Chorion vs Placenta
Chorion thiab placenta yog ob qhov tseem ceeb, uas yog tsim thaum lub sij hawm embryo txoj kev loj hlob. Fetus yog ib qho tseem ceeb rau kev muaj nyob ntawm ob qho no.
Placenta yog dab tsi?
Placenta yog tsim thaum lub sij hawm kev loj hlob ntawm lub embryo. Nws ua raws li lub cev metabolic thiab endocrine kab mob nyob nruab nrab ntawm lub embryo thiab endometrium ntawm lub tsev menyuam. Placenta yog ib qho discoid, oval zoo li lub cev, uas muaj kwv yees txoj kab uas hla ntawm 20 cm thiab thickness ntawm 2-3 cm. Placenta tshwm sim tsuas yog thaum lub sij hawm gestational. Ob lub fetal thiab niam cov khoom sib xyaw ua ke tsim cov placenta. Chorion yog ib feem ntawm fetal, hos uterine endometrium yog cov khoom ntawm leej niam. Lub luag haujlwm tseem ceeb ntawm placenta yog ua raws li kev xaiv barrier, uas kho tag nrho cov kev hloov fetomaternal thiab maternofetal. Nws tswj kev sib pauv dej, oxygen, carbon dioxide thiab metabolic pov tseg ntawm tus menyuam hauv plab thiab niam. Lwm lub luag haujlwm tseem ceeb yog ua raws li lub cev endocrine thaum cev xeeb tub. Cov tshuaj hormones tseem ceeb tshaj plaws ntawm placental keeb kwm muaj xws li hCG, tib neeg placental lactogen (hPL) thiab steroid hormones xws li estradiol, estriol thiab progesterone. Tsis tas li ntawd, placenta secretes ib co tseem ceeb enzymes xws li alkaline phosphatase, diamine oxidase thiab cysteine aminopeptidase.
Chorion yog dab tsi?
Chorion yog ib feem ntawm lub cev xeeb tub. Nws yog tsim los ntawm plaub txheej; cellular txheej (fibroblast), reticular txheej, hauv qab daus membrane thiab trophoblast. Chorion thiab chorionic villi txawv ntawm blastocyst thaum cog. Thaum lub sij hawm cev xeeb tub, chorionic villi txuas ntxiv txhim kho thiab dhau los ua ib feem ntawm cov placenta. Qhov seem ntawm cov chorion, ua ke nrog amnion tsim cov pob tshab fetal membranes.
Qhov txawv ntawm Chorion thiab Placenta yog dab tsi?
• Chorion yog ib feem ntawm lub cev xeeb tub.
