human skin. pilosebaceous unit

all arrector biological biology cell center components cross cytological cytology dermis epidermis epithelial epithelium fibers follicle gland glands hair hematoxylineosin henle histological histology human huxley hyaline keratinocytes layer masson melanin melanocytes micrograph microscope microscopic microscopy muscle paraffin photomicrograph pigment pili pilosebaceous root scalp sebaceous section shaft sheath showing skin smooth stain surrounded tissue unit