| membranous wall of trachea | The part of the tracheal wall posteriorly that is not reinforced by tracheal cartilages. Synonym: paries membranaceus tracheae. (05 Mar 2000) |
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| common limb of membranous saemicircular ducts | The united, nonampullary ends of the superior and posterior saemicircular ducts. Synonym: crus membranaceum commune ductus saemicircularis, common limb of membranous saemicircular ducts. (05 Mar 2000) |
| simple membranous limb of saemicircular duct | The non-ampullary end of the lateral saemicircular duct that opens independently into the utricle. Synonym: crus membranaceum simplex ductus saemicircularis, simple membranous limb of saemicircular duct. (05 Mar 2000) |