorb light that passes through the retina First neuron Rods- vision in light of low intensity Cones- visual acuity and color vision Second neuron Bipolar- second neurons of visual pathway Ganglion Ganglion- third neurons of visual pathway. Eye

Download Presentation

Retina - contains Pigment epithelial cells- absorb light that passes through the retina

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Retina contains pigment epithelial cells absorb light that passes through the retina

Retina - contains

  • Pigment epithelial cells- absorb light that passes through the retina

  • First neuron

    • Rods- vision in light of low intensity

    • Cones- visual acuity and color vision

  • Second neuron

    • Bipolar- second neurons of visual pathway

  • Ganglion

    • Ganglion- third neurons of visual pathway

Eye

  • Lens

  • Cornea

  • Iris

  • Suspensory ligaments

  • Ciliary body

  • Ciliary muscle

  • Retina

  • Choroid

  • Sclera

  • Subarachnoid space

  • Central retinal artery and vein

  • Optic nerve

  • Vitreous body

  • Conjunctiva

Neuroanatomy OC TH 5090/PH TH 7050 - K. Bo Foreman PT, PhD


Retina contains pigment epithelial cells absorb light that passes through the retina

Visual Pathway-

  • Light travels through retina from internal to external exciting the rods and cones

  • Impulse is transferred from rods and cones to bipolar cells

  • Bipolar cells synapse on the dendrites of the ganglion cells

Additional areas:

  • Optic disc- Area optic nerve exits retina (blind spot- no receptors)

  • Macula lutea- central region of the retina

  • Fovea centralis- area of the central part of the retina that is indented and contains mainly cones for visual acuity

Neuroanatomy OC TH 5090/PH TH 7050 - K. Bo Foreman PT, PhD


Retina contains pigment epithelial cells absorb light that passes through the retina

Visual Pathway- forth order neurons

  • Cell body located in the lateral geniculate body

  • Axon travels posteriorly (optic radiations)

  • Terminates in the visual cortex in the occipital lobe

Visual Pathway-

  • Ganglion cells form the optic nerve at the level of the optic disc

  • Optic nerves combine to form optic chiasm

  • Enters lateral geniculate body to synapse


Retina contains pigment epithelial cells absorb light that passes through the retina

  • 1. Right eye blindness - trauma, optic neuritis

  • 2. Bitemporal hemianopsia - pituitary tumors

  • 3. Right nasal hemianopsia - pressure by aneurysm of internal carotid artery

  • 4. Left homonymous hemianopsia - abscess or tumor of temporal lobe

  • 5. Left homonymous hemianopsia - anterior choroidal artery dysfunction

  • 6. Left homonymous superior quadratic anopsia - temporal or occipital lobe dysfunction

  • 7. Left homonymous inferior quadratic anopsia - parietal or occipital lobe tumor

  • 8. Left homonymous hemianopsia with macular preservation - posterior cerebral artery dysfunctions, tumors, trauma

1.

2.

3.

4.

5.

6.

7.

8.

Neuroanatomy OC TH 5090/PH TH 7050 - K. Bo Foreman PT, PhD


Retina contains pigment epithelial cells absorb light that passes through the retina

Visual Reflexes

  • Light reflex (constriction- parasympathetic): when light enters the pupil the pupil constricts

    • Neuronal elements of the retina

    • Optic nerve

    • Optic chiasm

    • Optic tract

    • Enter the brachium of the superior colliculus (superior brachium)

    • Pretectal region

    • Oculomotor nuclear complex (Edinger-Westphal nucleus)

    • Preganglionic parasympathetic axons to the ciliary ganglion behind eye

    • Short ciliary nerves

    • Terminate on the constrictor muscle of the iris

Neuroanatomy OC TH 5090/PH TH 7050 - K. Bo Foreman PT, PhD


Retina contains pigment epithelial cells absorb light that passes through the retina

Visual Reflexes

  • Light reflex (dilation- sympathetic): when the pupil widens. Occurs passively when parasympathetic tone decreases and actively when sympathetic tone increases

    • Hypothalamus

    • Spinal cord (T1)

    • Ventral root

    • White communicating rami

    • Ascend sympathetic trunk

    • Synapse in superior cervical ganglion with post-synaptic sympathetic ganglion

    • Travel in the carotid plexus

    • Terminate on the dilator muscle of the iris

Neuroanatomy OC TH 5090/PH TH 7050 - K. Bo Foreman PT, PhD


Retina contains pigment epithelial cells absorb light that passes through the retina

Visual Reflexes

  • Accommodation reflex: Process in which a clear visual image is maintained as gaze is shifted from a distant to a near point

    • 3 components

      • Convergence of the eyes

      • Pupillary constriction

      • Thickening of the lens

    • Initiated by occipital cortex

    • Impulses go to:

      • Edinger-Westphal nucleus for changes in the lens and pupil (parasympathetic)

      • Somatic nuclei: for convergence of the eyes (medial rectus

Neuroanatomy OC TH 5090/PH TH 7050 - K. Bo Foreman PT, PhD


  • Login