. On the anatomy of vertebrates [electronic resource] . The inner wall of the tympanum, xcvii. (liiamosal and tympanic bone with themembrane. Human foetus, xcvii. are brought into relation with those of the membrane closing theouter auditory opening by the chain of ossicles called f i membrana tympani is fixed in a groove of a bony framewhich is so far ossified as to form an incomplete ring, at the thirdmonth of human foetal life ; at the sixth month it begins to coa-lesce with the squamosal, fig. 185, and then to grow outward,forming the wall of the bottom of the auditory meatus
. On the anatomy of vertebrates [electronic resource] . The inner wall of the tympanum, xcvii. (liiamosal and tympanic bone with themembrane. Human foetus, xcvii. are brought into relation with those of the membrane closing theouter auditory opening by the chain of ossicles called f i membrana tympani is fixed in a groove of a bony framewhich is so far ossified as to form an incomplete ring, at the thirdmonth of human foetal life ; at the sixth month it begins to coa-lesce with the squamosal, fig. 185, and then to grow outward,forming the wall of the bottom of the auditory meatus, fig. 188, g,the lower part of which is the last to be completed. The drum,fig. 186, consists of a £ proper membrane, with an inner layer 240 ANATOMY OF VERTEBRATES. contributed by the lining of the tympanum, and an outer layer bythat of the auditory passage. The proper membrane, moreover, is divisible into two layers, an outer oneconsisting of fibres radiating from nearthe centre, and an inner, thicker, lessdistinctly fibrous layer, but indicativeo
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