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A sinus is a sac or cavity in any organ or tissue, or an abnormal cavity or passage. In common usage, "sinus" usually refers to the paranasal sinuses, which are air cavities in the cranial bones, especially those near the nose and connecting to it. Most individuals have four paired cavities located in the cranial bone or skull.
The paranasal sinuses are joined to the nasal cavity via small orifices called ostia. These become blocked easily by allergic inflammation, or by swelling in the nasal lining that occurs with a cold. If this happens, normal drainage of mucus within the sinuses is disrupted, and sinusitis may occur. Because the maxillary posterior teeth are ...
The sphenoid sinus is a paired paranasal sinus in the body of the sphenoid bone. It is one pair of the four paired paranasal sinuses. [1] The two sphenoid sinuses are separated from each other by a septum. Each sphenoid sinus communicates with the nasal cavity via the opening of sphenoidal sinus. [2]: 500 The two sphenoid sinuses vary in size ...
The Type III forehead is the most common situation and occurs in more than 90% of patients. The forehead, in this situation, has a prominent bossing across the top of the brows, and that bossing is overly projected. A frontal sinus is present. The thinness of the sinus precludes using exclusively rotary instruments to thin the bone.
The human nose is the first organ of the respiratory system.It is also the principal organ in the olfactory system.The shape of the nose is determined by the nasal bones and the nasal cartilages, including the nasal septum, which separates the nostrils and divides the nasal cavity into two.
Sinus (anatomy), a sac or cavity in any organ or tissue Paranasal sinuses, air cavities in the cranial bones, especially those near the nose, including: Maxillary sinus, is the largest of the paranasal sinuses, under the eyes, in the maxillary bones; Frontal sinus, superior to the eyes, in the frontal bone, which forms the hard part of the forehead
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The orbital plate and that part of the sphenoid, which is found in the temporal fossa, as well as the lateral pterygoid plate, are ossified in membrane (Fawcett). Soon after, the centers for the postsphenoid part of the body appear, one on either side of the sella turcica, and become blended together about the middle of fetal life.