Fig. 7
From: A self-adjusting head holder without ear-bars for guinea pigs
Triangular fixation of the guinea pig skull by the head holder in sagittal plane. 1 Snoutpiece; 2 mouthpiece; 3 neck of the incisors; 4 dorsal surface of the snout (nasal bones); 5 maxillary premolars; 6 zygomatic arch; 7 entrance to the external acoustic meatus. The vertices of the triangle indicate the places of head fixation to the head holder. Scale bar = 10 mm