The external nose is divided into four parts: nasal root, bridge of nose, tip of nose and alar. The nasal root is a bony part, which consists of two nasal bones and maxillary nasal process. The bridge of the nose is between the root of the nose and the tip of the nose, and consists of two pieces of nasal cartilage. The tip of the nose is the terminal part of the nose, which is mainly composed of two alar cartilages. Each alar cartilage has a medial foot and a lateral foot. The two medial feet form the nasal columella and a part of the nasal tip bracket under the nasal tip, and the lateral feet form two alars on the left and right sides of the nasal tip, and there is nasal septal cartilage on the north side of alar cartilage. The external structure of the nose is from the root of the nose to the columella of the nose, forming a prominent triangular pyramid. The skin covering the upper part of the nose is loose and elastic, and the skin is easy to stretch and expand; The skin covering the lower third of the nose is closely attached to the subcutaneous tissue below, so it is not so easy to stretch and expand the skin. What materials should I use? According to experts, there is no general difference between the materials of male rhinoplasty and female rhinoplasty, but everyone needs to make a good choice and must choose the right one. According to experts, at present, rhinoplasty material is considered to be the most ideal one, which comes from itself and can be said to have a high survival rate. Other materials, such as silica gel, detumescence and injection materials, such as hyaluronic acid, are also very good, but the specific use depends on personal circumstances. However, the prosthetic material also has some advantages: 1, beautiful after operation, true and natural feel, very close to normal nasal tissue. 2. It has a special micropore structure, into which tissue cells and blood vessels can grow to form tissue connection, which is as perfect as autologous tissue. 3. The most prominent feature of the expanded material is that it does not move or deform, can be integrated with the nasal tissue, and will not pierce the skin, which is very safe. 4, light weight, no sense of falling, and no "transparency" of silicone. For these rhinoplasty materials, experts also have the following introduction: 1, silica gel: it is one of the most commonly used prosthetic materials at present, with good operability, easy shaping and good elasticity; Disadvantages: unable to establish blood circulation with the body to form tissue connection. 2, artificial bone: it has an advantage that everyone knows very well, that is, it fits the human body very well; But the texture is too hard, and the local plastic effect of nasal root is acceptable.