Table 1.

Mean SAS area (nm² ± SEM), number of synaptic SAS analyzed (n), and the location (µ), and scale (σ) of the best-fit log-normal distributions in the six cortical layers

	AS				SS
	Mean SAS area ± SEM (nm2)	n	μ	σ	Mean SAS area ± SEM (nm2)	n	μ	σ
Layer I	70,834.87 ± 2649.41	594	10.81	0.88	104,309.94 ± 8741.68	77	11.29	0.78
Layer II	58,987.37 ± 1788.36	992	10.72	0.83	87,757.53 ± 8875.47	64	11.14	0.72
Layer III	72,729.58 ± 1209.78	2212	10.93	0.74	116,703.42 ± 6735.43	185	11.42	0.72
Layer IV	54,770.81 ± 1245.29	1200	10.65	0.73	68,355.35 ± 3896.95	172	10.88	0.73
Layer V	69,682.16 ± 2210.41	684	10.85	0.81	113,353.40 ± 10086.08	62	11.41	0.69
Layer VI	58,668.28 ± 2050.82	577	10.73	0.70	69,382.12 ± 5695.64	72	10.90	0.76
Layers I–VI	65,299.31 ± 697.16	6259	10.84	0.79	93,384.53 ± 3001.23	632	11.17	0.78

Unweighted means for Layers I–VI are also given.