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Table 1 Presence and number of visible entrances from nasal cavity to rostral and caudal maxillary sinus (N = 12)

From: Volumetric measurements of paranasal sinuses and examination of sinonasal communication in healthy Shetland ponies: anatomical and morphometric characteristics using computed tomography

Pony number Rostral nasomaxillary aperture Caudal nasomaxillary aperture
left right left right
1 + - - -
2 + ++ - -
3 - - + +
4 + + - +
5 - - - -
6 + ++ + -
7 + + + +
8 - - - -
9 + - - -
10 ++ ++ - -
11 - - - -
12 + - + -
  1. - no entrance, + one entrance, ++ split entrance