The auricle is located on both sides of the head, and the left and right auricles are basically symmetrical. The upper end of the auricle is flush with the horizontal line above the eyebrow, and the lower end is on the horizontal line through the base of the nose. The angle between the auricle and the side of the skull (auriculocranial angle) is about 30 degrees. The auricle is divided into an anterior lateral surface and a posterior medial surface, with thin, elastic cartilage as a support between the two skin surfaces. The skin on the anterolateral side of the auricle is very thin, with little subcutaneous tissue, and is closely adhered to the cartilage membrane; the skin on the posterior medial side is slightly thicker, with a small amount of loose connective tissue under the skin, and is therefore relatively loose. The auricular wheel is the free edge of the auricular curvature, with a slightly raised nodule above it called the auricular nodule, also known as Darwin’s nodule. The ear wheel terminates forward at the foot of the ear wheel, which lies almost horizontally above the opening of the external auditory canal. There is a bulge in front of the ear chakra that is approximately parallel to it, called the contralateral ear chakra. The contralateral auricle is gradually divided upward and forward into an upper and lower foot, and the depression between the two feet is called the triangular fossa. The ear boat is a long groove between the ear wheel and the opposite ear wheel. The larger depression in front of the opposite ear wheel is called the auricle. The auricle is divided into two parts by the ear wheel feet, the upper part is called the auricle boat and the lower part is called the auricle cavity. In front of the earnail cavity is the mouth of the external auditory canal, and there is a small triangular protrusion in front of it called the ear screen. At the lower end of the anterior part of the auricle, there is a bulge opposite to the auricular screen, and the depression between the auricular screen and the opposite auricular screen is called the interauricular screen notch. The earlobe is at the lowermost end of the auricle and has no cartilaginous tissue, but consists of skin and subcutaneous fat tissue. The auricular cartilage is composed of yellow elastic fiber cartilage plates, and its surface is not flat. The shape is similar to the shape of the auricle, except that there is no cartilage at the earlobe. The auricular cartilage is fixed to the temporal bone by ligaments, mainly the anterior and posterior auricular ligaments. The preauricular ligament starts at the root of the zygomatic arch of the temporal bone and ends at the ear wheel and the cartilage plate of the ear screen. The postauricular ligament starts from the mastoid process and ends at the auricular bulge behind the auricle. The auricular muscles can be divided into the external and internal auricular muscles. The internal auricular muscles are small transverse muscles, generally with 6 pieces. The auricularis major, auricularis minor, auricularis pinna, and auricularis opposite are located on the outer front side of the auricle; the auricularis transversus and auricularis oblique are located at the back of the auricle. There are three extra-auricular muscles, namely the supraspinatus, preauricular and postauricular muscles. The supratrochlear muscle begins at the capitellum and is attached to the posterior top of the auricle, which pulls the auricle upward; the preauricular muscle also begins at the capitellum and ends at the anterior lower part of the auricular pedicle, which pulls the ear forward; the postauricular muscle begins at the mastoid process and is attached to the auricular bulge behind the auricle, which pulls the auricle backward. The movements of the auricular muscles are innervated by the facial nerve. The extra-auricular muscles in humans are generally considered to be degenerative muscles with little activity and almost complete loss of function. However, they play a role in maintaining the position of the auricle and in preventing its prolapse.