What are the 3 layers of the retina?
The cellular layers of the retina are as follows: 1) The pigmented epithelium, which is adjacent to the choroid, absorbs light to reduce back reflection of light onto the retina, 2) the photoreceptor layer contains photosensitive outer segments of rods and cones, 3) the outer nuclear layer contains cell bodies of the …
What is the neurosensory retina?
THE NEUROSENSORY RETINA. The neurosensory retina, or inner layer, consists of three layers of nuclei (ganglion cell, inner and outer nuclear cell layers) and three layers of fibres (nerve fibre, inner and outer plexiform layers). The neurosensory retina is transparent and is thinnest at the fovea.
What does the outer plexiform layer contain?
The outer plexiform layer contains synapses among and between retinal photoreceptors, horizontal cells, and bipolar cells. Contacts between a single cone pedicle or rod spherule, a centrally placed postsynaptic bipolar cell process, and two laterally placed horizontal cell processes form a triad.
What are the 10 layers of retina?
Broadly there are ten layers in Retina: 1.
- Retinal pigment epithelium 2.
- Layer of Rods & Cones 3.
- External limiting membrane 4.
- Outer nuclear layer 5.
- Outer plexiform layer 6.
- Inner nuclear layer 7.
- Inner plexiform layer 8.
- Ganglion cell layer 9.
What are the 3 layers that surround the eye and their functions?
The eye is made up of three layers: the outer layer called the fibrous tunic, which consists of the sclera and the cornea; the middle layer responsible for nourishment, called the vascular tunic, which consists of the iris, the choroid, and the ciliary body; and the inner layer of photoreceptors and neurons called the …
What is the function of the iros?
The iris controls the amount of light that enters the eye by opening and closing the pupil. The iris uses muscles to change the size of the pupil. These muscles can control the amount of light entering the eye by making the pupil larger (dilated) or smaller (constricted).
What is the plexiform layer of cerebellum?
The plexiform layers are regions in which the neurons make their interconnections. Thus, the outer plexiform layer contains the rod and cone projections terminating as the rod spherule and cone pedicle; these make connections with the dendritic processes of the bipolar cells, so that changes produced…
How many layers are in retina?
ten different layers
The retina itself consists of six different cell lines divided into ten different layers, each playing a specific role in creating and transmitting vision. The different cell types perform a particular role and form functional circuits that specialize in detecting specific variations and movements of light.
Can a sdoct image identify Henle’s fiber layer?
Despite their presence on histologic studies, traditionally acquired SDOCT images are unable to delineate the axons of photoreceptor nuclei, Henle’s fiber layer (HFL). The authors present a new method to reliably identify HFL by varying the entry position of the SD-OCT beam through the pupil.
How to distinguish HFL from true ONL in photoreceptor layer thickness?
The authors demonstrated a novel method to distinguish HFL from true ONL. An accurate measurement of the ONL is critical to clinical studies measuring photoreceptor layer thickness using any SD-OCT system. Recognition of the optical properties of HFL can explain reflectivity changes imaged in this layer in association with macular pathology.
How does the reflectivity of HFL affect the ONL?
The reflectivity of HFL was directionally dependent and increased with eccentricity on the side of the fovea opposite the entry position. When HFL was included in the measurement, the thickness of the outer nuclear layer (ONL) of central horizontal B-scans increased by an average of 52% in three subjects quantified.
How are the lobules connected to the hair follicle?
The sebaceous gland lobules are connected to the hair follicle, usually about two-thirds to three-quarters of the way up from the hair bulb, by short ducts lined by stratified squamous epithelium, showing all the layers seen in the normal epidermis.