Following are the important features of fetal circulation: 1. Placenta plays the role of lungs; lungs are not functional: Like pulmonary veins, left umbilical vein…
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Embryology
Renal (Kidney) Development – Embryology Made Easy
Kidney development occurs chronologically from cranial to caudal direction from urogenital ridge (intermediate mesoderm) in 3 different phases. Intermediate mesoderm → urogenital ridge (longitudinal elevation…
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Face and Palate Development – Embryology made Easy
4 week embryo 5 mesenchymal prominences (facial primordia) appear in relation to the stomodeum (a depression in the surface ectoderm which marks the future mouth…
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Heart Development – Embryology Made Easy
Heart Tube At the beginning of 4th week of development, heart is a continuous and valveless linear tube that resembles a chicken hung upside-down. It consists…
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Embryology Week 3: Trimalinar Germ Disc
In the Week 2, we had a bilaminar germ disc with 2 cavities (amniotic cavity and yolk sac) suspended in the chorionic (extraembryonic cavity) by…
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Embryology Week 2: Rule of Twos
Starting from Day 8, blastocyst progressively invades into the endometrial stroma and there is formation of: 2 layers in Trophoblast: 1. Inner mononulcear Cytotrophoblast (Cellular)…
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Embryology Week 1: Cleavage to Implantation
Following events occur in the zygote formed in the week zero of development: Cleavage Approximately 24 hours after fertilization the zygote begins with the first…
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Embryology Week 0: Gametogenesis, Ovulation and Fertilization
Gametogenesis – formation of gametes from primitive germ cells Spermatogenesis, begins at puberty and occurs in seminiferous tubules (spermiogenesis occurs in sertoli cells). One spermatogenesis takes an…
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