The internal sinus, often referred to in a medical context, typically pertains to the internal venous sinuses located within the brain, such as the superior sagittal sinus, which drains blood from the brain. These sinuses are channels that collect deoxygenated blood and cerebrospinal fluid, playing a crucial role in the brain's venous drainage system. They are lined by endothelial cells and are essential for maintaining intracranial pressure and overall brain health. In certain contexts, the term may also relate to anatomical cavities or spaces within various organs.
The internal jugular vein is formed from the sigmoid sinus (after receiving the lesser petrosal sinus) just after passing through the jugular foramen to become the internal jugular vein.
The Internal Jugular drains the brain via the collection of blood from the superior sagittal sinus, inferior sagittal sinus, straight sinus, right transverse sinus, sigmoid sinus, and cavernous sinus (to name a few).....The other jugular....The External Jugular drains the occipital, facial (also drained by internal jugular), maxillary, and temporal veins.
SA node (Sinus Node)
SA node (Sinus Node)
through lateral wall where optic canal and internal carotid artery are
paranasal sinus include frontal sinus, the maxillary sinus, the ethmodial sinuses, and the spheniodal sinus.
A fistula is an abnormal pathway between 2 anatomic spaces or a pathway that leads from an internal cavity or organ to the surface of the body. A sinus tract is an abnormal channel that originates or ends in one opening.
The superior sagittal sinus is an area above/behind the brain, which allows blood veins to span the area, from the top of the head towards the back. It is believed that the CSF drains through the arachnoid villi into the dural venous sinuses of the superior sagittal sinus. The CSF then drains into the internal jugular veins.
The maxillary sinus
paranasal sinus include frontal sinus, the maxillary sinus, the ethmodial sinuses, and the spheniodal sinus.
Some words with the root sinus include sinusitis (inflammation of the sinuses), sinusoid (having a sinus-like curve), and sinusoidal (relating to a sinus).
In health, be sure you are talking about the correct "sinus" The heart has a sinus, so please be specific about which sinus you are referring to.