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
1 Botany is the study of plants. 2  Dendrology is the study of trees. 3  Dendrology is the branch of botany that is concerned with the natural history of trees and shrubs. 4  Silvics is the the scientific study of trees and their environment.