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
The scientific study of fossils is called Paleontology.   The science you speak of is generally referred to as Paleontology- literally the study of old bones, as it is conâ¦cerned with fossils. If one is dealing with Human fossils- such as Neanderthal relics, one might consult fossil anthropologists- such as the late Dr. Leakey.