Two types of dendrites present on pyramidal cells are apical and basal dendrites. An apical dendrite is a dendrite that emerges from the apex of a pyramidal cell. LTD affects hippocampal synapses between the Schaffer collaterals and the CA1 pyramidal cells. The apical dendrite rises from the apex of the pyramidal cell's soma. Tubercles can be conical, cylindrical, pyramidal or round. The pyramidal and stellate neurons express SATB2 and CUX1. Dendritic spines receive most of the excitatory impulses (EPSPs) that enter a pyramidal cell. The extent of back-propagation of action potentials within pyramidal dendrites depends upon the K channels. The flowers are in loose cymes in oblong or pyramidal panicles. These mechanisms are particular to networks of pyramidal neurons. Kandel took on the task of performing electrophysiological recordings from hippocampal pyramidal neurons. The copper-binding site is described as distorted trigonal pyramidal. The trihalides , , , and are all molecular compounds having trigonal pyramidal molecular geometry. It is responsible for the difference between regular spiking and intrinsically bursting pyramidal neurons. Layer II is densely packed with pyramidal and semilunar cells.