LBOBI19 - 48 hour Chick Embryo (LSVIE Descriptions) EXIT EXAM QUESTIONS AND CORRECT VERIFIED ANSWERS GRADED A+

LBOBI19 - 48 hour Chick Embryo (LSVIE Descriptions) EXIT EXAM QUESTIONS AND CORRECT VERIFIED ANSWERS GRADED A+ Region appearing posterior to the level when the brain separates into two - ANSWER Foregut Triangular region where sections cut next are through the pharynx and first pharyngeal pouches - ANSWER -Pharynx Regions formed by the first pharyngeal pouch projecting laterally from the pharynx - ANSWER -First pharyngeal grooves Morphogenetic movement forming the first pharyngeal pouches - ANSWER Invagination Double-layered membranes formed by the endoderm of the pouches and the ectoderm of the grooves - ANSWER -First closing plates Small vesicle appearing between the infundibulum and foregut, a rudiment of the anterior pituitary gland - ANSWER -Rathke's pouch Transverse slitlike space where Rathke's pouch opens in more posterior sections - ANSWER Stomodeum Two rounded masses lying between the stomodeum and Rathke's pouch - ANSWER Mandibular process of the first pharyngeal arches 2 | Page Two rounded or slightly flattened masses adjacent to Rathke's pouch - ANSWER - Maxillary process of the first pharyngeal arches Thin membrane separating the foregut and stomodeum, rupturing to form the mouth opening - ANSWER -Oral membrane Level where the pharynx rounds and expands laterally - ANSWER -Second pharyngeal pouches Depression at the floor of the pharynx at the level of second pharyngeal pouches - ANSWER Thyroid rudiment Region cut through in sections posterior to the third pharyngeal pouches - ANSWER Foregut/Pharynx Evaginations of ventrolateral portions of the foregut/pharynx - ANSWER -Lung bud Paired portions of coelom lateral to developing lung buds, continuous with pericardial cavity - ANSWER -Pleural cavities Small mass of cells lying ventral to the foregut, continuous with the foregut caudally - ANSWER -Cranial liver rudiment 3 | Page Embryonic structure where cranial liver rudiment becomes continuous with foregut when continuing caudally - ANSWER Duodenum Branches of the ventral part of cranial liver rudiment - ANSWER -Caudal liver rudiment Paired portions of coelom lateral to the duodenum form this cavity - ANSWER Rudiments of peritoneal cavity Cavity formed when rudiments of peritoneal cavity continue caudally and fuse - ANSWER Peritoneal cavity Region appearing when sections are traced posteriorly from the level of duodenum - ANSWER -Cranial intestinal portal region Endoderm lined cavity posterior to the tail bud, enlarging and covered by splanchnic mesoderm to form the allantois - ANSWER -Allantois rudiment Extraembryonic membrane formed by the enlarging and covering by splanchnic mesoderm of allantois rudiment - ANSWER Allantois Found in the level where the floor of the allantois rudiment disappears - ANSWER Caudal intestinal portal region Cavity where the allantois rudiment opens into - ANSWER -Subgerminal cavity