1 / 7

Introduction to

Introduction to. EMBRYOLOGY. Vertebrate Eggs. Microlecithal : very little yolk Macrolecithal : massive amount of yolk Mesolecithal : moderate amounts of yolk Isolecithal : even distribution of yolk Telolecithal : cytoplasm and yolk are on opposite poles of egg. Types of Egg Laying/Birth.

gent
Download Presentation

Introduction to

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction to EMBRYOLOGY

  2. Vertebrate Eggs • Microlecithal: very little yolk • Macrolecithal: massive amount of yolk • Mesolecithal: moderate amounts of yolk • Isolecithal: even distribution of yolk • Telolecithal: cytoplasm and yolk are on opposite poles of egg

  3. Types of Egg Laying/Birth • Oviparous: lay eggs • Viviparous: live birth (with placenta) • Ovoviviparous: live birth; no placenta (dogfish shark) • Euviviparous: nourishment must be supplied constantly by mother

  4. Invagination vs. Evagination • Invagination: movement of cells or tissues inward • Evagination: movement of cells or tissues outward

  5. Meiosis • Forms gametes • Reduces number of chromosomes by half • When two gametes join, normal number of chromosomes are restored • Gametes are HAPLOID (n) • Zygote: fertilized egg

  6. Embryology Terms to Know • Diploid: whole number of chromosomes (2n) • Morula: Solid mass of 16 cells • Clevage: split in cell • Blastula: hollow ball of cells • Blastocoel: hollow part of blastula • Gastrocoel: hollow space after invagination

  7. More Terms to Know • Primitive Streak: develop of chick • Somites: blocks of mesoderm that form structures and organs (tells the age of embryo) • Henson’s Node: knot from which the notochord grows

More Related