. The anatomy of the horse, a dissection guide. Horses. DISSECTION OF THE LARYNX. 237 The Superior Laryngeal Nerve has its origin described at page 199. It gives motor filaments to the crico-thyroid and crico-pharyngeus muscles; and then, penetrating the thyroid wing by the foramen near its supero-posterior angle, the nerve splits into sensory branches distrib- uted to the mucous membrane of the larynx, giving also twigs to the lining of the pharynx and oeso- phagus. The Inferior Laryngeal (Eecdr- rent) Nerve has its origin and course described at page 153. It is the motor nerve to all the int
. The anatomy of the horse, a dissection guide. Horses. DISSECTION OF THE LARYNX. 237 The Superior Laryngeal Nerve has its origin described at page 199. It gives motor filaments to the crico-thyroid and crico-pharyngeus muscles; and then, penetrating the thyroid wing by the foramen near its supero-posterior angle, the nerve splits into sensory branches distrib- uted to the mucous membrane of the larynx, giving also twigs to the lining of the pharynx and oeso- phagus. The Inferior Laryngeal (Eecdr- rent) Nerve has its origin and course described at page 153. It is the motor nerve to all the intrinsic muscles except the crico-thyroid, and it also gives some sensory twigs to the laryngeal mucous membrane. INTERIOR OF THE LARYNX. Directions. — A vertical incision should be made along the middle line of the larynx behind, severing the arytenoideus muscle and the bezel of the cricoid cartilage. By separating the lips of this incision, a view of the interior of the larynx from behind will be obtained, and this is to be supplemented by look- ing into the tube from its upper and lower apertures. The Superior Aperture of the larynx is a large orifice placed at the floor of the pharynx. It is bounded in front by the epiglottis, behind by the pitcher-like lip of the arytenoid cartilages and the fold of mucous membrane uniting them, and laterally by the aryteno-epiglottic fold of mucous membrane. During deglutition the epiglottis is folded over the aperture, which it closes like a lid. The Lower Aperture is circumscribed by the inferior edge of the cricoid cartilage, and is directly continued by the lumen of the trachea. The Glottis, or Eima Glottidis. This is a third aperture, placed about the middle of the tube of the larynx, which it divides into an upper and a lower compartment. In its anterior two-thirds this opening lies. Fig. 32. Larynx, back view. 1. Epiglottis; 2. Arytenoid Cartilage; 3. Thyroid Cartilage ; 4. Arytenoideus ; 5. Crico- Arytenoideus-Posticus; 6. Cricoid
Size: 1192px × 2096px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjecthorses, bookyear1902
