Table 2.

Morphological properties of sampled cortical pyramidal neurons

	Pyramidal neuron group
	L2/3 (n = 5)	L4 (n = 5)	L5a (n = 3)	L5b (n = 5)	L6 + (n = 5)	L6− (n = 5)
Soma area (μm²)	98.7 ± 8.0	84.0 ± 9.6	190.0 ± 84.1^*^{,^††}	243.8 ± 70.8^**^{,^†††}	95.5 ± 23.4^{^‡‡,^§§§}	100.5 ± 7.7^{^‡,^§§§}
Horizontal span of apical dendrite (μm)^{^a}	416.6 ± 64.2	138.5 ± 49.1^***	111.4 ± 30.0^***	432.4 ± 98.5^{^†††,^‡‡‡}	172.8 ± 37.2^***^{,^§§§}	206.2 ± 83.7^***^{,^§§§}
Height of apical shaft (μm)^{^a}	305.0 ± 70.8	362.1 ± 121.3	748.0 ± 74.4^***^{,^†††}	944.8 ± 91.4^***^{,^†††, ^‡}	708.8 ± 81.9^***^{,^†††,^§§§}	408.7 ± 84.8^{^‡‡‡,^§§§,^¶¶¶}
Horizontal span of basal dendrite (μm)^a	274.8 ± 42.6	227.7 ± 19.7	361.2 ± 27.7^{^††}	420.6 ± 85.0^***^{,^†††}	214.0 ± 34.5^{^‡‡‡,^§§§}	314.7 ± 44.8^{^†,^§§,^¶¶}
Total length of axon collaterals (mm)^{^b}	26.92 ± 7.39	25.07 ± 11.45	29.5 ± 6.3	12.5 ± 2.92^*^{,^‡}	9.19 ± 3.38^**^{,^†,^‡‡}	26.11 ± 11.24^{^§,^¶¶}
Total number of boutons (A)^{^c}	5918 ± 2282	5993 ± 3243	5408 ± 1636	1695 ± 503^**^{,^††,^‡}	1872 ± 1012^**^{,^††,^‡}	4675 ± 2704^{^§}
Bouton density (/mm)	215.5 ± 34.5	231.3 ± 35.9	181.9 ± 36.8	135.0 ± 22.5^**^{,^†††}	195.4 ± 36.0^{^§}	168.7 ± 37.6^{^†}
Number of boutons apposed to CTN dendrites(B)	167 ± 115	327 ± 164	529 ± 148	374 ± 142	612 ± 223^*	953 ± 500^***^{,^††,^§§}
B/A (%)	2.97 ± 1.88	5.89 ± 2.50	10.17 ± 2.74	21.54 ± 2.59^***^{,^††}	35.41 ± 11.76^***^{,^†††,^‡‡‡,^§}	24.75 ± 11.22^***^{,^†††,^‡,^¶}

↵*^{,†,‡,§,¶}Significant differences (*^{,†,‡,§,¶}p < 0.05; **^{,††,‡‡,§§,¶¶}p < 0.01; ***^{,†††,‡‡‡,§§§,¶¶¶}p < 0.001 by Peritz's F test) from the value of L2/3, L4, L5a, L5b, or L6+ neurons, respectively.
↵^a The horizontal span and height of dendrites were measured in the frontal plane to which all the dendrites were projected.
↵^bTotal length of axon collaterals was estimated by multiplying the total length of axon collaterals projected onto the frontal plane by π/2.
↵^cTotal number of boutons in L4–6 were counted and those in L1–3 were estimated from length of axon collaterals and bouton density in L1–3 (L2/3 neurons, 224.2 ± 39.0 /mm; L4 neurons, 269.6 ± 38.3 /mm; L5a neurons, 229.8 ± 52.7 /mm; L5b neurons, 200.5 ± 37.6 /mm).