Ultrastructure of Mugil brasiliensis Teleost Retina I: Cones, Rods, Horizontal, Bipolar, Piriform Amacrines, Tubular Cells, Undulate Amacrine Cells, Outer and Inner Plexiform Layers
Journal Title: Journal of Advances in Medicine and Medical Research - Year 2017, Vol 19, Issue 2
Abstract
Aims: To analyze the ultrastructure of cones, rods, horizontal, bipolar and amacrines cells from Mugil brasiliensis teleost retina as well as all the connections found between the cells. Methodology: The retina was fixed with glutaraldehyde and osmium tetroxide and radial and tangential sections stained with lead citrate and uranyl acetate to be analyzed in a Hitachi 11B electron microscope at 75 Kv. Results: Horizontal cells had finger like process reaching the outer plexiform layer ending in cone and rod invaginations, and also lateral unions between plasma membranes, forming a net, with a functional contact between them. Bipolar cells were radially oriented with dendrites branching in the outer plexiform layer contacting cones and rods and lower terminals branching in the inner plexiform layer. Stellate amacrine cells send ascendant process to the outer plexiform layer and form a continuous net below horizontal cells. A new layer named tubular cells was described by the first time below internal horizontal cells forming a net. Undulate amacrine cells around bipolar cells were also described by the first time. Cones and rods terminals had ascendant expansions of horizontal and bipolar cells in a triad structure around the synaptic band. Piriform amacrine cells were described with dark cytoplasm due to numerous glycogen granules and with clear cytoplasm with scarce glycogen granules, both sending prolongations to the inner plexiform layer. Conclusion: This paper is a comprehensive analysis of ultrastructure of seven retinal cells, finding two new cells in teleost retina, 1- tubular cells forming an extensive tangential net below internal horizontal cells, with characteristic structures not seen in the literature on retina before and, 2- undulate amacrine cells that surrounds many bipolar cells across the retina. Functional contacts structured by bilaminar membranes were found between digital terminals of horizontal cells and bipolar cells in rods and cones, between bipolar dendrites, tubular cells, stellate amacrine cells, piriform amacrine cells, as well as between lateral expansions of horizontal cells.
Authors and Affiliations
Jose Antonio O'Daly
Keywords
Related Articles
- EP ID EP311227
- DOI 10.9734/BJMMR/2017/30371
- Views 69
- Downloads 0
Gestational Diabetes Mellitus: Risk Factors and Perinatal Outcomes in Abha, Saudi Arabia
Objective: This study aimed to assess the risk factors associated with gestational diabetes mellitus (GDM) and evaluate its maternal-neonatal outcomes in pregnancies among Saudi women. Materials and Methods: A one-year r...
Acute B-Cell Lymphoblastic Leukemia/Acute B-Cell Lymphoblastic Lymphoma Presenting as Bilateral Breast Masses
Aims: Metastases of leukemia and lymphoma to both breasts were very rare. We have aimed to report a rare and interesting case that presented with metastases of leukemia and lymphoma to both breasts. Case Report: A thirty...
Knowledge of Lassa Fever among Students of a College of Education: Call for Inclusion in Curriculum
Aims: To determine the level of knowledge of Lassa fever among students of a Federal College of Education. Study Design: A descriptive, cross-sectional study. Place and Duration of Study: Adeyemi College of Education, O...
Bleeding Jejunal Diverticula: Case Report and Literature Review
Jejunal diverticulosis is an asymptomatic condition that is sporadically seen during radiological studies or laparotomy. Complications such as diverticulitis, intestinal obstruction or abscess formation are documented; o...
Loss of Autonomic Nervous System Control of Blood Pressure in Patients with Parkinson’s Disease
Parkinson’s disease (PD) manifests with motor symptoms of tremor, bradykinesia, muscle rigidity and postural instability. However, various nonmotor symptoms (NMS) have recently been recognized, among which autonomic dysf...