25 Weeks Fetal Development

Conceptus and fetal development in mammals

By Wani Wani and Ghulam mohyuddin Gazanfer

The cleavage in mammals

Four maternal-effect genes (MEG), ie

(I) Zygote arrest I (Zari)

(Ii) Maternal Antigen that the embryo requires (MATER)

(Iii) growth differentiation factor 9 (GDF 9)

(Iv) bone morphogenetic protein 15 (BMP 15)

The factors named above were determined in the sheep oocyte and in vitro produced bovine embryos prior to implantation. The existence of Zari and MATER were in the abundance of ovine immature oocytes than in zygotes cleaved, or more morulae developed forms.With maturation and transition Maternal-Fetal transcripts of these four genes have not resumed. Even the activation of the genome has not helped to restore their transcription. Does that mean these MEG easily determine opening or cleavage is postulated by Daniel Baber, Baber, D et al 2008 Reproduction Fertility and Development 0.20 (8): 908-915

expression pattern of zygote arrest I (Zari), maternal antigen that embryo requires (MATER), growth differentiation factor 9 (GDF 9) and bone morphogenetic model 15 (BMP 15) genes in sheep oocytes and in vitro produced pre-implantation embryos. Bebbere, D, Bogliolo L, Aril, F, Times, S, Leoni, GG, Naitana, S and Ledda, S 2008.

The arrangement and the formation of the placenta, umbilical cord in sheep as an example of the differentiation of placental mammals can be found from our results (Wani et al. 2006, Khatun 2007). Conceptus or fetus takes oxygen from the mother's blood, through the umbilicus, this necessiciates a special mechanism of capillary network interwoven on the fetal amnion. This consultation junction of capillary gives an impression of a large telephone exchange embedded in the junction, the junction of the sub, joints and networking. The actual separation of the fetus and amniotic covers the provision of training of cotyledons and unions, with maternal epithelium can be seen in Figures 25-30. a series of age wise development of the fetus can be seen in the figures. A new method for determining the age of the fetus has been evolved and is known Wani-Khatun determining the age of the fetus Sharh (Table 2). The crown-rump length was replaced by the formula length of the fetus. This chart should help estimate the human and animal gynecologists to determine the age of the fetus to ultrasound.

Organ development in the fetus starts at around day 25. some parts of the fetus can be seen even earlier in the figures and mentioned in the previous page. Organ development in humans is also

Day 25: The head and trunk arm saw tiny buds in the leg bud

In early embryos: a tail, which appears to be a protective coating

For the spinal cord. This tail like protecting the spinal cord can also be seen in developing sheep fetus. This protection ensures the safety of the brain, spine and spinal cord.

The human fetal heart begins beating around 21-25 days. heartbeat of sheep have been recorded using equipment ultrasonogrphic as easily as 25 days (Wani and Sahni, 1981, Wani, 1981, 181, 1984). The length of the fetal crown-vump 29 days / conceptus is 5.0mm. the fetus has one month;

• ¼ inch diameter has a brain, eye, mouth, kidneys, liver, heart, umbilical cord

Second month fetus

size 44 mm (maximum 42 days fetus measured 23 mm. fingers are identified eyes and ears, giving the retina and appear to develop the first eye and inner ear outer ear. hearing and balance mechanism. The meaning of hearing is established. cartilaginous skeleton, but full formed. The framework of the cartilaginous skeleton of the baby (exactly as described in the Koran Surrah Momineen.