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Now entering USMLE_Step_1 subroom.

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[usmlear] hi drkittu

[drkittu] hello

[usmlear] r u here for embryo discussions?

[drkittu] no I am just browsin through this site

[drkittu] is there any chat session going to begin now

[usmlear] yes

[usmlear] it was for embryo

[drkittu] what time

[usmlear] 9.00 am et

[drkittu] but its already 9.25 rihgt

[usmlear] biochemistry is at 10.00pm ET

[usmlear] yes

[usmlear] today is the first day

[drkittu] oh k

[usmlear] I am not sure,how many ppl know?

[usmlear] it is posted in chat forum

[usmlear] it is at valuemd site

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[usmlear] hi yousef

Yousef has joined subroom: Main Room

[usmlear] u want to join in step_1 room?

[drkittu] yeah

[usmlear] ok

[drkittu] tell yousef to

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[usmlear] ok

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[usmlear] hi yousef

[usmlear] are u ready for embryo?

[Yousef] hello

[drkittu] Usmlear I am not prepared for this session. I will be watching

[usmlear] we r only 3

[drkittu] I will come prepared from tomorrow and for tonights bio

[usmlear] so we can try to ans

[usmlear] its not tough topic though

[usmlear] ok,lets begin

[usmlear] what will happen in absence of testosteron?

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[usmlear] ?

[usmlear] Wolffian ducts will regress and fail to differentiate into normal male internal reproductive tracts.

[drkittu] yeah

[usmlear] geno will be male but pheno..female

[usmlear] in absence of MIH?

[usmlear] Müllerian ducts will automatically differentiate into oviducts and a uterus.

[drkittu] ok

[usmlear] even geno is male

[usmlear] what is dysjunction?

[drkittu] splitting of centomere

[usmlear] the seperation of 46 homologous chr without centromere splitting.

[drkittu] during meiosis

[usmlear] nondysjunction has splitting..in downs

[drkittu] ok

[usmlear] nondysj. happens in either first or second meiotic div

[usmlear] failure of chromatids to seperate

[usmlear] thats how..trisomy dev

[drkittu] Yeah

[usmlear] what is gen. recombination?

[usmlear] physical exchange of chromatid segment..at meiosis I

[drkittu] ok

[usmlear] why not in Mitosis?

[drkittu] No crossing over

[usmlear] bec in mito..homologous chr. do not pair & gen recomb does not occur.

[usmlear] rt

[usmlear] no cross.

[usmlear] chr. no. in sec oocyte?

[drkittu] 23, 2n

[usmlear] yes

[usmlear] what cells have 46 ,2N?

[drkittu] primary spermatocyre, pri oocyte

[usmlear] primordial germ cells,oogonia,spermatogonia,zygote,blastomere

[drkittu] ok

[usmlear] pri. sperm. & pri. ooc..have 46 4n

[drkittu] k

[usmlear] mature oocyte?

[drkittu] 23,1n

[usmlear] 23,1n

[usmlear] yes

[drkittu] secondary oocyte loose barbody and forms mature oocyte rihgt?

[usmlear] what remain arrested in prophase of meiosis I?

[usmlear] rt

[usmlear] and it happens at ferti.

[drkittu] ok

[usmlear] whats the ans of my q..arrested at pro.?

[usmlear] pri. oocyte..till puberty

[drkittu] oh ok

[usmlear] at puberty..meiosis completed..sec oocyte forms

[drkittu] yeh right

[usmlear] now..sec oocyte arrested in metaphase of meisosi II..till ovulation...this meiosis completed at fertilization

[drkittu] k

[usmlear] hi richtian

[usmlear] we r discussing embryo..initial chapters

[usmlear] from kap notes

[richtian] hi, I am a new here

[usmlear] its fine

[usmlear] what r the events during first wk of embryo development?

[richtian] it is over, or not start yet

[usmlear] mitotic div of clevage,formation of blastocyst & implantation

[drkittu] Zygote formation

[drkittu] clevage

[drkittu] blastocyst formation

[usmlear] it starts from 9.00am ET till 10.00am

[usmlear] rt

[richtian] sorry I miss the majority

[usmlear] what forms placenta?

[usmlear] no richtian..u didn't miss much

[usmlear] it was first day..we started late

[usmlear] but from tomo.,come early

[usmlear] at 9

[richtian] anyone know how chorionic cavity form?

[usmlear] chorio. in second wk

[richtian] I hope I can catch it. I am working full time and being watch constantly.

[richtian] how is the formed. what is its fate

[richtian] oops, how is chorionic cavity formed?

[usmlear] chorion consist of extraembr. somatic meso,cytotropho.,syncytotropho.

[usmlear] The chorionic cavity appears during the second week of development as vacuoles within the extraembryonic reticulum (between the yolk sac and the cytotrophoblast) coalesce into a single cavity.

[richtian] i think you are right.

[usmlear] As this is occurring, migrating cells of extraembryonic mesoderm become associated with the inner surface of the cytotrophoblast and the outer surface of the yolk sac.

[richtian] what is its relationship to the attachment site of placenta

[usmlear] Thus, the lining of the chorionic cavity consists of extraembryonic mesoderm.

[richtian] very good point

[usmlear] thx

[usmlear] attachment site of placenta?

[richtian] so at somepoint you should see three cavities?

[usmlear] can u expl. this ric?

[usmlear] yes..amniotic,yolk sac & chrionic

[richtian] I wonder what is the relationship between chorionic cavity and placenta/

[usmlear] yolk sac...is formed by transformation of the blastocyst cavity as extraembryonic endoderm

[usmlear] chor. cav. has a connecting stalk

[richtian] you are quite good, man

[usmlear] syncytio & cytotropho...which forms trophoblast which eventually dev. into placenta

[usmlear] thx

[usmlear] its 1 hr passed now

[richtian] do you need to know any molecular machanism of embrogenesis/

[usmlear] hopefully we will meet tomo. in time

[usmlear] no mole mech

[richtian] could you please post the transcript, please.

[drkittu] Yes.. I will come prepared tomorrow. Thanks usmlear

[usmlear] just these formation of diff layers..origins etc

[usmlear] thx drkittu

[usmlear] and richtian

[richtian] I will try tomorrow,

[usmlear] we will meet tomorrow..pl. check the schedule

[usmlear] in valuemd chat forum

[drkittu] sure. Thanks bye usmlear and richtian

[usmlear] bye & have a nice day

[richtian] buy

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