Table 3. Glia density by cortex layer.

Brain Area	Cell Layer	Neuroglia
		I	II	IIIA	IIIB	V	VI	Area Mean
	Delphinus delphis (Brain: 783g)
APL		48,944	36,733	39,215	47,852	47,852	48,149	44,791
SLL		40,902	37,130	33,357	36,633	41,796	40,009	38,305
Layer Mean		44,923	36,932	36,286	42,243	44,824	44,079	41,548
	Tursiops truncatus (Brain: 1,559g)
APL		26,859	32,274	30,108	36,390	28,808	36,173	31,769
SLL		32,991	29,875	32,807	34,274	41,422	36,473	34,640
Layer Mean		29,925	31,075	31,458	35,332	35,115	36,323	33,205
	Ziphius cavirostris (Brain: 2,004g)
APL		35,144	32,166	36,931	29,783	43,483	47,057	37,427
SLL		28,592	22,040	35,144	44,079	33,357	42,292	34,251
Layer Mean		31,868	27,103	36,038	36,931	38,420	44,675	35,839
	Orcinus orca (Brain: 6,215g)
APL		29,188	29,485	25,018	21,146	22,933	22,933	25,117
SLL		34,846	26,507	27,401	28,592	30,677	29,783	29,634
Layer Mean		32,017	27,996	26,210	24,869	26,805	26,358	27,376

Glial cell packing density ranges for four species of odontocetes by cell layer and brain area. APL = anterior paralimbic lobule; SLL = supralimbic lobule. All values represent average glial cell counts.