Some of you may wonder if there is a difference between the "fascia dentata" (labeled FD below) and the "dentate gyrus" (labeled DG below). They are two different names for the same structure!
Some of the cornu ammonis (CA) subfields have special names. Sometimes CA1 is called the "Sommer sector", CA3 is called the "Spielmeyer sector", and CA4 is called the "Bratz sector"
Hello and happy #SubfieldWednesday! Today we are going to get a bit more familiar with how the hippocampal subfields differ in their composition of different cell types, cell sizes, and layer thickness. 🍤🔬
Here are some images taken from five different hippocampal subfields (CA1, CA2, CA3, dentate gyrus, and subiculum). Can you tell which number corresponds to which subfield? 🤔
Because a Nissl stain was applied to these slices, the cell bodies appear dark purple. This allows neuroanatomists to characterize the size, shape, and relative spacing of the cells.
This quiz even stumped some of us at @hipposubfields headquarters! We had to contact a neuroanatomist to confirm which answer is correct! (or at least "the most correct")
Braak and Braak (1985) originally described the transentorhinal cortex as a 'transition region between entorhinal cortex and temporal isocortex. This rules out answer A (part of ERC)
Hello subfield-fans! Last week's #SubfieldWednesday topic was the layered composition of the hippocampal subfields. We learned that the subfields contain three major cellular layers which makes them a part of the allocortex.
Even though the hippocampus sometimes gets grouped together with subcortical structures like the thalamus and basal ganglia, the dentate gyrus, CA fields, and subiculum are all part of a special type of cortex called the allocortex!
You might recall that the hippocampus is a layered structure (just like the neocortex!) and that some of the layers have different contrast properties due to different amounts of myelination and cell densities