The topographical anatomy of the head and neck of the horse / [O. Charnock Bradley].
- Orlando Charnock Bradley
- Date:
- 1923
Licence: In copyright
Credit: The topographical anatomy of the head and neck of the horse / [O. Charnock Bradley]. Source: Wellcome Collection.
92/248 page 76
![the soft palate. The medial lamina is that part of the cartilage which widens towards the pharyngeal ostium, and it is this that constitutes the basis of the broad, valve-like projection at the ostium. For a short distance close to the temporal bone the edges of the laminae are united by fibrous tissue ; but for the greater part they are separated by the elongated slit through which the diverticulum is protruded. Because of the disposition of the cartilage, the lumen of the tube is slit-like in transverse section, and its calibre increases from the tympanic to the pharyngeal ostium. The soft palate (Palatum mode).—The soft palate is a long (about 15 cm.) and broad, movable partition between the mouth and the pharynx. One border is attached to the posterior margin of the bony palate; while the other border is free and gently concave (arcus palatinus). When the soft palate is at rest, its free border is in contact with the glosso-epiglottic fold of mucous membrane, and is overlapped by the curved free part of the epiglottis. The lateral borders of the soft palate are connected with the palatine and pterygoid bones. The dorsal or pharyngeal surface forms a slightly curved and oblique continuation of the fioor of the nose. The ventral or oral surface, which is continuous with the hard palate, is slightly concave and in contact with the posterior part of the tongue, and is longitudinally folded. Prolongations of the mucous membrane of the soft palate are con¬ tinuous with the tongue and the wall of the pharynx in the form of folds known as the glosso-'palatine and p]caryngo-palatine arches (arcus glossopalatinus et arcus pharyngopalatinus). The glosso-palatine arch is a thick fold that passes from the lateral border of the tongue to the lateral part of the oral surface of the soft palate, and lies slightly behind the last cheek-tooth. The pharyngo-palatine arch is a prominent fold, continuous with the free border of the soft palate, and sweeps backwards along the lateral wall of the pharynx to unite with its fellow immediately dorsal to the opening into the oesophagus. In the anMe of diverofence of the two arches is the tonsillar sinus (sinus tonsillaris) in which the flattened p)alatine tonsil (tonsilla palatina)— a collection of lymphoid nodules and mucous glands—is readily dis¬ tinguished because of the presence of small flattened elevations and numerous tonsillar crypts. In the horse, the tonsil is not sharply defined, as it is in the dog, but extends beyond the proper limits of the tonsillar sinus and is diffused over the posterior part of the tongue (lingual tonsil). Structurally the soft palate may be described as composed of four](https://iiif.wellcomecollection.org/image/b29820066_0092.jp2/full/800%2C/0/default.jpg)
