Cov epidermis yog txheej nyias ntawm qhov chaw uas txawv ntawm qhov tuab ntawm 0.05 hli ntawm daim tawv muag mus rau 1.5 hli ntawm xib teg ntawm taw. Tab saum toj ntawm cov epidermis hu ua cornified txheej, thiab nws muaj thickened squamous hlwb.
Cov txheej txheem ntawm daim tawv nqaij tuaj yeem nyob ntawm Cornified?
The stratum corneum yog txheej txheej sab saum toj tshaj plaws ntawm cov epidermis thiab yog txheej txheej tawm mus rau sab nraud (saib daim duab 5.5). Qhov nce keratinization (tseem hu ua cornification) ntawm cov hlwb hauv txheej no muab nws lub npe. Feem ntau muaj 15 mus rau 30 txheej ntawm cov hlwb hauv stratum corneum.
keratin txheej nyob qhov twg?
Koj daim tawv nqaij yog txheej txheej ntawm daim tawv nqaij uas koj tuaj yeem pom thiab kov. Keratin, ib qho protein nyob hauv cov hlwb ntawm daim tawv nqaij, ua rau cov hlwb ntawm daim tawv nqaij thiab, nrog rau lwm cov proteins, sticks ua ke los tsim cov txheej txheem no.
malpighian txheej ntawm daim tawv nqaij nyob qhov twg?
Malpighian txheej (stratum germinativum) Txheej sab hauv ntawm lub epidermis ntawm mammalian daim tawv nqaij, sib cais los ntawm lub hauv paus dermis los ntawm ib tug fibrous qab daus daim nyias nyias. Nws tsuas yog nyob rau hauv cov txheej txheem ntawm epidermis uas active cell division (mitosis) tshwm sim.
Malpighian txheej ntawm daim tawv nqaij yog dab tsi?
Cov Malpighian txheej yog tsim los ntawm ntawm cov germinative (basal) hlwb uas muaj mitotically active, melanocytesuas muab cov tawv nqaij nws cov xim tan, thiab cov hlwb uas muaj spiny projections. Yog li ntawd, Malphigian txheej muaj xws li ob qho tib si germinative (basal), granular thiab spinous txheej ntawm epidermis.
