1 A thick or coarse purÃ©e of fruit or vegetables. 2  The residue of cooked or uncooked fruit or vegetables after sieving or pressing out the juice. citrus pulp is sometimes used in manufactured orange drinks.  noun material produced from recycled paper, rags or ground wood, mixed with water, used for making paper.
Myelin sheath. (Science: anatomy, neurology) An insulating layer surrounding vertebrate peripheral neurons, that dramatically increases the speed of conduction. It is formed by specialised schwann cells, that can wrap around neurons up to 50 times.
The myelin sheath is a greatly extended and modified plasma membrane wrapped around the nerve axon in a spiral fashion [ 1 ]. The myelin membranes originate from and are a part of the Schwann cells in the peripheral nervous system (PNS) and the oligodendroglial cells in the central nervous system (CNS) (see Chap. 1).Each myelin-generating cell furnishes myelin for only one segment of any given axon.wo adjacent segments of myelin on one axon are separated by a node of Ranvier. In this region, the axon is not covered by myelin. At the paranodal region and the Schmidt-Lantermann clefts, the cytoplasmic surfaces of myelin are not compacted and Schwann or glial cell cytoplasm is included within the sheath.