Detail of a Malpighian corpuscle observed with the objective of 40x.  In the corpuscle we can see the central artery, surrounded by the germinal center and containing many lymphocytes, and a transition marginal zone (the red pulp is located on the left of this zone), containing fewer lymphocytes. Part of the red pulp can be observed externally. Details of the central part of the corpuscle are offered at higher magnification in other microphotography (zone framed in red)