posterior nasal spine posterior nasal spine the posterior nasal spine is part of the horizontal plate of the palatine bone of the skull. it is found at the medial end of its posterior border. it is paired with the corresponding palatine bone to form a solid spine. it is the attachment of the uvula muscle. posterior nasal spineleft palatine bone. posterior aspect. enlarged. (posterior nasal spine labeled at bottom right.)roof, floor, and lateral wall of left nasal cavity. (posterior nasal spine labeled at bottom left.)detailspart ofmedial end of posterior border of horizontal plate of palatine bone of skullsystemskeletalidentifierslatinspina nasalis posterior ossis palatinita98a02.1.13.017ta2815fma75776anatomical terms of bone structure the posterior nasal spine is found at the medial end of the posterior border of the horizontal plate of the palatine bone of the skull. function the posterior nasal spine is the attachment of the uvula muscle. clinical applications the posterior nasal spine is an important cephalometric landmark. additional images base of skull. inferior surface.