Axolemm
The axolemma or axolemma (of Alt Gr. Ἄξων axon 'axis' and εἴλημα Eilema 'cloth'), rare Mauthnersche sheath called, is the continuation of the cell membrane in the region of axon extension of said nerve cells.
The axolemm, the biomembrane surrounding the axoplasm , is basically structured in a similar way to the rest of the cell membrane of a nerve cell. Specific membrane regions along the axon are usually found in the initial segment as the initial segment , where action potentials are initiated, and in the final segment as the axon terminal , where a presynaptic end is usually designed as an end button, for example.
In the middle course of the nerve cell membrane route showing in axons, a myelin sheath wear, a change from the internode to Node of Ranvier alternating structure due to the specific nature of the transmission of action potentials . A nodal axolemma is distinguished in the area of Ranvier's nodes , which is characterized by its dense population of sodium channels (which are necessary here for the saltatory conduction of excitation ). In the internodal axolemma these canals are only sparsely found.
Individual evidence
- ↑ Axolemma. Definition. In: Lexicon of Biology. at Wissenschaft-online.de
- ^ Luiz Carlos Junqueira (author), José Carneiro (author), Manfred Gratzl (ed.): Histologie: Neue Approbationsordnung. 6th, new trans. revised Edition. Springer, Berlin 2004, ISBN 3-540-21965-X , p. 112.
- ^ Theodor H. Schiebler, Horst-W. Korf: Anatomy: histology, history of development, macroscopic and microscopic anatomy, topography. 10., completely revised. Steinkopff, 2007, ISBN 978-3-7985-1770-7 , p. 72.
- ↑ Renate Lüllmann-Rauch: Histology . 3rd, completely revised edition. Thieme, Stuttgart 2009, ISBN 978-3-13-129243-8 , p. 186.
- ^ Luiz Carlos Junqueira (author), José Carneiro (author), Manfred Gratzl (ed.): Histologie: Neue Approbationsordnung. 6th, new trans. revised Edition. Springer, Berlin 2004, ISBN 3-540-21965-X , p. 120.