HDTD-E-1 Introduction to Embryology.pdf, Lecture notes of Embryology

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Introduction to embrylogy

Lecturer Dr. Firdous M. Jaafar HHDTD Module

Objectives

1- Define Embryology

2- Evaluate the importance of studying embryology.

3- Define some terms of embryology.

Embryology

From a single cell to a baby in 9 months,

a developmental process that represents an amazing integration o f increasingly complex phenomena. The study o f these phenomena is called embryology

Why we study embryology?

• 1- provide knowledge essential f o r creating health care strategies for better reproductive outcomes.
• 2- help in prenatal diagnoses and treatments.
• 3- provide mechanisms to prevent birth defects, the leading cause o f infant mortality.

Oocyte

Sperm

Terminology of embryology

• Morula : is a 16 cell stage of division of embryo.
• Blastocyst: Is a structure formed when a cavity( blastocele) is formed within the inner cell mass of morula.

Morula, and Blastocyst

Terminology of embryology

• Germ layers of the embryo:
• 1- Ectoderm.
• 2- Mesoderm
• 3- Endoderm.