Costophrenic Sinus

The costophrenic sinus is a depression between the diaphragm and adjacent ribs that allows the diaphragm to contract and expand freely during breathing. This depression has the shape of a triangle and is located on the front surface of the chest, between the seventh and eighth ribs.

The costophrenic sinus is formed by three layers of tissue: skin, subcutaneous tissue and muscles. The skin and subcutaneous tissue form the superficial layer, and the muscles form the deep layer. Between these layers is a layer of connective tissue that provides strength and flexibility to the sinus.

The functions of the costophrenic sinus include transmitting movements of the diaphragm to and from the ribs, as well as providing space for the passage of blood vessels and nerves. The costophrenic sinuses play an important role in breathing as they allow the diaphragm to move freely and efficiently during inhalation and exhalation.

Conditions associated with the costophrenic sinus may include infections, trauma, tumors, and other diseases. Diseases of the costophrenic sinuses may cause chest pain, shortness of breath, cough and other symptoms.

Various methods can be used to treat costophrenic sinus disease, including medication, surgery, and physical therapy. In some cases, consultation with a specialist surgeon or pulmonologist may be necessary to determine the most effective treatment.

**The costophrenic sinus** is a depression in the costal pleura between the rib and the diaphragm through which the nerve and vessels of the diaphragm pass. The costal sinus is involved in the formation of lymph nodes and lymphatic channels of the lungs and chest. Based on the nature of the path and the method of blood supply, it is possible to distinguish several groups of sinuses.

**The following features of this recess are also highlighted**: 1. location in depth. It is located close to the posterior surface of the diaphragm, and when moving away from the rib, it is located along the posterior surface of the middle axillary artery. 2. sizes. The costal sinus is small, its depth does not exceed 7 mm, but it is within the normal range. The average length is 30–40 mm. Some sources provide data that the length can reach from 32 to 55 mm. The width of the sinus is also relatively small. The greater half of the sine is approx.