Chapter 11 Skin skin is the largest organ of the body, constitutes about 16% of body weight its total surface area is about 1.2-2.2 m2 function: protection, sensory reception, excretion and thermoregulation
Chapter 11 Skin ---skin is the largest organ of the body, it constitutes about 16% of body weight ---its total surface area is about 1.2-2.2 m2 ---function: protection, sensory reception, excretion and thermoregulation
Structure of skin epidermis 角质层 汗腺导管 透明层 dermis 颗粒层 基底层 乳头层 一小动脉 网织层 汗腺导管 Eeg 小静脉 汗深分部 神轻 环以小体 一皮下绀
1. Structure of skin ---epidermis ---dermis
1) epidermis keratinised stratified squamous epithelium consist of keratinised cell and non- keratinised cell
1) epidermis ---keratinised stratified squamous epithelium ---consist of keratinised cell and nonkeratinised cell
① keratinised ce from basal to 角化细胞随 SurTace we can 透明角质颗粒 排入细胞间隙的 板层颗粒内容物 颗粒层细胞 classify the cells 板层颗粒 into five layers 签总一 吞入的黑素颗粒 黑素颗粒 基底细胞 黑素体 lion 黑素细胞 半桥粒 基膜
①keratinised cell: ---from basal to surface, we can classify the cells into five layers
a stratum basale -structure LM: -a layer of cuboidal or low columnar cell with a large, pale N basophilic cytoplasm EM: -free ribosome -keratin filament- tonofilament -desmosome -function: mitotic activity and proliferation
a. stratum basale ---structure: LM: -a layer of cuboidal or low columnar cell with a large, pale N -basophilic cytoplasm EM: -free ribosome -keratin filament- tonofilament -desmosome ---function: mitotic activity and proliferation