Term: spiny neuron with chandelier-like axon

Definition: This cell type, usually found throughout the core of the Ov, is separately classified from other spiny neurons for its oval or triangular soma and, above all, ubiquitous axonal features. The soma measures from 17 to 22 micrometers in the longest axis, and it gives rise to two or three thick primary dendrites devoid of spines. Primary dendrites are relatively short (20 to 70 micrometers), providing long secondary (120 to 200 micrometers) and occasionally tertiary, terminal dendrites. An abundance of dendritic spines is a prominent feature of secondary and tertiary dendrites. The dendritic field is roughly ovoid; it measures 150 to 300 micrometers and remains within the confines of the core. The axon stems from the soma or from the root of a primary dendrite, following an arched trajectory for 100 to 300 micrometers. Then, the axon gives rise to two to six long collaterals, which display small varicosities. A unique feature of SCA axons is the presence of short, straight collaterals issuing transverse drumstick terminals. These collaterals consist of rows of large, rounded swellings connected by very thin (0.2 micrometers) axoplasmic bridges, i.e., candles.