1) Because if you spell sinus backwards, it becomes sinus which in latern means inter galctual head smetis.
2) According to my knowledge, the 'sinus' was originally called the 'inf-inf' based on its anatomical root, however as medicine evolved, it led to many misdiagnosed cases of speech impairments and hours of unnecessary therapy for sick patients who would visit the town doctor or shaoman and seek treatment for their inf-inf infection. Once this complication was recognized, it was renamed to avoid future confusion using the name of the discovering doctor, Mr. Sinus Smetis.
A sinus infection, or sinusitis.
When the heart is functioning properly the sinus node controls the firing of action potential that contract the heart. When the sinus node dominates the heart will contract in a synchronized and effective rhythm This is called sinus rhythm.
The opening of the coronary sinus is guarded by a flap of tissue called the Thebesian valve. This valve helps prevent backflow of blood from the right atrium into the coronary sinus.
It's called the subcapsular sinus
There are people who say sinus doctor when they see a doctor treating a sinus patient, but I wouldn't say a sinus doctor, because a doctor who treat sinus patients also treat general ear, nose, and throat problems.Allergy doctors called as an allergist or an immunologist; these doctors can treat a sinus patient too.
SA node (Sinus Node)
paranasal sinus include frontal sinus, the maxillary sinus, the ethmodial sinuses, and the spheniodal sinus.
SA node (Sinus Node)
Renal Sinus
This is called sinus arrhythmia. It is a normal phenomenon where the heart rate increases during inhalation and decreases during exhalation. It is more commonly seen in younger individuals and can be a normal finding.
The large cavity within the maxillary bone is called the maxillary sinus. It is an air-filled space located above the back teeth in the upper jaw. The maxillary sinus plays a role in respiration and the production of mucus.
maxilla is the bone in the skull formed by the fusion of two bones called maxillae, when this maxilla articulates with the other bones in the skull , a space is created called the maxillary sinus , these are two in number one on each side left and right. there are other sinuses present in skull also like ethmoid sinus, sphenoid sinus, etc.