Quain's elements of anatomy . f the tympanum. Immediatelyin front of the fenestra ovalis the tendon of the muscle bends at nearlya right angle over the end of the processus cochleariformis as roimd a MUSCLES OF THE TYMPANUM. 443 pulley, and, contained in a iibroiis sheath, passes outwards, to be insertedinto the inner part of the handle of the malleus, close to its root. The stajpedius is a very distinct muscle, but is hid within the bone,being lodged in the descending part of the aqueductus Fallopii and in thehollow of the pyramid. The tendon issues from the aperture at the apexof that little
Quain's elements of anatomy . f the tympanum. Immediatelyin front of the fenestra ovalis the tendon of the muscle bends at nearlya right angle over the end of the processus cochleariformis as roimd a MUSCLES OF THE TYMPANUM. 443 pulley, and, contained in a iibroiis sheath, passes outwards, to be insertedinto the inner part of the handle of the malleus, close to its root. The stajpedius is a very distinct muscle, but is hid within the bone,being lodged in the descending part of the aqueductus Fallopii and in thehollow of the pyramid. The tendon issues from the aperture at the apexof that little elevation (fig. 374), and passing forwards, surrounded bya fibrous sheath, is inserted into the neck of the stajDCS posteriorly, closeto the articulation of that bone with the lenticular process of the incus. A very slender spine of bone has been foimd occasionally in the tendon of thestapedius in man : and a similar piece of bone, though of a rounder shape, existsconstantly in the horse, the ox, and other animals. Fi^. Fig. 382.—Profile view of the left membrana ttmpani and atjuitoey ossicles FROM BEFORE AND SOMEWHAT FROM ABOVE. MAGNIFIED FOUR TIMES. (E. A. S.) The anterior half of the membrane las been cut away by an oblique slice, m, headof the malleus ; sp, spur-like projection of the lower border of its articular surface;pr. hr, its short process ; pr. gr, root of processus gracilis, cut; , suspensory liga-ment of the malleus; , its external ligament; , tendon of the tensor tympani, cut;i, incus, its long process ; at, stapes in fenestra ovalis ; , external auditory meatus ;, notch of Rivini ; , membrana tympani ; u, its most depressed point or umbo ;d, declivity at the extremity of the external meatus ; , internal auditoiy meatus ;a and b, its upper and lower divisions for the corresponding parts of the auditory nerve ;, canal for the nerve to the ampulla of the posterior semicircular canal ; , ampul-lary end of th
Size: 1713px × 1459px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
