An essay on the deaf and dumb; showing the necessity of medical treatment in early infancy : with observations on congenital deafness / By John Harrison Curtis.

  • Curtis, John Harrison, 1778-approximately 1860.
Date:
1834
Catalogue details

Licence: Public Domain Mark

Credit: An essay on the deaf and dumb; showing the necessity of medical treatment in early infancy : with observations on congenital deafness / By John Harrison Curtis. Source: Wellcome Collection.

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    face, subdivided into certain curvilineal grooves, all of which are directed towards a canal formed in the root of the auricle — the meatus externus. The concha, the deepest and largest depression of the auricle, is situated at the entrance of the meatus externus. The boundaries of the concha are formed by four eminences, viz. the tragus, helix, antihelix, and anti- tragus. The tragus and helix bound it anteriorly, the antihelix and anti tragus posteriorly. The tragus is placed immediately behind the condyle of the lower jaw; it rises into a little knob, and lies on the forepart of the meatus externus. The helix arises from the concha, which it partially divides into a superior and inferior depression; it advances from its origin a little before the tragus, is soon reflected in the form of a curve, and, in its descent gradually becoming less distinct, is lost in a soft pendulous substance, called the lobe. The antihelix is situated within and opposite to the helix, and is formed with a similar curve : above it consists of two ridges, which unite, and the eminence formed by their union is continuous below with a little projection, called the antitragus, from its position being directly opposite to the tragus. Between the helix and antihelix is a considerable groove ; it increases in depth as it approaches the concha, in which it termi- nates. Another groove, placed between the two ridges of the antihelix, joins the former just before its termi- nation. These are the most remarkable appearances on this side of the auricle. The opposite side of the external ear possesses little requiring particular attention: it may be said to