Onkyo's website refers to this unit as a 7.2-channel receiver. It is clear from one of your photographs, but from no text in the review, that the height speaker terminals can be used as rear surround speaker terminals instead, for a 7.1 (or 7.2) channel setup.
In many cases, the students dissect human corpses (cadavers). Microscopic anatomy, also known as histology, is the study of cells and tissues of animals, humans and plants that are too small to been seen with the naked eye.
There are three main areas of anatomy: gross anatomy deals with organs and organ groupings called systems that are visible to the naked eye; cytology is the study of cell structure; and histology examines the structure of tissues. Microscopes are used in both cytology and histology to study cell and tissue structures.