Observe the slides below to understand the microscopic structure of skin
1) A-1-c, Thick skin, HE; 2) A-5-a, Thick skin, OsO4; 3) NF-1-c, Thick skin, Pacinian corpuscle, HE; 4) NA-1-i, Caucasian and Negro, Thin skin, HE; 5) 93W7034, Axillary skin, HE, human 6) M-1-o, Scalp, HE; 7) NC-2-a, Finger nail, human, ls.