Banca de DEFESA: ELLEN YASMIN EGUCHI MESQUITA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ELLEN YASMIN EGUCHI MESQUITA
DATA : 13/06/2019
HORA: 14:00
LOCAL: Auditório da Zootecnia Profissionalizante.
TÍTULO:

ESOPHAGUS MORPHOLOGY, STOMACH AND GASTRIC FOOD PROGRESSION OF THREE FINGER SLOTS (Bradypus variegatus)

PALAVRAS-CHAVES:

Esophagus, Stomach, Anatomy, Histology, Xenarthra.

PÁGINAS: 49
GRANDE ÁREA: Ciências Agrárias
ÁREA: Medicina Veterinária
SUBÁREA: Clínica e Cirurgia Animal
ESPECIALIDADE: Clínica Veterinária
RESUMO:

The adaptations to the arboreal folivore diet of sloths are evident soon in chewing. Due to food specialties, sloths have a range of morphophysiological traits in the digestive tract, in line with the acrobatic behavior performed by these Xenarthros, which represent a differentiated group with respect to anatomy and digestive physiology. In view of the above, the objective was to investigate the morphological characteristics of the common sloth digestive apparatus, in order to support the understanding of the digestion of these animals, as well as their feeding behavior. In the seven adult animals studied, the esophagus started the larynx dorsal to the left of the trachea, remaining adjacent to it, still in the left antimer, along the entire cervical portion. In the thorax, it crossed the mediastinum, crossing the diaphragm through the esophageal hiatus, reaching the stomach. Histologically, the esophagus followed a peculiar pattern that facilitated the understanding of the animal's digestive tract, being this with keratinized mucosa and skeletal striated muscular layer, presenting smooth muscle only in the transitional esophagus-stomach region. The stomach of these animals allowed to characterize the division into seven compartments: cranial sac, central sac, fundus, caudal sac, diverticulum and pre-piloro I and II. The cranial sac was characterized by the esophageal insertion zone, the first cavity of the stomach being located in the cranial region, deviated from the left. Next, the central sac positioned in the medial region of the animal's body was preceded by the caudal sac, which was positioned in the right antimer. The fundus was located in the central cranial region of the organ, above the diverticulum, which overlapped the prepubertals I and II (duodenal insertion). Microscopically, the compartments revealed two distinct patterns: a flattened keratinized flattened aglandular tissue fraction and a glandular fraction of mucosa coated with low prismatic glandular epithelial tissue with short pits and long glands. In the imaging exam, we verified ultrasonographically the presence of stomach valves and contrast x-ray contrast with the traffic transit through the gastric cavities. Finally, we conclude that the unique configuration of the esophageal tube together with the morphological complexity of the stomachs and posture behaviors before and after ingestion, together with the histological composition, infer some of the peculiar behaviors of the sloths of the Bradypus variegatus species, knowledge of food traffic. These findings could guide new research on the morphological behavior of intestines of this species, as well as investigations on the digestibility of food.

MEMBROS DA BANCA:
Presidente - 1661748 - ERIKA RENATA BRANCO
Interno - 1733442 - ANA RITA DE LIMA
Externo ao Programa - 1550251 - FERNANDA MARTINS HATANO
Externo à Instituição - MARIA AUXILIADORA FERREIRA - UFPA
Externo à Instituição - JOSÉ LEDAMIR SINDEAUX NETO - UFRA