Biomaterial Database

Schmidt-Lanterman incisures. II. A light and electron microscope study of remyelinating peripheral nerve fibres. 1980

M N Ghabriel, and G Allt

A mechanism has been proposed previously for the formation of Schmidt-Lanterman incisures during ontogeny as myelinated nerve fibres increase in diameter. In this study, the mode of formation of incisures and their development were examined by light and electron microscopy in remyelinating fibres (16-200 d) of the sural nerve of rats following lysophosphatidyl choline (LPC)-induced segmental demyelination. In remyelination, a basic number of incisures is incorporated into the myelin sheath ab initio. Apparently these incisures which are at first circumferentially incomplete, being localised to the region of the mesaxons, progressively extend around the whole circumference of the myelin sheath. As fibre diameter increases, additional incisures are added, seemingly, by the intrusion of Schwann cell cytoplasm between the compact myelin lamellae, from the abaxonal side of the myelin sheath. The progressive differentiation of incisures is described in terms of their complement of organelles. The results are discussed with reference to the possible functions of incisures.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008854	Microscopy, Electron	Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.	Electron Microscopy
D009186	Myelin Sheath	The lipid-rich sheath surrounding AXONS in both the CENTRAL NERVOUS SYSTEMS and PERIPHERAL NERVOUS SYSTEM. The myelin sheath is an electrical insulator and allows faster and more energetically efficient conduction of impulses. The sheath is formed by the cell membranes of glial cells (SCHWANN CELLS in the peripheral and OLIGODENDROGLIA in the central nervous system). Deterioration of the sheath in DEMYELINATING DISEASES is a serious clinical problem.	Myelin,Myelin Sheaths,Sheath, Myelin,Sheaths, Myelin
D009413	Nerve Fibers, Myelinated	A class of nerve fibers as defined by their structure, specifically the nerve sheath arrangement. The AXONS of the myelinated nerve fibers are completely encased in a MYELIN SHEATH. They are fibers of relatively large and varied diameters. Their NEURAL CONDUCTION rates are faster than those of the unmyelinated nerve fibers (NERVE FIBERS, UNMYELINATED). Myelinated nerve fibers are present in somatic and autonomic nerves.	A Fibers,B Fibers,Fiber, Myelinated Nerve,Fibers, Myelinated Nerve,Myelinated Nerve Fiber,Myelinated Nerve Fibers,Nerve Fiber, Myelinated
D002454	Cell Differentiation	Progressive restriction of the developmental potential and increasing specialization of function that leads to the formation of specialized cells, tissues, and organs.	Differentiation, Cell,Cell Differentiations,Differentiations, Cell
D005260	Female		Females
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D012583	Schwann Cells	Neuroglial cells of the peripheral nervous system which form the insulating myelin sheaths of peripheral axons.	Schwann Cell,Cell, Schwann,Cells, Schwann
D013497	Sural Nerve	A branch of the tibial nerve which supplies sensory innervation to parts of the lower leg and foot.	Nerve, Sural,Nerves, Sural,Sural Nerves
D051381	Rats	The common name for the genus Rattus.	Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus