Structure Of Meshwork Research Articles

The Fine Structure of the Inner Wall of Schlemm's Canal

Many aspects of the anatomy and histology of the normal trabecular meshwork are comparatively well known from light microscopy. Unsolved problems exist, however, such as the exact structure of the outermost layer of the meshwork and the existence of extracellular material in the intertrabecular spaces. This preliminary report considers these two problems, and indicates the potentialities of electron microscopy for assessing the detailed structure and topography of the trabecular meshwork. Material and Methods The material used in this investigation consists of three human and four monkey eyes. The human eyes were enucleated because of malignant melanoma of the posterior pole. In no cases were there any clinical signs of impaired outflow. All human material was fixed within 1-2 minutes after enucleation, and the monkey eyes were fixed in vivo before enucleation. The fixation procedure was the same, which is routinely used for electron microscopy. Sectioning was performed on a Porter-Blum

La trame protidique des nacres

When decalcified nacre is treated with ultrasonic waves, the organic matrix resolves itself into very thin lacelike protidic leaflets, which can be studied with the electron microscope. Controls have been made showing that the lacelike structure is not an artifact due to decalcification, fixation, treatment with ultrasonic waves, dessiccation or electronic bombardment. The ultramicroscopic structure of the lacelike mesh-work differs with the species. At this level, morphological features appear to characterize the three classes of Molluscs studied (Lamellibranchia, Gastropoda, Cephalopoda), and perhaps different genera within the same class. The extraction, by a borate buffer, of a water-soluble constituent of the protidic material does not appreciably modify the appearance of the structures studied. The extraction, by a sodium hydroxyde solution, of a second component, leaves a fibrous residue rich in alanine and glycine.