منابع مشابه
The lobster optic lamina. IV. Glial cells.
There are 3 distinct types of glial cells in the optic lamina of the lobster: dark, light, and sheet cells, all distinguished from the neurons by being multipolar and not having dictyosomes. Dark cells are surrounded by intercellular material and together with light cells constitute a structural support for the groups of nerve cells. Light cells are also sheath cells for the neuron somata. The ...
متن کاملThe Lobster Optic Lamina Ii. Types of Synapse
The following interpretations are based on the assumption that the vesicles are presynaptic. Synapses between retinula cells are symmetrical contacts, with cisternae attached to both thickened membranes and the cleft is 8-10 m/t wide. Synapses from retinula terminal bags to the numerous invaginating spines of the ganglion cell axon have presynaptic ribbons and filaments but few vesicles; the cl...
متن کاملProcessing the Images from the Lobster Eye X–Ray Optic
The Lobster Eye optic is a kind of an X–Ray optic with a moderate angular resolution and a very large Field of View. Images obtained from the optic are well distinguishable due to the characteristic cross structure around the sources, which is the artefact of the optic. We present here the work on the modifications of two standard image processing methods to remove the cross and generaly to enh...
متن کاملOptic nerve transection in cats. II. Effect on vessels of optic nerve head and lamina cribrosa.
I n a prior communication we demonstrated that transection of the optic nerve of the cat with consequent retrograde neuronal degeneration did not lead to alteration of the ipsilateral retinal vasculature. We interpreted this to mean that retinal neuronal degeneration does not, of itself, cause an associated vascular degeneration. In the present study the vasculature of the optic disc region of ...
متن کاملDeformation of the Lamina Cribrosa and Optic Nerve Due to Changes in Cerebrospinal Fluid Pressure.
Purpose Cerebrospinal fluid pressure (CSFp) changes are involved or implicated in various ocular conditions including glaucoma, idiopathic intracranial hypertension, and visual impairment and intracranial pressure syndrome. However, little is known about the effects of CSFp on lamina cribrosa and retrolaminar neural tissue (RLNT) biomechanics, potentially important in these conditions. Our goal...
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ژورنال
عنوان ژورنال: Journal of Cell Science
سال: 1966
ISSN: 1477-9137,0021-9533
DOI: 10.1242/jcs.1.2.257