Structure
The perirhinal cortex is composed of two regions: areas 36 and 35. Area 36 is sometimes divided into three subdivisions: 36d is the most rostral and dorsal, 36r ventral and caudal, and 36c the most caudal. Area 35 can be divided in the same manner, into 35d and 35v (for dorsal and ventral, respectively).
Area 36 is six-layered, dysgranular cortex, meaning that its layer IV is relatively sparse. Area 35 is agranular (lacking any cells in layer IV).
Read more about this topic: Perirhinal Cortex
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