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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