. Principles of human physiology : with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students. r movement to be a sort of rotation in aplane which is nearly horizontal, but partly downwards, so that their verti-cal planes may be made to separate from each other, and at the same timeto assume a slanting position. Thischange of place will be better under-stood, when the action of the musclesis described. To the summit of thearytenoid cartilages are attached thechordae vocctles or vocal ligaments,which stretch across to the front ofthe
. Principles of human physiology : with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students. r movement to be a sort of rotation in aplane which is nearly horizontal, but partly downwards, so that their verti-cal planes may be made to separate from each other, and at the same timeto assume a slanting position. Thischange of place will be better under-stood, when the action of the musclesis described. To the summit of thearytenoid cartilages are attached thechordae vocctles or vocal ligaments,which stretch across to the front ofthe thyroid cartilage; and it is uponthe condition and relative situationof these ligaments, that their actiondepends. It is evident that theymay be rendered more or less tense,by the movement of the thyroid car-tilage just described; being tight-ened by the depression of its frontupon the cricoid cartilage, and slack-ened by its elevation. On the otherhand, they may be brought intomore or less close apposition by themovement of the arytenoid carti-lages; being made to approximateclosely, or to recede in such a man-ner as to cause the rima gflottidis to. Birds-eye view of larynx from above, afterWillis, g e h, the thyroid cartilage, embracingthe ring of the cricoid r u x w, and turning uponthe axis x z, which passes through the lower aSSUme the form Of a narrow V, by hornsc> ; n p,nf,the arytenoid cartilages, .1 i . f .i ,-i connected by the arytenoideus transversus: T v, T the revolution of _ these Cartilages, v, the vocal ligaments; n x, the right crico-aryle- We shall nOW inquire into the actions noideus lateralis (the left being removed); v kf, of the muscles upon the several parts the ri=ht thyro-arytenoideus (the left being re- r ,. ]£ A. moved; N Z, u I, the cnco-arytenoidei postici; B B, Of this apparatus; and first into those the crico-arytenoid ligaments. of the larynx alone. 403. The depression of the front of the Thyroid cartilage, and the conse-quent tension
Size: 1658px × 1507px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, bookpubli, booksubjectphysiology
