| 释义 |
Sheath of Schwann
| (Anat.) | See Schwann's sheath. |
See also: Sheath EncyclopediaSeeshearssheath of Schwann
sheath [shēth] a tubular case or envelope.arachnoid sheath the delicate membrane between the pial sheath and the dural sheath of the optic nerve.carotid sheath a portion of the cervical fascia enclosing the carotid artery, internal jugular vein, vagus nerve, and sympathetic nerves supplying the head.connective tissue sheath of Key and Retzius endoneurium.crural sheath femoral sheath.dural sheath the external investment of the optic nerve.femoral sheath the fascial sheath of the femoral vessels.Henle's sheath endoneurium.lamellar sheath the perineurium.medullary sheath myelin sheath.myelin sheath (nerve sheath) the sheath surrounding the axon of myelinated nerve cells, consisting of concentric layers of myelin formed in the peripheral nervous system by the plasma membrane of Schwann cells, and in the central nervous system by the plasma membrane of oligodendrocytes. It is interrupted at intervals along the length of the axon by gaps known as nodes of Ranvier. Myelin is an electrical insulator that serves to speed the conduction of nerve impulses (see conduction" >saltatory conduction).pial sheath the innermost of the three sheaths of the optic nerve.root sheath the epidermic layer of a hair follicle.sheath of Schwann neurilemma.synovial sheath synovial membrane lining the cavity of a bone through which a tendon moves.tendon sheath a lubricated fibrous or synovial layer of tissue in which the tendon is housed and through which it moves.neu·ri·lem·ma (nū'ri-lem'ă), Despite etymologic arguments in favor of the alternative spellings neurilema and neurolemma, by far the most usual spelling is neurilemma.A Schwann cell that enfolds one or more axons of the peripheral nervous system; in myelinated fibers, its plasma membrane forms the lamellae of myelin. Synonym(s): neurolemma, sheath of Schwann [neuri + G. lemma, husk] neu·ri·lem·ma (nūr'i-lem'ă) A cell that enfolds one or more axons of the peripheral nervous system; in myelinated fibers its plasma membrane forms the lamellae of myelin.
Synonym(s): neurolemma, sheath of Schwann. [neuri- + G. lemma, husk]Schwann, Theodor, German histologist and physiologist, 1810-1882. Schwann cell unit - a single Schwann cell and all of the axons lying in troughs indenting its surface.Schwann cells - cells of ectodermal (neural crest) origin that compose a continuous envelope around each nerve fiber of peripheral nerves. Synonym(s): neurilemma cellsSchwann tumorSchwann white substance - the lipid material present in the myelin sheath of nerve fibers; the medulla of bones and other organs.schwannoma - Synonym(s): neurilemoma; neuroschwannomasheath of Schwann - a cell that enfolds one or more axons of the peripheral nervous system. Synonym(s): neurilemmaneu·ri·lem·ma (nūr'i-lem'ă) A cell that enfolds axons of the peripheral nervous system.
Synonym(s): sheath of Schwann. [neuri- + G. lemma, husk]ThesaurusSeesheath |