TOTW #22 - Embryology Start QuizPage 1 of 29 Organogenesis begins during which period of development? Fetal period Embryonic period Germinal period Primordial period Page 2 of 29 Which of the following molecules is involved in limb positioning as well as craniocaudal organisation of the embryo? Zinc finger proteins Sonic hedgehog proteins Homeobox proteins Pax proteins Page 3 of 29 Which of the following shows the correct development of the lungs stage by stage? Embryonic > Pseudoglandular > Canalicular > Saccular > Alveolar Embryonic > Canalicular > Pseudoglandular > Saccular > Alveolar Pseudoglandular > Embryonic > Saccular > Canalicular > Alveolar Embryonic > Pseudoglandular > Saccular > Canalicular > Alveolar Page 4 of 29 Which of the following subtypes of tracheoesophageal fistulae occurs most commonly? Type E Type B Type A Type C Page 5 of 29 In a patient with esophageal atresia, which of the flooring defects wouldn’t you expect to occur in association? Anal atresia Tracheoesophageal fistula Hepatic anomaly Limb malformation Page 6 of 29 The infant has a history of exposure to thalidomide in-utero. What is your diagnosis? Club foot Spina bifida Phocomelia Cystic hygroma Page 7 of 29 During which week of embryonic development does neurulation occur? Week 2 Week 3 Week 4 Week 5 Page 8 of 29 Which structure gives rise to the central nervous system during embryonic development? Ectoderm Mesoderm Endoderm Neural crest cells Page 9 of 29 Which is the correct sequence of heart chamber formation during embryonic development? Atria - Ventricles - Aortic arches Ventricles - Atria - Aortic arches Atria - Aortic arches - Ventricles Ventricles - Aortic arches - Atria Page 10 of 29 During which week of gestation does the primitive streak first appear in human embryonic development? Week 1 Week 2 Week 3 Week 4 Page 11 of 29 Which of the following structures is derived from the ectoderm during embryonic development? Liver Pancreas Lungs Epidermis of the skin Page 12 of 29 A newborn is found to have a cleft lip and palate. What embryological process is primarily responsible for the development of these defects? Failure of formation of the neural tube Failure of fusion of the facial processes during embryological development, paticularly the fusion of the maxillary and medial nasal processes Failure of migration of neural crest cells Agenesis of the yolk sac Page 13 of 29 The major development of organ systems takes place in: Weeks 1 and 2 of development Weeks 3-8 of development Weeks 8-20 of development The last 30 weeks of development Page 14 of 29 The pericardial cavity forms from: Evagination of the early digestive tract The neural tube The coelom The branchial arches Page 15 of 29 Concerning the development of the face: The face develops by fusion of 5 embryonic structures The maxillary processes normally meet at the midline to form the lip The primary palate forms the roof of the mouth Clefts of the secondary palate normally occur on one side of the midline Page 16 of 29 Given the structures 1) Mesonephros 2) Metanephros 3)Pronephros. Choose the arrangement that lists the structures in the order in which they form during development 1, 2, 3 1, 3, 2 2, 3, 1 3, 1, 2 Page 17 of 29 Given the structures 1) Blastocyst 2) Morula 3) Zygote. Choose the arrangement that lists the structures in the order in which they form during development: 1, 2, 3 2, 3, 1 1, 3, 2 3, 2, 1 Page 18 of 29 What is the diagnosis? Phocomelia Cauda equina syndrome Spina bifida Branchial cyst Page 19 of 29 Oogenesis, the process that creates female gametes, is halted at prophase I until puberty. Which of the following describes the DNA content of a female’s gametes during her childhood? 46 chromosomes, 46 chromatids 46 chromosomes, 92 chromatids 23 chromosomes, 46 chromatids 23 chromosomes, 23 chromatids Page 20 of 29 Oogenesis and spermatogenesis describe the process of meiosis in females and males respectively. What statement about the two processes is true? Oogenesis forms two polar bodies, spermatogenesis forms one Oogenesis produces the larger gamete Both produce the same number of viable gametes Both are halted until puberty Page 21 of 29 Which structures form the bilaminar germ disk? Mesoderm and mesenchyme Epiblast and hypoblast Endoderm and ectoderm Allantois and yolk sac Page 22 of 29 Primitive streak originates: Lateral parts of hypoblast Lateral parts of epiblast Medial line of hypoblast Medial line of epiblast Page 23 of 29 The embryonic cardinal veins that drain into the sinus venosus are: Anterior cardinal veins Superior cardinal veins Common cardinal veins All of them Page 24 of 29 A neonate born at term to a 19-year-old woman is noted not to be gaining weight as expected. At a one month checkup, the nurse practitioner palpates fullness to the baby's abdomen. An abdominal CT scan shows a left retroperitoneal mass that is 6 cm in size and solid. The mass displaces the left kidney downward. What is the diagnosis? Wilm's tutor Medulloblastoma Neuroblastoma Teratoma Page 25 of 29 Which of the following fetal structures is the precursor of ligament teres? Left umbilical vein Right umbilical vein Ductus venosus Left umbilical artery Page 26 of 29 The following originate from the fourth pharyngeal arch except: Cricothyroid Right subclavian artery Stylopharyngeus Arch of the aorta Page 27 of 29 The part of the sperm containing proteolytic enzymes to digest the zonal pellucida is: Acrosome Head Capacitor Corona Page 28 of 29 The heart starts to beat at day: 20 22 24 26 Page 29 of 29 What structure does the truncus arteriosus become? Right ventricle Left ventricle Left atrium Aorta Multiple Authors | WebsiteTOTW #26 - MicrobiologyTOTW #25 - PsychiatryTOTW #24 - BiochemistryTOTW #23 - Haematology Previous Post TOTW #21 - Paediatrics Next Post A 46-year-old with right upper quadrant pain
