howMed Know Yourself
The period from the beginning of the ninth week to birth is known as fetal period. During this period, differentiation … Read More »
Human Fetal Period
Birth Defects
Any structural, behavioral or metabolic disorders present at birth are known as birth defects. Other related terms include: a. Teratology/Dysmorphology … Read More »
Derivatives of Endoderm (Embryonic Period)
The endoderm germ layer covers the ventral surface of the embryo forming the roof of the yolk sac. The GIT … Read More »
Derivatives of Mesoderm (Embryonic Period)
•Initially cells of mesodermal germ layer forms a thin sheet of loosely woven tissue on each side of midline. Paraxial … Read More »
Derivatives of Ectodermal Germ Layer (Embryonic Period)
Human Embryonic Period (3rd to 8th Week) This is the organogenetic period in which all major external and internal structures … Read More »
First and second week of development
First week of development CLEAVAGE Cleavage is the series of mitotic cell divisions of the zygote, resulting in the formation … Read More »
Spermatogenesis
The reproductive system of the male has two major functions: Production of sperm Delivery of these to the reproductive tract … Read More »
Oogenesis and Ovarian Cycle
PRIMORDIAL GERM CELLS Gametes are derived from PGCs. Formed in the epiblast during 2nd week and move to the wall … Read More »
Chromosomal Abnormalities
Causes of birth defects and spontaneous abortions are two fold: 1. Chromosomal abnormalities 2. Genetic factors Incidence For Major Chromosomal … Read More »
Mitosis and Meiosis
CHROMOSOMES Are structures composed of condensed DNA and associated proteins When DNA condenses, the molecule becomes wrapped around proteins called … Read More »