Surgical treatment; a practical treatise on the therapy of surgical diseases for the use of practitioners and students of surgery . of the antrum. The roof of the antrum is separatedfrom the cranial cavity by a thin plate of bone which is perforated by veins emptying intothe superior petrosal sinus. It is on a level with the lower border of the posterior root ofthe zygoma. The floor of the antrum is in relation to the mastoid cells. The Fallopian canal, trans-mitting the facial nerve, lies at the inner side of the passage between the tympanum andantrum. The posterior wall of the antrum is thin
Surgical treatment; a practical treatise on the therapy of surgical diseases for the use of practitioners and students of surgery . of the antrum. The roof of the antrum is separatedfrom the cranial cavity by a thin plate of bone which is perforated by veins emptying intothe superior petrosal sinus. It is on a level with the lower border of the posterior root ofthe zygoma. The floor of the antrum is in relation to the mastoid cells. The Fallopian canal, trans-mitting the facial nerve, lies at the inner side of the passage between the tympanum andantrum. The posterior wall of the antrum is thin and perforated by veins passing to thesigmoid sinus. 300 SURGICAL TREATMENT The postmeatal triangle is bounded above by the posterior root of the zygoma, infront by the osseous part of the external auditory meatus, and behind and below by aline connecting these two. If the osseous external auditory meatus is bisected by a hori-zontal line, the upper half would be on a line with the antrum. This triangle, lying justbehind the meatus, represents the outer wall of the antrum, through which the antrumshould be opened (Fig. 997).. Fig. 996.—Anatomy of relations to brain, nerves and vessels. 1, Superior ligament of malleolus2, superior ligament of incus; 3, cerebral semicircular canal; 4, cerebellar semicircularcanal; 5, ampullary branch of vestibular nerve to 9 ampulla; 6, utricle; 7, ampullary branchof vestibular nerve to 3 ampulla; 8, ampullary branch of vestibular nerve to 4 ampulla;9, tympanomastoid semicircular canal; 10, utricular branch; n, saccus endolymphaticus;12, vestibular nerve; 13, head of malleus; 14, saccular branch; 15, external ligament; 16,cochlear nerve; 17, body of incus; 18, stapedius nerve; 19, facial nerve; 20, saccule; 21,membrane of cochlear window; 22, auditory nerve; 23, chorda tympani nerve; 24, drummembrane; 5, ductus cochlearis; 26, abducens nerve; 28, aqueductus cochleae; 29, ductusutriculosaccularis; 30, hypoglossal nerve; 31, glossoph
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsurgery, bookyear1920
