RESUMO
The surface pattern of the small intestine of the chicken was studied using SEM in stages ranging from 11th day of foetal development to 60 days of post-natal life. The definite villi of the small intestine were preceded by the development of the previllous ridges. The villi were finger like and of unequal length during incubation. After hatching, gradually, the villi were longer, well formed with furrows along their sides. Respectively, the crypts, being present at late incubation, increased with age. Columnar epithelial cells with dense microvilli lined the luminal surface of the intestine with obvious goblet cells openings among them.
Assuntos
Intestino Delgado , Microscopia Eletrônica de Varredura , Animais , Embrião de Galinha , Enterócitos/ultraestrutura , Formaldeído , Intestino Delgado/embriologia , Intestino Delgado/crescimento & desenvolvimento , Intestino Delgado/ultraestrutura , Fixação de TecidosRESUMO
The surface pattern of the caeca of the chicken was examined using the scanning electron microscope (SEM) in stages ranging from 11th day of foetal development to 60 days of post-natal life. During incubation the proximal region (basis) of the caecum presented a few irregular elevations, which were later regarded as villi and after hatching, gradually, became longer and wider. These structures were found to be similar to those of the small intestine. The middle (corpus) and distal (apex) regions of caecum presented ridges/folds with short and blunt villi that were even shorter in the apex. The ridges/folds were running longitudinally the inner surface of the corpus while those of the apex were not so well developed.
Assuntos
Ceco/embriologia , Galinhas/crescimento & desenvolvimento , Animais , Ceco/crescimento & desenvolvimento , Ceco/ultraestrutura , Embrião de Galinha , Formaldeído , Glutaral , Microscopia Eletrônica de Varredura , Fixação de TecidosRESUMO
The surface pattern of the large intestine mucosa (caecum and colon) of the rabbit was examined using scanning electron microscope (SEM), in stages ranging from 26 days of foetal to 24 days of post-natal life. It was composed of villi in the foetus and in 1-day-old rabbit. By the 16th day of life these villi were replaced by ridges.
Assuntos
Ceco/ultraestrutura , Colo/ultraestrutura , Animais , Animais Recém-Nascidos/anatomia & histologia , Ceco/embriologia , Ceco/crescimento & desenvolvimento , Colo/embriologia , Colo/crescimento & desenvolvimento , Mucosa Intestinal/ultraestrutura , Microscopia Eletrônica de Varredura , Microvilosidades/ultraestrutura , CoelhosRESUMO
The surface pattern of the stomach and the small intestine of the rabbit was examined using SEM in stages ranging from 26 day of foetal to 24 days of post-natal life. The stomach glands were evident in the late foetuses and became gradually deeper after birth. The villi of the small intestine appeared to have a gradual development during foetal and post-natal life, being short and thick with rounded tips during foetal life while becoming long, slender and finger-like with increasing age.
Assuntos
Envelhecimento/fisiologia , Desenvolvimento Embrionário e Fetal/fisiologia , Mucosa Gástrica/embriologia , Mucosa Intestinal/embriologia , Microvilosidades/ultraestrutura , Animais , Duodeno , Mucosa Gástrica/crescimento & desenvolvimento , Íleo , Mucosa Intestinal/crescimento & desenvolvimento , Jejuno , Microscopia Eletrônica de Varredura , CoelhosRESUMO
The distribution of alkaline phosphatase in normal duodenal, jejunal, ileal and large intestinal mucosa of the rabbit has been studied by histochemical method. New Zealand White rabbits were used ranging from 26-day-old foetuses to 43-day-old young and the findings of ALP-ase reaction are discussed and correlated in connection to age and change of nutrition.
