Histology is the microscopic study of Anatomy
Domain of the microscopic anatomy is the study of minute structure of body with the help of different types of microscopes, which are instruments that provide enlarged images of small objects.
The microscopic anatomy is further divided in to
Cytology ……… the study of cells,
Histology ………the study of tissues,
Organology ……the study of organs
Systems ……… the study of various organs performing same function
However, the term histology is customarily used as an alternative title for microscopic Anatomy encompassing its all the subdivisions
Importance of Histology
Knowledge of histology complements the study of gross Anatomy. It also provides a structural basis for the study of function (i.e, physiology). In addition, knowledge of normal histology is of fundamental importance in understanding the subject of pathology (which deals with alterations in structure and function of the body caused by disease).
Embryology is the branch of Anatomy which deals which the study of human development before birth
The basis of any individual is male & female sex cells, called gametes. Gametogenesis is process of production & formation of male and female gametes. The formation of zygote after union of male and female gametes, the process is called fertilization.
As soon as process of fertilization is completed, the zygote undergoes rapid mitotic segmentation called cleavage. The cleavage results in rapid increase in the number of zygote cells. After 3 to 4 divisions the zygote consists of a solid mulberry shaped ball of 12 to 16 cells, called morula. At the age of 3 days the morula enters the uterus is attaches the Endometrium of uterus. During gastrulation 3 germ layers (ectoderm, mesoderm & endoderm) are produced. They differentiate in to various tissues & organs of the Embryo.
Gestational age comprises 280 days from 1st day of last menstrual cycle to birth or fertilization age is 266 days from fertilization to birth. From the first day to the end of 8th week of intra-uterine life, the developing individual is called embryo. From beginning of 9th week to the birth, the developing individual is called fetus. The subject of Embryology also comprises study of congenital malformations, their diagnosis and possible treatment of these congenital malformations.