Stratum lucidum of hippocampus

In hippocampus anatomy, the stratum pyramidale is one of seven layers, or stratums, that make up the entire neural structure. The stratum pyramidale is the third deepest hippocampal layer, and in relation to the stratum lucidum, is located underneath it. The stratum pyramidale houses cell bodies of the pyramidal neurons, which are the foundational excitatory neurons of the hippocampus. In the CA3 region of the hippocampus, the stratum pyramidale connects with the stratum lucidum by mossy fibers[2] that run through both subfields.

The layer above the stratum lucidum.

The types of neurons found in the stratum lucidum are called interneurons,[3] neurons which form a connection between other neurons in a different location. This situation is described in the mossy fiber axon connection in the CA3 stratum lucidum region of the hippocampus as is in relation to Purkinje cells. The interneurons found in the stratum lucidum are of two classes, spiny and aspiny. Spiny neurons are a "special type of inhibitory cell", characterized by spiny projections on the dendrites of the cell. The axons of these neurons in the hippocampus terminate primarily in the stratum lucidum and stratum radiatum of CA3. Spiny neurons are of importance because of their "pivotal role in motor control, habit formation, and motivated behavior". They receive synaptic inputs from mossy fibers boutons, as well as multiple other synaptic terminals. The majority of axon collaterals of these neurons remain in the stratum lucidum and CA3 region, though in some cases axon collaterals of these neurons are observed migrating into the CA1 region of the hippocampus. Aspiny neurons, the second class of neurons found in the stratum lucidum, are another type of inhibitory cell similar to spiny neurons, though lacking dendrite projections. They make up the majority of the neuron composition in comparison to spiny neurons, about 63 percent. The somata of aspiny neurons are for the most part bipolar, generating 2–5 primary dendrites "that to a varying extent displayed varicose swellings in their course". Similar to spiny neurons, aspiny neuron dendrites "branch extensively in stratum lucidum and stratum radiatum of CA3", in contrast to spiny neurons, however, some dendrites "traversed stratum pyramidale and entered stratum oriens", the second deepest layer of the hippocampus. Additionally, what distinguishes aspiny neurons form spiny neurons is their higher maximal firing rates and narrower action potential half-widths than their spiny counterparts.