This document outlines a course on general embryology. The course will describe the developmental stages of embryos and the embryonic origin of each organ. It will cover topics like the first, second, and third weeks of development, as well as development from the third to eighth weeks. The course will also discuss placentation. Exams will include multiple choice questions, short answers, diagrams, and problem solving. The document defines key terms like embryology, ontogeny, and developmental anatomy and explains what embryology is - the study of prenatal development from fertilization through birth.

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General
Embryology
Ali Asadullah

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COURSE OUTLINE
▪ Study of different developmental stages of embryo,
▪ Placentation in domestic animals and embryonic origin of
each body organ
LEARNING OUTCOME
• Describe developmental stages of embryo and embryonic
origin of each organ.

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COURSE CONTENTS
Sr. # TOPICS
1. Introduction to Embryology
2. 1st Week of Development
3. 2nd Week of Development
4. 3rd Week of Development
5. 3rd to 8th Week of Development
6. Placentation

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Recommended
Book!
Langman’s Medical
Embryology

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EXAM POINT OF VIEW
PATTERN
▪ MCQs
▪ Declarative questions-short Answers
▪ Diagrams
▪ Problem solving (if any)

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Developmental Anatomy
“The processes of embryology and ontogeny (morphogenesis) are
combined together under main heading called developmental
Anatomy”.
Embryology
“It is a branch of veterinary anatomy that deals with development of
an organism from fertilization to birth or hatching”.
Ontogeny
“Ontogeny includes period of growth, reproduction and senescence
(period from birth to death)

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WHAT IS EMBRYOLOGY?
▪ Greek Origin: Embryon (Unborn, embryo)
▪ It is a study of developing embryo.
▪ is the branch of biology that studies the prenatal
development of gametes (sex cells), fertilization, and
development of embryos and fetuses.
▪ Additionally, embryology includes the study
of congenital disorders that occur before birth

9. z Life cycle of an individual
Life cycle of an individual divided into two parts
1. Pre-natal life (before birth)
2. Post-natal life (after birth)
Pre-natal life
It is divided into two stages
1. Embryo stage: It is a period of development between fertilization of ova to
attachment of conceptus to the endometrium
2. Foetus: It is a period of development between attachment of conceptus to
the uterus to birth and characterized by development and growth of body system

10. z Post-natal life
Comprised of four developmental stages of individual.
Neo-natal stage: It is early period of an individual (from birth to physiological
independence)
Pre-pubertal stage: It is period up to which animal becomes sexually mature.
Puberty: It is the period of animal life, when it attains sexual maturity to produce
young ones and adult: It is prime and transition stage of animal reproduction.
Senescence: It is an old age of animal when there is cessation of reproduction and over
all decline of body system leading to death

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