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Development of Stomach
The stomach develops in fusiform dilation in the foregut between the oesophagus and the intestine. Earlier it has an – Anterior border -Posterior border - Left and Right surfaces With the further development and diffrential body growth it turns to the right side by 90degree.
Continue reading...Development of ADRENAL GLAND
18. September 2008
The adrenal gland consists of a superficial cortex and deeper medulla. The cells of the cortex arise from the coelomic epithelium that lies on the angle between the developing gonad and the attachment of the mesentry. The cells arising from the coelomic epithelium may be divided into two groups.
Continue reading...Development of INFERIOR VENA CAVA
18. September 2008
Right and left posterior cardinal veins which drain the caudal part of the body walla anastomose with one another. Later another longitudinal venous channel is formed in the developing mesonephros. It is called sub-cardinal vein. This opens above and below into the posterior cardinal vein. Renal vein draining the kidney opens into the sub-cardinal vein.
Continue reading...Development of Portal Vein
18. September 2008
A) The proximal parts of the two vitelline veins lie on the right and left sides of the developing duodenum. B) The veins soon become interconnected by three transverse anastamoses two of which lie ventral to the duodenum. The third anastomoses lies dorsal to the duodenum and is between two ventral anastomoses.
Continue reading...Development and Descent of OVARY
17. September 2008
The early stages in the development of ovary are exactly the same as in the testis. a) The coelomic epithelium on the medial side of mesonephros becomes thickened to form genital ridges. b) Cords of cells proliferate from this germinal epithelium and grow into the underlying mesoderm. c) Primordial germs cells, that are formed in [...]
Continue reading...Reason for the Descent Testis
16. September 2008
a) Due to pull from fibro-muscular band Gubernaculum testis. b) Due to diffrential body growth itself
Continue reading...Development and Descent of Testis
16. September 2008
On either side of the midline between the dorsal mesentry and the mesonephrons the wall of the coelomic cavity thickness to form genital or gonadal ridge. From this ridge the cells proliferate testicles as cords. These cords grow towards mesonephric tubules and communicates with few mesonephric tubules.
Continue reading...Paramesonephric Duct or Mullerian Duct
16. September 2008
IN FEMALES- It is predominant in females develops from the intermediate mesoderm. It is present parallel and lateral to mesonephric duct. It is divisible into three parts upper vertical part, middle horizontal part and lower vertical part. The caudal part unites with one another and forms utero-vaginal canal. The upper not united part gives rise [...]
Continue reading...Mesonephric Duct or Wollfian Duct and Prostate Development
16. September 2008
DEVELOPMENT OF PROSTATE- It is present only in males. It develops from both endo and mesoderm. It develops a number of outgrowths around the prostratic urethra. In females the part homologous to it is the paraurethral glands of skene. MESONEPHRIC DUCT (or) Wolfian duct- It is predominant in males . The duct forms the duct [...]
Continue reading...Development of Urethra
16. September 2008
DEVELOPMENT OF MALE URETHRA- a) The part of the male urethra extending from the urinary bladder upto the opening of ejaculatory ducts is derived from the caudal part of the vesico-urethral canal (endoderm). The posterior wall of this part is derived from the absorbed mesonephric ducts (mesoderm). b) The rest of prostatic urethra and the [...]
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18. September 2008
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