| 释义 |
mesaxon Anat.|mɛˈsæksɒn|
[f. mesentery (see quot. 1955) + axon.]
In a nerve fibre, a structure composed of a pair of parallel membranes contiguous with the plasma membrane of the Schwann cell, forming in an unmyelinated fibre a channel leading from the outside of the cell to the axon it surrounds and in a myelinated fibre a spiral round the axon that constitutes the myelin sheath.
1955H. S. Gasser in Jrnl. Gen. Physiol. XXXVIII. 713 The membrane sharply visible on the outside of the Schwann tubes may be taken as the starting point. To this membrane..the axons are in continuous attachment. On account of the analogy with the mesentery the attachments have been designated mesaxons. 1961Lancet 16 Sept. 656/1 H. F. de Webster..in a study on the demyelination which occurs in experimental diphtheritic neuritis found that the earliest changes amount to focal fragmentation of the mesaxons. 1970J. Pick Autonomic Nervous System v. 127/1 According to Gasser.., an unmyelinated nerve fiber usually consists of several axons which are placed in the infoldings of their Schwann cell. The plasma membrane of this sheath cell doubles up and together with the intervening channel forms the mesaxon. Upon reaching the axon, the membranes of the mesaxon separate and surround the axolemma. |