STANLEY T. AGOR, BS Biology, MD GRADUATE SCHOOL CAGAYAN STATE UNIVESITY Tuguegarao City, Cagayan The central nervous system (CNS) appears at the beginning of the third week…

1. Growth and development Definition  Growth refers to changes in magnitude.  Development refers to account for how it happens.  Growth centre refers to the location…

Slide 1 1 The thesis of “16 Days” Slide 2 2 first there are two: t1t1 Slide 3 3 t2t2 Slide 4 4 but somewhere along the way there is one t3t3 Slide 5 5 t4t4 Slide 6 6…

Slide 1 Slide 2 Human Development Slide 3 27.9Relate the structure of sperm to its role in fertilization. Describe the mechanisms that prevent more than one sperm from fertilizing…

Slide 1 Slide 2  Prenatal: ◦ Pre-Implantation ◦ Embryonic ◦ Fetal Slide 3  An oocyte is normally fertilized by a single sperm 12-24 hours after it’s released.…

Slide 1 Slide 2 The extraembryonic mesoderm lining the inside of the cytotrophoblast is then known as THE CHORIONIC PLATE The only place where extraembryonic mesoderm traverses…

Slide 1 22-1 Chapter 22: Development and Aging Slide 2 22-2 Early Developmental Stages Fertilization occurs when the sperm and egg interact to produce a zygote. During fertilization,…

Slide 1 Cleavage to gastrulation M.A.Kai-Kai Slide 2 Learning Objectives.   Define major mechanisms of development.   Describe the mammalian zygote.   Understand…

38.9 Overview of Animal Development All sexually reproducing animals begin life as a zygote, the diploid cell that forms at fertilization The same development steps and processes…

The thesis of “16 Days” first there are two: t1 t2 but somewhere along the way there is one t3 but somewhere along the way there is one t4 but somewhere along the way…