Web25 jun. 2016 · In Hydra vulgaris, physiological and pharmacological evidence exists for a hypostomal circumferential neuro-effector pathway that initiates ectodermal pacemaker activity at tentacular-hypostomal loci coordinating body and tentacle contractions.Here, we describe an ectodermal nerve ring that runs below and between the tentacles, and an … WebAbstract Hydra tissues continuously move from the growing column to the body extremities. ... Tissue dynamics of steady state growth in hydra littoralis. III. Behavior of specific cell types during tissue movements. ... The progressions of labeled cells away from the original graft site were determined by the method of radioautography.
Tissue dynamics of steady state growth in Hydra littoralis
WebThe growth pattern in Hydra littoralis was studied histologically, by methods of mitotic counting and radioautographic analysis of tritiated thymidine incorporation into cell nuclei. Some of the hydra were maintained individually for a month before experimentation and appeared to be in a mature, steady state growth condition. WebIn the column of hydra, tissues continually move away from a region located just underthe whorl of tentacles. Above this subtentacular region, tissues proceed into the hypostome and tentacles; below it tissues pass into the buds or continue down the stalk. These movements represent a steady state pattern of tissue renewal in which column growth is balanced by … formation psc1 pompiers toulouse
The fine structure of the hypostome and mouth of hydra
WebTo study the cellular basis of these movements, mosaic hydra were produced by grafting portions of isotopically labeled animals to portions of unlabeled ones. The progressions … WebHydra tissues continuously move from the growing column to the body extremities. To study the cellular basis of these movements, mosaic hydra were produced by grafting portions of isotopically labeled animals to portions of unlabeled ones. The progressions of labeled cells away from the original graft site were determined by the method of radioautography. WebIn the column of hydra, tissues continually move away from a region located just under the whorl of tentacles, and the existence of a subtentacular zone in which tissue appears … different cycles rockhampton