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
1
+
-
2
++
3
4
5
6
7
8
9
10
11
12