Ht Than Rang
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Transcript of Ht Than Rang
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S Hnh Thnh Thn Rng
v Chn Rng
TS. V Trng Nh NgcB Mn Rng Tr Em
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MC TIU HC TP
Nu c 3 vai tr ca c quanto men trong shnh thnh thn
rng. Trnh by c qu trnh hnhthnh thn rng
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S Hnh Thnh Thn RngVai tr ca c quan to men:
To iu kin cho lp t bo ngoi bin canh rng bit ho tr thnh nguyn bo tong.
Bn thn n to ra lp men ph ngoi thn
rng. To ra vng gp ca c quan to men m
bo hon chnh s hnh thnh thn rng.
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S Hnh Thnh Thn Rng
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S Hnh Thnh Thn Rng
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S HNH THNH CHN RNG
Trnhby c shnh thnhbaoHertwig.
Trnhbyccutoca baoHertwig
vshnhthnhchnrng. V c s cutoca baoHerwig
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S HNH THNH CHN RNGS hnh thnh bao Hertwig Khi TR hnh thnh, vng gp ca CQTM vn
cn pht trin nhng khng bao gi bit hothnh nguyn bo t o men bo mi, mhnh thnh mt l biu b gm 2 lp BM. Lny pht trin theo hng thng ng i suxung t chc lin kt pha di to thnhmt bao BM gi l bao Hertwig (cn gi lbao Von Brnn).
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S HNH THNH CHN RNG
Lp li
Ty rng
Biu m men lp ngoi
Np gp c
Ti rng
Biu m men lp trong
Lp trung gian
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Bao Hertwig
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H nh :1: Men rng; 2:Li t bo hnh sao; 3: Biu m men lpngoi; 4: nguyn bo to men; 5: Lp t bo trung gian;6:Ng rng; 7: nguyn bo to ng; 8: ty rng; 9: Biu mmen lp trong; 10: Bao Herwig
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Cu to bao hertwig2.1 Lptrong Lp trong ca bao Hertwig l lp biu m ni tip vi biu m
men lp trong, lp ny khng cn kh nng bit ho trthnh nguyn bo to men nhng vn cn tc dng cm ngvi lp t bo ngoi vi ca hnh rng lp ny tr thnhnguyn bo to ng. Lp ny hnh thnh s to nn lp ngchn rng.
2.2Lpngoi Lp ngoi ca bao Hertwig l lp biu m lin tip vi biu m
men lp ngoi. Lp ny khng c nh hng g n t chc
lin kt chung quanh. Khi g chn rng hnh thnh th bao Herwig bt u
thoi ho
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Cu to bao hertwig1
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1: Men rng; 2: Nguyn bo to men 3:Lp trunggian; 4: Ranh gii men ng;5: Ranh gii men-x mngtng lai; 6: TB Malassez cn st li; 7: Bao BMHerwig b tiu i; 8: ng thn rng; 9: Nguyn boto ng; 10: Ty rng; 11: ng chn rng; 12: BM men
lp trong; 13: BM men lp ngoi
1: X mng, 2: Nguyn bo to x mng; 3: x mngbo; 4: TB ti rng ang bit ho thnh x mng bo;6: hnh thnh cc dy chng quanh rng, 7: TBMalassez st li, 8: xng rng; 9: Nguyn bo tong, 10: Tin ng; 11: Ng chn rng; 12: ranh gii xmng-ng; 13:ty rng; 14: Cementoid
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S Hnh Thnh Chn Rng
H nh :A: Bao biu b chn rngB: Nh rngC: L chp rng tin phtD: Ti rngE: S pht trin ng chn rng
F: Lp nguyn bo to ng
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S Hnh Thnh Chn Rng
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S Hnh Thnh Chn Rng
Khi lp ng chn rng hnh thnh, bao
Hertwig thoi ho. Bao ny s thoi ho mti tng phn v cn li nhng di tch lnhng m biu m nh t chc quanhcung rng gi nhng mnh vn biu bM
alassez. Nhng mnh vn biu m nytrong nhng iu kin nht nh s c thpht trin thnh cc u hoc nang do rng vng cung rng.
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