Below the bulla ethmoidalis and hidden by the uncinate process of the ethmoid is the opening of the maxillary sinus ( ostium maxillare ); an accessory opening is frequently present above the posterior part of the inferior nasal concha.
22.
The surgical procedures include the operation of diseased ethmoid compartments ( usually ethmoidal bulla ), widening of stenotic clefts ( uncinate process ) and freeing of prechambers ( agar nasi cells ) to the frontal and maxillary sinuses from disease.
23.
There is a hook-shaped "'uncinate process "'on the side edges of the top surface of the bodies of the third to the seventh cervical vertebrae, and also of the first thoracic vertebra.
24.
A curved lamina, the uncinate process, projects downward and backward from this part of the labyrinth; it forms a small part of the medial wall of the maxillary sinus, and articulates with the ethmoidal process of the inferior nasal concha.
25.
The superior mesenteric artery passes down in front of the left half across the uncinate process; the superior mesenteric vein runs upward on the right side of the artery and, behind the neck, joins with the lienal vein to form the portal vein.
26.
On it is a curved fissure, the hiatus semilunaris, limited below by the edge of the uncinate process of the ethmoid and above by an elevation named the bulla ethmoidalis; the middle ethmoidal cells are contained within this bulla and open on or near to it.
27.
Behind the lacrimal process of the inferior nasal conchae lies a broad, thin plate, the "'ethmoidal process "', which ascends to join the uncinate process of the ethmoid; from its lower border a thin lamina, the maxillary process, curves downward and lateralward; it articulates with the maxilla and forms a part of the medial wall of the maxillary sinus.
28.
The "'uncinate processes of the ribs "'are extensions of bone that project caudally from the vertical segment of each rib . ( Uncinate means " hooked " from Latin " uncinatus ", from " uncinus ", barb, from " uncus ", hook . ) They are found in birds ( except for screamers ), reptiles, and the early amphibian Ichthyostega.
