The image is of a section of the cerebellum, an organ that belongs to the central nervous system, located inside the skull under the brain.
In addition to several smaller neurons, observe three large neurons of a type called Purkinje cells.
Observe attentively each Purkinje cell. Look for their nuclei and nucleoli.
Place the cursor or click on the image:
Purkinje cells 1 and 3 – have imprecise nuclei and no obvious nucleoli.
Purkinje cell 2 – has an evident nucleus and nucleolus.
Cells “lacking” nuclei, or nuclei without nucleoli are often seen in sections of the cerebellum, as well as in sections of most other organs.
Why do cells show such varied appearances? See the explanation on the next page.
Cerebellum. Hematoxylin and eosin. Medium magnification.