The subarachanoid space lies between the arachnoid and pia mater. It is filled with cerebrospinal fluid. All blood vessels entering the brain, as well as cranial nerves pass through this space. The term arachnoid refers to the spider web like appearance of the blood vessels within the space.
Why do biologists organize living things into groups? What do the levels of classification indicate about the relationship between organisms? What characteristics are used to classify organisms into domains and kingdoms? What is the scientific study of how living things are classified called? Taxonomy
Taxonomy is the study of the principles of scientific classification. In this page we will learn how insects are classified. First we will see where insects belong in the animal kingdom. Then we will find out how the different insects are sorted in groups. Use the Glossary to look up some of the technical words or terms.