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8/14/2019 EARLY EMBRYONIC DEVELOPMENT.ppt
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EARLY EMBRYONIC
DEVELOPMENTCM/IKD6 (3 JAM).
Dr. Kamajaya, MSc.,SpAnd.Dept. Biologi
Fak.Kedokteran USU Medan.
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Early Embryonic Development.General Outlines.
1. Gametogenesis.1.1. Gonad development, and the Germ cells.
1.2. Mitotic and Meiotic cells division.
1.3. Spermatogenesis.
1.4. Oogenesis.2. Embryogenesis.
2.1. Fertilization process.
2.2. Cleavage.
2.3. Embryonic germ layers.2.4..Embryonic and Trophoblast
development.
2.5. Organ formation.
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1. Gametogenesis.1.1. Gonad development, and the Germ cells.
Embryological development of the reproductivesystem. Two major stages : 1. Indifferentstage, and 2. Gonad differentiation stage.
1. Indifferent stage. Is common in the both
sex (male and female).From middle of the third week the end of the
sixth week embryonic life.
The period of the primordia genital apparatusconstruction.
No morphological feature which indicates of theembryo as male or female.
Both the gonad and the systems of the canals(Wolffian and Mullerian ducts) which connect withthe urogenital sinus are similar.
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1. Gametogenesis.
1.1. Gonad development, and the Germ cells.
2. Gonad differentiation stage.
Begins at the seventh week :
= Transformation of the undifferentiatedgonad into : testis in a male as an effect ofthe Y-heterochromosome, and Ovarium in afemale because of no Y-heterochromo-some.
= Testicular differention were earliest then
the ovarium differentiation.= In this period, male and female can be de-
termined in reproductive morphologically.
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1. Gametogenesis.1.2. Mitotic and meiotic cell divisions.
1.2.1. Mitotic division.
a. Prophase, b. Metaphase,c. Anaphase, d. Telophase.
1.2.2. Meiotic division.= Meiosis-I :
Leptotene Zigotene Diplotene
Metaphase-I Anaphase-I
Telophase-I.
= Meiosis-II :Prophase-II, Metaphase-II
Anaphase-II Telophase-II.q
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Meiosis.
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mitosis
Germ-cellOogoniumSpermatogonium
SpgOog.
mitosis
meiosis-I
1stSptocyte 1stOocyte
1stOocyte preleptotene
ovulation
2ndSptocyte
Sptid
Spermatozoa
2ndOocyte Ootid
spermiogenesis
Male Female
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2. Embryogenesis.
2.2. Cleavage.
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2. Embryogenesis.2.4. Embryonic and Trophoblast
development.
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Late blastula & Neural fold formation.
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Triploblastic embryo.Organ formation.
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2. Embryogenesis.2.3. Embryonic germ layers.
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Human embryo.
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