Medicine and Health related Information

a) Due to pull from fibro-muscular band Gubernaculum testis. b) Due to diffrential body growth itself

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.

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 [...]

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 [...]

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 [...]

DEVELOPMENT OF URINARY BLADDER- Mainly the urinary bladder develops from the vesico urethral canal. The trigone of the bladder develops from mesonephric duct. It is mesodermal in origin. The allantois diverticulum may contribute to a part of urinary bladder. In adult it is converted into urachus which forms medial umblical ligament.

This is a small diverticulum given off from the lower part of mesonephric duct. This bud grows towards the metanephros and gives rise to collecting system. As the uretric bud is growing towards the metanephric blastema its growing end becomes dilated to form Ampulla, which repeatedly divides. Collecting system of the kidney 1) Ureter 2) [...]

Verterbrate kidney development passes through 3 stages- a) PRONEPHRONS- The intermediate mesoderm in the cervical region develops into 1st kidney called pronephros. In man this kidney is not functional. It soon disappears. It is found in cytosomes and fishes. A nephric duct if formed in relation to the pronephrons, which extends to cloaca and persists [...]

DEVELOPMENT OF OESOPHAGUS- It develops from the foregut between the pharynx and stomach. The oesophagus is at first short but elongates with the formation of neck, with the descent of diaphragm and enlargement of pleural cavities. The abdominal part of the oephageal muscles develops from splanchnopleuric layer of mesoderm. Hence in this part the muscle [...]

DERIVATIVES OF FOREGUT- 1) Part of the floor of the mouth including the tongue. 2) Pharynx 3) Various derivatives of the pharyngeal pouches and the thyroid. 4) Oesophagus 5) Stomach 6) Duodenum- whole of the superior part and upper half of descending part 7) Liver and extra hepatic biliary system