ISSN:
0003-276X
Keywords:
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Medicine
Notes:
The ultimobranchial bodies of the chick consisted of follicles and cell cords. The follicles were of various sizes and shapes. Their epithelium was simple or stratified, squamous to cuboidal, and contained two cell types. The lumen-bordering cells had microvilli at their apex, a few long, flat ergastoplasmic sacs, a prominent Golgi, an extensive system of smooth membrane tubules and microvesicles, abundant free ribosomes, no granules and indented nuclei. Their lateral membranes followed a sinuous path and their membrane at the base showed occasional intense pinocytotic activity. Thus these cells appear well differentiated and functionally active, whatever their function may be. The second cell type, never in contact with the lumen, also differed by its abundant granules, the smooth path of its plasma membrane, the smooth outline of its nucleus and the occasional presence of intranuclear vesicles. The cell cords were made essentially of these same granular cells. It was shown histoimmunologically that numerous calcitonin-containing cells were present in the cell cords; those few present within the wall of the vesicles never bordered on the lumen. It is concluded that the granular cells are producing calcitonin, while the lumen-bordering cells contribute the holocrine secretion of the vesicle.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/ar.1091770309
