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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

5

8

7

61

2

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9

11

10

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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14

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13

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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