Table 1.

Mean Volumes of Major Neuropil

Neuropil	Mean (N = 16)1	SD	Relative SD (%)	Asymmetry Raw volume		Sexual dimorphism
						Raw volume		% volume
				t15 2	P	t14	P	t14	P
Lamina	2.31 × 107	5.70 × 106	24.70	0.31	0.766	−3.82	0.003	−1.72	0.114
Medulla	6.96 × 107	1.47 × 107	21.11	0.02	0.985	−2.07	0.057	−1.11	0.288
Accessory medulla	6.88 × 104	1.43 × 104	20.71	0.32	0.754	0.43	0.676	2.79	0.015
Inner lobula	8.07 × 106	1.30 × 106	16.06	0.12	0.905	−0.73	0.478	1.27	0.229
Lobula plate	5.27 × 106	1.33 × 106	25.31	0.33	0.749	−0.58	0.573	0.26	0.803
Antennal lobes	8.54 × 106	1.92 × 106	22.45	1.48	0.159	−0.54	0.601	0.98	0.343
AOTu	1.01 × 106	2.90 × 105	28.66	0.52	0.613	−2.52	0.025	−2.71	0.018
MB calyx	2.40 × 106	6.37 × 105	26.55	0.20	0.843	−1.14	0.273	−0.27	0.795
MB peduncle	2.29 × 105	7.34 × 104	32.10	0.73	0.476	−1.16	0.265	−0.07	0.945
MB lobes	1.33 × 106	3.79 × 105	28.54	0.14	0.888	−0.57	0.58	0.56	0.585
Central body lower	1.78 × 105	5.71 × 104	32.04	—	—	−1.03	0.32	0.30	0.774
Central body upper	6.32 × 105	1.64 × 105	25.94	—	—	−0.76	0.457	−0.06	0.95
Noduli	1.89 × 104	9.22 × 103	48.80	0.80	0.439	−0.79	0.46	−0.48	0.649
Protocerebral bridge	9.79 × 104	2.51 × 104	25.63	0.56	0.584	−0.19	0.849	0.65	0.527
POTu	2.00 × 104	7.57 × 103	37.93	1.21	0.245	1.24	0.248	1.92	0.077
Total mid brain	8.30 × 107	1.90 × 107	22.91	—	—	−1.89	0.079	—	—

¹For paired structures the mean is calculated from the combined volume of left and right neuropil

²Lower sample sizes for the lamina due to damage caused when removing the retina, and lack of clear boundaries for the noduli reduced the sample size to 12 (t₁₁) in both cases