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. Author manuscript; available in PMC: 2018 Dec 1.
Published in final edited form as: Hear Res. 2017 Nov 1;356:35–50. doi: 10.1016/j.heares.2017.10.015

Figure 1.

Figure 1

Measurements of head and pinna dimensions in the developing guinea pig. A: Head diameter was measured as the widest part of the skull (between points AB; see inset) as well as from P0 through P165 in 50 animals. Measurements between the ear canals were also taken (interaural distance; A’B’). B: Effective pinna diameter was calculated by measuring pinna height (CD) and pinna width (EF; see inset for equation) in 20 animals. Data points in A and B indicate single animal measurements. The dashed line and gray area indicate the mean and associated standard deviation, respectively, for the adult animal population (>P70; data points compiled on far right). Dimensions of the head and pinna increased by factors of 2.4 and 1.56, respectively, reaching adult values by ~8 weeks (P56).