Notes in 2. Emb. RS (2)

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Published	02/10/2024	Processes that occur in Week 3 of embryology:
Published	02/10/2024	In week 3, one of the first structures formed is the {{c1::primitive streak}}.It is formed in the midline of the epiblast by the dipping in of cells (…
Published	02/10/2024	Describe the formation of the Trilaminar disc (gastrulation) and specialisation of cells.
Published	02/10/2024	Describe the process of Neurulation.
Published	02/10/2024	{{c1::Gastrulation}} is the process of formation of germ layers.
Published	02/10/2024	{{c1::Neurulation}} is the process of formation of neural tube.
Published	02/10/2024	The {{c1::neural tube}} induces the mesoderm to thicken
Published	02/10/2024	The mesoderm separates into three parts:• {{c1::Paraxial}} mesoderm • {{c1::Intermediate plate}} mesoderm • {{c1::Lateral plate}} mesoderm
Published	02/10/2024	Somite formation begins from the segmentation of {{c1::paraxial}} mesoderm
Published	02/10/2024	Each somite (paraxial mesoderm) divides into 3 layers:1. {{c1::Dermatome}} → dermis of skin 2. {{c1::Myotome}} → muscles 3. {{c1::Sclerotome}} → bones…
Published	02/10/2024	{{c1::Notochord}} induces ectodermal cells in the midline to form a neural tube
Published	02/10/2024	{{c1::4th – 8th}} weeks – are called Embryonic period or Organogenetic period due to the development of organs.
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Published	02/10/2024	The ectoderm forms the {{c1::epidermis of the skin}} and the {{c1::neural tube}}.
Published	02/10/2024	The endoderm forms the {{c1::gut}} and {{c1::respiratory}} parts.
Published	02/10/2024	The Paraxial mesodorm (somites) form three parts:[1] {{c1::Dermatome}} → dermis of the skin[2] {{c1::Mytome}} → muscles[3] {{c1::Sclerotome}} → bones
Published	02/10/2024	The Intermediate plate mesoderm forms the {{c1::urogenital system (kidneys, reproductive)}}.
Published	02/10/2024	The Lateral plate mesoderm forms the {{c1::peritoneum}}, {{c1::pleura}} and {{c1::body cavities}}.
Published	02/10/2024	{{c1::Teratology}} is the study of when things go wrong during development{{c1::Teratogens}} are the environmental factors that cause abnormal develop…
Published	02/10/2024	Some teratogens:{{c1::alcohol & smoking}} - {{c1::drugs}} - {{c1::pathogens}} - {{c1::radiation}}
Published	02/10/2024	Weeks {{c1::1-2}} of pre-embryonic phase feature high risk of death (abortion), so less risk of a fetus born with teratogens.Weeks {{c1::3-8}} of embr…
Published	02/10/2024	The risk posed by a teratogen depends on 3 factors: • {{c1::Exposure during critical periods of development}} • {{c1::Dosage of drug/chemical/factor}}…
Published	02/10/2024	Prenatal diagnosis of malformations:- {{c1::Maternal Blood}} - Alpha Feto Protein - {{c1::Ultrasound scan}} – 12 week anomaly scan - Invasive tests: c…
Published	02/10/2024	Postnatal diagnosis of malformations:- Hip stability- Testes (descent)- Fingers and toes- Hearing
Published	02/10/2024	Describe the processes that occur from Wk1 to Wk4 of embryology
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