Why put the three organs of otolaryngology together to make a department?

I say two words; As some netizens said, the department of otolaryngology is divided into one department and the four organs of otolaryngology are divided into one discipline. One of the main reasons at first was that these four organs were anatomically understandable. In addition, historical reasons are also very important, or this is caused by historical reasons. Historically, otolaryngology is a part of the science of five senses, which is about the five senses. Later, with the development of science and medicine, the division of disciplines became more and more detailed, and stomatology and ophthalmology were independently developed in the ENT department, so an "Otolaryngology Department" was left. In other words, the division of disciplines is dynamic and changes with the changes of the times (and regions-countries, etc.). For example, with the development of otolaryngology, it evolved into "otolaryngology head and neck surgery". Nowadays, in addition to the traditional and classic "otolaryngology", otolaryngology also includes "head" (especially the lateral skull base and ear nerve) and neck surgery. For example, the thyroid gland (surgery) located in front of the neck belongs to the general surgery category, but now many hospitals' otolaryngology departments also carry out thyroid surgery, and for many reasons, otolaryngology departments still have advantages in carrying out thyroid surgery. Parotid surgery, which originally belonged to oral and maxillofacial surgery, was also carried out in some hospitals. Briefly talk about these for the reference of the subject and everyone.