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CC GIAI ON HNH THNHV PHT TRIN

MM RNG

TS. V Trng Nh Ngc

Trng B mn Rng Tr Em

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C sn

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MC TIU HC TP

1. Trnh by c qu trnh hnh thnh lrng.

2. Trnh by c qu trnh hnh thnh nrng

3. Trnh by c qu trnh hnh thnh cc nbiu b rng sa.

4. Trnh by c qu trnh hnh thnh nbiu b cc rng vnh vin thay th.

5. Trnh by c cc thnh phn cu to cac quan hnh chung.

6. V s cu to ca c quan hnh chung

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hinh thanh rang.wmv

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Cc giai on hnh thnh mmrng

Lrng

Nrng

Mrng

Chungrng

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Cc Giai on Hnh Thnh v

Pht Trin Ca Mm Rng

-3 giai on pht trin ca mm rng ?

- Phn chia giai on theo din bin hnh thi

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L rng-nhng biu hin u tin

S t tp ca ngoi trung m ngay st di biu mnim mc ming

Khi ngoi trung m xut hin th n c tcdng gy cm ng i vi biu m nimmc ming, t chc ny s pht trin v cnhng biu hin u tin v hnh thi mta c th nhn thy c trong bc u

ca s hnh thnh rng.

S t tp ca mch mu vng s hnh thnh rng.

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L Rng

Bm nm ming pht trinxung trung m hnh thnh 2l biu b song song, l tinnh (A: pha trc), l rng

vo tun th 7 (B: pha sau)

Khi bm nm ming pht trin dyln, n s tin su vo trung m di hnh thnh nn bctng ln biu b, mt li shnh thnh l rng tin pht, bmt t bo thoi ho to thnhngch li

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Giai on N Rng

A: tc men

B: trung m t c

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N Biu B Rng Sa

Tun 6-8

Xut hin10 n biub ca mm

rng sa b t doca l rng

- N biu b hm di xut hin sm hn hm trn.

- Cc n biu b c xu hng pht trin tch ri khi l rng, mt vi ch cal rng, t bo ngng pht trin v b rch i

- N caRHS 1 xuthin trcRHS 2

- N biu bngy cngtch xa lrng, dyni gia nbiu b v l

rng b t

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N Biu B Ca Cc Rng CiLn Vnh Vin

Hnh thnh t on pht trin ko di v

pha xa ca l rng N biu b RCL 1 xut hin ngay cnh mt

xa ca mm RHS th 2 (thng th 3-4)

N biu b RCL 2: thng th 9. Rng khn: 4 tui

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Rng ci ln vnh vinRng Sa ?

Rng vnh vin?

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Giai on M Rng

Mm rng bao gm:- C quan men.

- Nh rng

- Bao rng

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Giai on M Rng

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Giai on hnh chung: giai on bit ho

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C quan hnh chung

- S tip xc gia biu m men lp trong

vi t bo ca nh rng xc nh hnh thtng lai ca thn rng.

- Bit ho to thnh nguyn bo to men,nguyn bo to ng cng nh mt chuicc t bo khc ca mm rng

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C quan hnh chung

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Biu M Men Lp Ngoi

Vng gp ca c quan to men. Vng nyl mt vng quan trng c tc dng cmng,ng thi l vng xy ra phn chia TB

hnh thnh cc tin to men bo mi.Vng ny s hnh thnh bao Hertwig ctc dng cm ng hnh thnh chn rng.

BM men lp ngoi c th gi vai tr kimsot trong s trao i cht gia c quanto men v mi trng bn ngoi

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Li T Bo Hnh Sao

Vai tr c hc: tchc m, gikhong cho s hnh

thnh thn rng Vai tr dinh dng:

cung cp cht dinhdng cho nguyn

bo to men

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Lp Trung Gian

Gm 3-4 lp t bophng, lng tr agic v tng i

gn nhau. Lp nynm k cn vibiu m men lptrong.

Vai tr: tham gia vo qu trnh vi ho men rng.

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Biu M Men Lp Trong

Gm mt hng TB hnh tr thp (rng khong5m, cao 25-30m), c nhn hnh bu dc vcc bo quan phn tn trong bo tng. NhngTB ny lin h vi nhau bng cc th ni v

nhng khp khe. Bn trong t bo c chanhiu acide phosphatase v duy tr hot ngphn bo cho n khi bit ho thnh nguynbo to men, cc nguyn bo to men khi chatit men th c gi l tin nguyn bo to

men. Vai tr: cm ng t bo ngoi vi ca nh rng

bit ha thnh nguyn bo to ng

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