What Is a Skin Pack?

An organ that is covered on the surface of the body and directly contacts the external environment. It has the functions of protecting, excreting, regulating body temperature, and feeling external stimuli. It is the largest organ in the human body.

An organ that is covered on the surface of the body and directly contacts the external environment. It has the functions of protecting, excreting, regulating body temperature, and feeling external stimuli. It is the largest organ in the human body.

Chinese name

skin

Foreign name

skin

Structure

Skin consists of epidermis and dermis

Features

Has important barrier protection

Skin overview

The skin is divided into two layers, the epidermis and the dermis. The epidermis is on the skin surface and can be divided into two parts, the stratum corneum and the germinal layer. The keratinized cells form the stratum corneum, which becomes dandruff after shedding. Germinal cells continue to divide and can replenish the stratum corneum. The germinal layer contains melanin cells, which produce melanin that prevents UV rays from damaging internal tissues. The epidermis is a stratified flat epithelium, while the dermis is a dense connective tissue with many elastic fibers and collagen fibers, so it has elasticity and toughness. The dermis is thicker than the epidermis and has abundant blood vessels and nerves. There is subcutaneous tissue under the skin, which is a loose connective tissue with a large number of fat cells. The skin also has many appendages such as hair, sweat glands, sebaceous glands, fingernails.

Skin anatomy explanation

Refers to tissues that cover the surface of the human body and are in direct contact with the external environment. With protection, feeling, secretion, excretion, breathing and other functions. Combining the epidermis and dermis. epidermis. It is composed of stratified flat epithelium, which is from stratum corneum, transparent layer, granular layer and germinal layer in order from shallow to deep. The stratum corneum is composed of multiple layers of keratinized epithelial cells (nucleus and organelles disappear, and the cell membrane is thicker). It is lifeless, water-tight, and has the functions of preventing tissue fluid from flowing out, resisting friction and preventing infection. The cells in the germinal layer continue to proliferate and gradually migrate outwards to supplement the continuously exfoliating stratum corneum. The germinal layer contains a type of melanin cell that produces melanin. The color of the skin is related to the amount of melanin. The dermis is composed of dense connective tissue, and the papillary layer and the reticular layer are in order from shallow to deep. There is no obvious boundary between the two layers. The thickness of the dermis is about 0.07 to 0.12 mm; the dermis of the palms and feet is thicker, about 1.4 mm; the eyelids and tympanic membranes are thinner, about 0.05 mm. The nipple layer is connected to the germinal layer of the epidermis, which is rich in capillaries, lymphatic vessels, nerve endings and tactile bodies. The reticular layer is connected to the subcutaneous tissue, and it is rich in collagen fibers, elastic fibers and reticular fibers. They are interwoven with each other to make the skin more elastic and tough. The reticular layer is also rich in blood vessels, lymphatic vessels and nerve endings.

The skin covers the entire body surface and is one of the largest organs in the human body, accounting for approximately 16% of body weight. Adult skin area is about 1.2-2.0 square meters. The thickness of the skin varies throughout the body. The back, neck, palms, and soles are the thickest, and the armpits and face are the thinnest, with an average thickness of 0.5-4.0 mm. Although the thickness of the skin varies from place to place, it can be divided into two layers, the epidermis and the dermis, and is connected to the deep tissue by the subcutaneous tissue. Skin color varies by race, age, and health. The skin has very dense concave grooves of various directions, called the sulcus. The rhombic or polygonal ridges of varying sizes between the pits are the skin ridges, which form fingerprints on the fingertips. Fingerprint morphology is different between individuals, so fingerprints have individual differences. There are different lengths of hair on the skin. There are nails and toenails at the ends of the limbs. The skin secretes sweat and sebum, which is secreted by sweat and sebaceous glands.