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On hand of the electonmicroscope, the authors study 24 parts of the encephalic ventricles in samples of Bradypus tridactylus, relating the nervous structures to the ependymal lining, chiefly emphasizing the presence of intraventricular unmyelinated fibres. In various of these regions, typical nerve fibres and other intraventricular cell projections, that… (More)
We have examined the sizes of nerve cells present in the myenteric plexus in the human esophagus, stomach, duodenum and sigmoid colon using a nonhistochemical method (Giemsa) in laminar preparations of the muscularis externa. The collagen and elastic system related fibers in the myenteric ganglia were also qualitatively evaluated. The major mean of… (More)
Hair casts or pseudonits are thin, elongated, cylindrical concretions that encircle the hair shaft and can be easily dislodged. A case of pseudonits in a 9-year-old girl is reported. Though not unusual, false diagnoses are common.
A freeze-fracture analysis of the satellite cells of spinal ganglia of the chick embryo was performed in 8 successive stages of development, from the 5th incubation day to hatching. The characteristic laminar disposition of the cells were first observed on the 7th day. Tight junctions were found at the 20th incubation day. Small groups or irregular… (More)
The densities of ganglia and nerve cells in the myenteric plexus of the last distal 11 cm of the human esophagus were determined in 6 esophagi from autopsy material. The densities of ganglia and nerve cells in cresyl violet-stained stretch preparations of 11 esophageal segments, each 1 cm in length, were compared. The highest values were recorded in… (More)
A cytomorphometric study was performed in lumbar spinal ganglia neurons of Gallus domesticus on the 10th and 18th incubation days and 8th, 35th, 61st, and 120th post-hatching days. The absolute volume of nucleus and relative volume of cytoplasm were respectively estimated by the Bach caryometric method and by point-counting volumetry, carried out in 0.5… (More)
Clear and dark satellite cell classes were identified by electron microscopy in the lumbar sensory ganglia of domestic fowl in 8 pre and 4 post-hatching stages of development. Some cytologic differences found between the two classes relating to the rough-endoplasmic reticulum, ribosomes, Golgi apparatus and junctional complexes suggest the existence of… (More)