The Iceni
Medical Moderator
Durrr? I'm the lowest of the low - a primary care physician. You're more of an ENT man that I am. If I remember correctly dental students spent as much time on the head and neck as we did on the whole body when we studied anatomy.Laurence Stein DDS once bubbled...
But, hey, Dr. Paul, help me out here.
It never ceases to amaze me just how much anatomy most people do know but also how little they really know (and this is not meant to be any criticism of you, Grajan.)
My comment
was intended as a description of what is seen in the section to help decipher it, as I admit it took me a little while to identify the eye sockets, so I imagined most could find the diagram quite incomprehensible.Thus the frontal sinuses are seen at the top above the eye sockets (which do not connect with the nose and do not have a mucosal lining), and with the maxillary sinuses each side immediately below the eyes with openings pointing upwards into the nasal cavity.
Yes indeed, Graham. While I am sure any embryologist would disagree to my simple mind the sinuses are an internal structure (in that they lie entirely within the skull in communcation with the respiratory tree and are lined with mucus membrane), whereas the orbit is separate from the nasopharynx. The nasolachrymal duct is a part of the "skin" and mostly lies outside the bones of the skull draining the external eye.
The tear glands are specialised sweat glands that continuously lubricate the eyeball. (Without tears the cornea dries out and can become scarred (which can cause blindness). An example of a deficiency in tear production is Sicca syndrome which requires the use of artificial tears.) Tears drain through the nasolacrymal duct, which starts at the punctum of the eye, the little bulge found at the medial end of the lower eyelid. This is why we have a runny nose when we cry (and why Graham finds fluid in his eye when he blows his nose). I am no ENT surgeon, so I am not sure how common the later finding is. The ENT man should be told, though.
A nasolalrymal duct is often blocked in babies, causing a "sticky eye" but it almost always clears with massage, lubrication and time.
By the way. Were you aware that the function of the sinuses is to lighten the skull as air is considerably lighter than bone?
You are so right to be frustrated with Joe Public's expectaion of HMOs. Larry. We have one big one over here. It is called the National Health Service.
"You can have every medical care you need as long as NHS bureaucrats consider you need it".