mesaxonn.

Brit.

/mɛzˈaksɒn/,

/mɛsˈaksɒn/, U.S.

/mɛsˈæksɑn/; see also meso- comb. form

Origin: Formed within English, by compounding. Etymons: meso- comb. form, axon n.

Etymology: < meso- comb. form + axon n. (compare sense 2 at that entry); so named because the double layer of plasma membrane resembles a mesentery in electron micrographs.

Anatomy.

The covering of an axon formed by invagination of the plasma membrane of a Schwann cell or oligodendrocyte.

ΘΚΠ

the world > life > the body > nervous system > nerve > parts of nerves > [noun] > other membranes

Henle's sheath1853

rectifier1895

mesaxon1955

1955 H. S. Gasser in Jrnl. Gen. Physiol. 38 713 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.

1961 Lancet 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.

1970 J. Pick Autonomic Nerv. Syst. 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.

1985 C. R. Leeson et al. Textbk. Histol. (ed. 5) 222/2 In unmyelinated fibers, the nerve fibers lie singly or in groups in longitudinal gutters or invaginations of Schwann cells with the original line of invagination being the mesaxon.

This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).

单词	mesaxon
释义	mesaxonn. Brit. /mɛzˈaksɒn/, /mɛsˈaksɒn/, U.S. /mɛsˈæksɑn/; see also meso- comb. form Origin: Formed within English, by compounding. Etymons: meso- comb. form, axon n. Etymology: < meso- comb. form + axon n. (compare sense 2 at that entry); so named because the double layer of plasma membrane resembles a mesentery in electron micrographs. Anatomy. The covering of an axon formed by invagination of the plasma membrane of a Schwann cell or oligodendrocyte. ΘΚΠ the world > life > the body > nervous system > nerve > parts of nerves > [noun] > other membranes Henle's sheath1853 rectifier1895 mesaxon1955 1955 H. S. Gasser in Jrnl. Gen. Physiol. 38 713 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. 1961 Lancet 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. 1970 J. Pick Autonomic Nerv. Syst. 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. 1985 C. R. Leeson et al. Textbk. Histol. (ed. 5) 222/2 In unmyelinated fibers, the nerve fibers lie singly or in groups in longitudinal gutters or invaginations of Schwann cells with the original line of invagination being the mesaxon. This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022). < n.1955
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