Which part of the EAC is more sensitive to pressure?

The deeper two-thirds of the external auditory canal (EAC) are more sensitive to pressure due to the presence of a denser concentration of nerve endings and the differences in the structure compared to the outer third. In this region, the surrounding tissues are more involved in the sensation of pressure and discomfort. This part of the EAC also has a lining of skin that is thinner and more vascularized, which could contribute to a heightened sensitivity to pressure changes.

The outer third of the EAC is primarily composed of cartilage, making it less sensitive to pressure sensations. It is designed to protect the more sensitive inner portions of the ear without being overly responsive to minor changes or stimuli. The medial one-third serves more of a pathway function rather than being primarily sensory, while the bridge area, which is typically where the cartilaginous portion meets the bony portion, also does not have a direct role in pressure sensitivity. Understanding these anatomical differences is crucial for recognizing how discomfort or pressure might be perceived in various parts of the EAC.