"Exploring the Subtle Realms: Understanding the Transformative Stages of Shat...
Garbhavkranti and embryonic development
1.
2.
3. Shushrut Sharir Sthanam
Charak Sharir Sthanam
Charak Indriyasthanam
Text book of Human Embryology
4.
5. Contents-
1. Shristi uttpatikrama.
2. Definition of garbha.
3. .Masanumasik garbha vridhi
4. Panchmahabhutatmak bhav and contribution of
panchmahabhutas in the development of garbha.
5. Varnouttpatti (controlling the color and
complexion of the fetus)
6.
7. According to ‘Charaka’
1.“शुक्रशोणितंजीवसंयोगे तु खलु क
ु क्षिगते गर्भसंज्ञा यत”|
2.गर्भस्तुखल्वन्तरििवाय्वग्नितोयर्ूमिववकािश्चेतिाधिष्ठािर्ूतः
एवििया युक्त्या पञ्चिहार्ूतववकािसिुदाया्िको
गर्भश्चेतिाधिष्ठािर्ूतः स ह्यस्य षष्ठो िातुरुक्ततः| (चिक शािीि 4)
According to ‘Sushruta’
“शुक्रशोणितं गर्ाभशयस्थिा्िप्रकृ ततववकािसंिूग््छभतं गर्ं इ्यु्यते तं
चेतिावग्स्थतं वायुववभर्जतत तेज एिं पचतत आपः क्तलेदयग्न्त पृधथवी संहग्न्त
आकाशं ववविभयतत एवं वववधिभतः स यदा
हस्तपादग्जह्वघ्रािकिभतितम्बाददमर्िङ्गैरुपेतस्तदा शिीि इतत संज्ञां लर्ते त्च
षडङ्गं शाखाश्चतस्रो िध्यंपञ्चिं षष्ठं मशि इतत I३I
22. A development of a fetus from a single cell
(zygote) to the complete embryo is called
embryonic development.
Stages of embryonic development –
1. Fertilization
2. Cleavage
3. Blastulation
4. Gastrulation
5. Neurulation
6. Organogenesis
23. Fertilization is the process where two sex cells ( gametes) fuse
together to produce a new individual with genetic potentials
derived from both parents.
It have 4 major steps-
1. Sperm contact the egg.
2. Sperm or its nucleus enters
the egg, and regulation
sperm entry.
3. Sperm and egg nuclei fuse.
4. Egg become activated
and developmental changes
begin.
24. Cleavage is the process of repeated rapid mitotic cell division of the zygote
(unicellular structure) to from the blastula (multicellular structure).
Continue divisions to from a ball of 32 cells called the morula.
The morula continues division to form the hollow blastula with up to several
hundred cells.
25. * The result (end period)of cleavage.
* The production of multicellular blastula.
* Blastula cells are called blastomeres.
* A cavity forms within the ball of the cells called the blastocoels
26. The morphogenetic process called gastrulation rearranges the
cells of a blastula into a three-layered (triploblastic) embryo,
called a gastrula, that has a primitive gut.
The gastrula is a three
layered embryo.
The formation of three
primary embryonic
germ layers :
*Endoderm (inner)
* Mesoderm (middle)
* Ectoderm (outer)
27.
28. Found only in chordates. Formation of a dorsal, hollow neuraltube
Neural folds fuse and form neural tube.
Anterior end develops into brain.
Posterior end develops into spinal cord.
29. The neural crest is a critical structure that guides formation of several
organ systems.
30. Organogenesis is the formation of the organs. Organogenesis begins with
development of the nervous system. The nervous system is the first system to
develop.
Development of organs from three primary germ layers.
31.
32. The embryonic development of the 1st month is
completed and the embryo at the end of first month
looks like the picture given below :
33. Major justification for studying embryology is to
provide a basic for understanding –
The genes of birth defects.
It understand how are embryo undergoes different
changes to reach the adult stages.
To provide the area for studying the genetic
control of the development process.
34. कोष (cells ) र्ूतािुसाि पांच र्ागो िें ववर्ाग्जत हो जाते
है, जेसे – आकाशीय, वायव्य, आनिेय, जलीय औि पाधथभव
कोष
वायु की अधिकता –Endoderm (अन्तःस्ति)
वायु की अधिकता – Ectoderm(बाह्य स्ति)
पृववी,अग्नि,जल की अधिकता– Mesoderm(िध्यस्ति)