Further in front runs an oblique ridge, the conchal crest which articulates with the inferior nasal concha.
2.
In front of the opening of the sinus is a deep lacrimal groove which the lacrimal bone and inferior nasal concha convert into the nasolacrimal canal, which transmits the nasolacrimal duct.
3.
It is bounded inferiorly and anteriorly by the sharp concave margin of the uncinate process of the ethmoid bone, superiorly by the ethmoidal bulla, and posteriorly by the inferior nasal concha.
4.
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.
5.
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.
6.
While in the pterygopalatine canal, it gives off lateral posterior inferior nasal branches which enter the nasal cavity through openings in the palatine bone, and ramify over the inferior nasal concha and middle and inferior meatuses; at its exit from the canal, a palatine branch is distributed to both surfaces of the soft palate.
7.
Immediately above this is a well-marked horizontal ridge, the conchal crest, for articulation with the inferior nasal concha; still higher is a second broad, shallow depression, which forms part of the middle meatus, and is limited above by a horizontal crest less prominent than the inferior, the ethmoidal crest, for articulation with the middle nasal concha.
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