The anatomy and physiology of the organ of hearing; with remarks on congenital deafness, the diseases of the ear, some imperfections of the organ of speech, and the proper treatment of these several affections / By David Tod.

  • Tod, David.
Date:
1832
Catalogue details

Licence: Public Domain Mark

Credit: The anatomy and physiology of the organ of hearing; with remarks on congenital deafness, the diseases of the ear, some imperfections of the organ of speech, and the proper treatment of these several affections / By David Tod. Source: Wellcome Collection.

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    The Helix, Antihelix, Tragus, Antitragus, Cavitas Innominata, Sepie or Fossa Navicularis, and the Concha. The Helix is me large folded margin, or curved border, which commences at the posterior superior part of the Lobus, and from thence ascends and forms the margin or border which surrounds the upper part of the Ala, and subsequently descends, and terminates anteriorly, nearly opposite to its beginning, in a ridge which divides the cavity called the Concha into two unequal chambers. The Antihelix is the large oblong eminence, which be- gins near the posterior extremity of the Helix, and from thence extends obliquely forwards and upwards, and ter- minates by dividing into two parts, a superior and an in- ferior, of which the latter assists in forming the superior part of the brim of the Concha. The Tragus is the small eminence situated below the anterior extremity of the Helix. In advanced age it is generally covered with hairs. The Antitragus is the small eminence situated a little below the posterior extremity of the Antihelix, and oppo- site to the Tragus. The Cavitas Innominata is the curved depression which is situated between the Helix and Antihelix. ~The Scapha or Fossa Navicularis is the small de- pression between the divisions of the anterior extremity of the Antihelix. The Concha is the large cavity whitelb; is bounded above by the Antihelix, below by the Lobus, before by the Tra- gus, and behind by the Antitragus. It is divided by the anterior extremity of the Helix into a small superior and a large inferior chamber, of which the latter leads to the Meatus Auditorius Externus. The Lobus is situated at the inferior part of the Ala. It is composed of cellular substance, with a small quantity of fat, and forms the inferior soft part of the Auricle. On the posterior surface of the Auricle we observe a considerable eminence, called the Dorsum of the Concha.