The upper border of the chest is the lower border of the neck, the lower border is the bony lower thoracic opening, and the outer side is the front and rear edges of the deltoid muscle, which is the second largest body cavity part of the human body. This part is divided into two parts: chest and chest content; The thoracic cavity is divided into chest wall and diaphragm; The chest wall is divided into front wall, side wall and back wall by axillary front line and axillary back line, in which the back wall is called back and belongs to spine area; The contents of the chest cavity are divided into the middle mediastinum and the lungs and pleura on both sides.

The boundary of the chest, the division of body surface marks and chest mark lines. The characteristics of superficial and deep fascia of chest wall, the distribution and communication of superficial veins, the distribution of cutaneous nerves and the composition of inherent chest wall. Body surface projection of lung and pleural fold lines, body surface projection of heart and great vessels and their clinical significance. The body of the chest is almost dominated by fat. Besides fat, the biggest part of the chest is the breast.

Chest wall:

The position, shape, structural characteristics, lymphatic flow direction of female breast and its clinical significance. The name, position, shape, starting and ending, innervation and function of anterior chest wall muscle, the composition and hierarchical relationship of intercostal space, the name, position, structural characteristics, starting and ending, innervation and function of intercostal muscle, the distribution of intrathoracic fascia, the course of intrathoracic artery and its clinical significance. The name, position, shape, starting and ending, innervation and function of back muscles.

Pleural cavity:

Observe the shape of pleura, the composition and anatomical characteristics of pleural cavity, the position of pleural apex and pleural sinus and its clinical significance. Composition of lung roots and arrangement of ducts. The position, shape, structure and function of trachea, main bronchus and lobar bronchus. The position, shape, lobulation of lung and its relationship with intrapulmonary bronchi, the name and course of segmental bronchi, the shape, structure and clinical significance of segmental bronchi.