How can I specifically know the hippocampus over the microscope in the coronal section of the whole brain slice. What have peculiar feature from other brain areas?
You project notes say that you are working in mouse brain, so you should consult a mouse brain atlas to find what the hippocampus looks like at the particular coordinates of your coronal section. For instance, the Allen Mouse Brain atlas can be accessed here:
http://mouse.brain-map.org/static/atlas
The Harvard High Resolution Mouse Brain Atlas is here:
For this atlas, please note that you must click on the "labels" arrow in the bottom right hand side of the image to identify the different brain structures.