Question

Notice how the pattern of mted blood to the inferior vena cava, but the blood doesn' remain fully oxyermated for oxygenatios differs in the concepus versus the neonate. The umbilical vein delivers mix with deoxygenated blood coming in from the inferior vena cava, and it mises w the superior vena cava when it enters the righe atrium. For this reason, the blood traveln circuit of the concepeus is never fully oxygenated and is represented as purple in re blood from arserial 28,6 inssead of red. Procedure 1 Model Inventory of Fetal Development ldentify the following structures of developement on models and diagrams, using your Exercises 28-1 (p. 741) and 28-2 for reference. As you examine the anatomical models and diagrams textbook and Table 28.1.When Fecord the name of the model and the structures you were able to identify on the model inventory inT you have completed the activity, answer Check Your Understanding questions 2 throuph 4 (p. 757 1. Stages of development 2. Fetal membranes 3. Vascular structures a. Zygote b. Morala c. Blastocyst a. Yolk sac b. Amnion (1) Placental sinus (2) Maternal arteries and veins (1) Amniotic cavity (2) Amniotic fluid (1) Inner cell mass (embryoblast) b. Umbilical cord (1) Umbiical vein (2) Trophoblast d. Implanted blastocyst e. Embryo f. Ferus c. Chorion (1) Chorionic villi (2) Umbilical arteries c. Ductus venosus d. Foramen ovale TABLE 28.1 Model Inventory for the Stages of Development and Fetal Structures

Answer 1

1. Stages of development:-

Cleavage 30 hours) 8 cell stage Morula (72 hours) 4 cell stage Blastocyst (4 days) 2 cell stage Implanted Blastocyst (6 days) Zygote Egg Nucleus Sperm Nucleus Fertilization Secondary Oocyte

2. Fetal members:-

Chorionic cavity Amniotic cavity Decidua basalis (basal plate) Chorion frondosum chorionic plate) Chorion laevae Decidua capsularis Decidua parietalis

3. Vascular structures:-

Aorta Ductus Arteriosus Foramen Ovale Pulmonary Artery Lung- Lung Ductus Venosus Placenta Liver Left Kidney Umbilical Cord Umbilical Vein Umbilical Arteries