Neurilemma - Wikipedia Neurilemma Neurilemma Diagram of longitudinal sections of medullated nerve fibers. Cross section of an axon. 1. Axon 2. Nucleus of Schwann cell 3. Schwann cell 4. Myelin sheath 5. Neurilemma Details System Peripheral nervous system Location Schwann cell Identifiers MeSH D009441 TH H2. 00.06. 1.00002 Anatomical terms of microanatomy ( edit on Wikidata ) Neurilemma ( also known as neurolemma, sheath of Schwann, or Schwann 's sheath ) is the outermost nucleated cytoplasmic layer of Schwann cells ( also called neurilemmocytes ) that surrounds the axon of the neuron. It forms the outermost layer of the nerve fiber in the peripheral nervous system. The neurilemma is underlain by the myelin sheath ( referred to as the medullary sheath in the included illustrations ). In the central nervous system, axons are myelinated by oligodendrocytes, thus lack neurilemma. The myelin sheaths of Oligodendrocytes do not have neurilemma because excess cytoplasm is directed centrally toward the oligodendrocyte cell body. Neurilemma serves a protective function for peripheral nerve fibers. Damaged nerve fibers may regenerate if the perikaryon is not damaged and the neurilemma remains intact. The neurilemma forms a regeneration tube through which the growing axon re-establishes its original connection. A neurilemoma is a tumor of the neurilemma. References ^ Jump up to : Albert, Daniel ( 2012 ). Dorland 's illustrated medical dictionary ( 32nd ed. ed. ). Philadelphia, PA : Saunders / Elsevier. pp. 1262 -- 1263. ISBN 9781416062578. CS1 maint : Extra text ( link ) Jump up ^ Elaine N. Marieb ; Katja Hoehn ( 2007 ). Human Anatomy & Physiology ( 7th Ed. ). Pearson. pp. 394 -- 5. ISBN 0 - 8053 - 5909 - 5. External links Histology at dmacc.edu Nervous tissue CNS Tissue Types Grey matter White matter Projection fibers Association fiber Commissural fiber Lemniscus Nerve tract Decussation Commissure Neuropil Meninges Cell Types Neuronal Pyramidal Purkinje Granule Glial insulating : Myelination : Oligodendrocyte other Astrocyte Radial glial cell Ependymal cells Tanycyte Microglia PNS General Dorsal Root Ganglion Ramus Ventral Root Ramus Ramus communicans Gray White Autonomic ganglion ( Preganglionic nerve fibers Postganglionic nerve fibers ) Nerve fascicle Funiculus Connective tissues Epineurium Perineurium Endoneurium Neuroglia Myelination : Schwann cell Neurilemma Myelin incisure Node of Ranvier Internodal segment Satellite glial cell Neurons / nerve fibers Parts Soma Axon hillock Axon Telodendron Axon terminals Axoplasm Axolemma Neurofibril / neurofilament Dendrite Nissl body Dendritic spine Apical dendrite / Basal dendrite Types Bipolar Unipolar Pseudounipolar Multipolar Interneuron Renshaw Afferent nerve fiber / Sensory neuron GSA GVA SSA SVA fibers Ia or Aα Ib or Golgi or Aα II or Aβ and Aγ III or Aδ or fast pain IV or C or slow pain Efferent nerve fiber / Motor neuron GSE GVE SVE Upper motor neuron Lower motor neuron α motorneuron β motorneuron γ motorneuron Termination Synapse Electrical synapse / Gap junction Chemical synapse Synaptic vesicle Active zone Postsynaptic density Autapse Ribbon synapse Neuromuscular junction Sensory receptors Meissner 's corpuscle Merkel nerve ending Pacinian corpuscle Ruffini ending Muscle spindle Free nerve ending Nociceptor Olfactory receptor neuron Photoreceptor cell Hair cell Taste bud This neuroanatomy article is a stub. You can help Wikipedia by expanding it. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Neurilemma&oldid=828405903 '' Categories : Neurohistology Neuroanatomy stubs Hidden categories : Pages with unresolved properties CS1 maint : Extra text All stub articles Talk About Wikipedia Deutsch Español Français Português Română Edit links This page was last edited on 2 March 2018, at 10 : 16 ( UTC ). About Wikipedia

Question: the neurilemma of axons in the pns is formed by
Answer: the outermost nucleated cytoplasmic layer of Schwann cells (also called neurilemmocytes)