. The anatomy of the domestic animals. Veterinary anatomy. 408 DIGESTIVE SYSTEM OF THE HORSE guttural pouches. From the Eustachian opening a fold of the mucous membrane (Plica salpingo-pharyngea) passes toward but does not reach the aditus laryngis. A horizontal fold, the posterior pillar of the soft palate (Arcus pharyngo-palatinus), passes along the ventral part of the lateral wall and iniites with its fellow over the entrance to the oesophagus. The dorsal part of the cavity (Pars respiratoria) is lined with a ciliated epithelium, while the ventral jjart (Pars digestoria) has a stratified sq
. The anatomy of the domestic animals. Veterinary anatomy. 408 DIGESTIVE SYSTEM OF THE HORSE guttural pouches. From the Eustachian opening a fold of the mucous membrane (Plica salpingo-pharyngea) passes toward but does not reach the aditus laryngis. A horizontal fold, the posterior pillar of the soft palate (Arcus pharyngo-palatinus), passes along the ventral part of the lateral wall and iniites with its fellow over the entrance to the oesophagus. The dorsal part of the cavity (Pars respiratoria) is lined with a ciliated epithelium, while the ventral jjart (Pars digestoria) has a stratified squamous epithelium. The communication between the two is oval. Fig. 349.—Posterior Part of a Sagittal Section of Head and Part of Neck of Hohse, Cut about 1 cm. to the Left of the Median Plane. 1, Posterior nares; 2, pharyngeal orifice of Eustachian tube; S, aditus laryngis; 4, aditus oesophagi; 5, posterior pillar of soft palate; 6\ junction of 6 with its fellow over entrance to oesophagus; 6, epiglottis; 7, body of thyroid cartilage; S, arytenoid cartilage; 9, 9, cricoid cartilage; 10, true vocal cord; 11, false vocal cord; 12, lateral ventricle of larynx; 13, crico-arytenoideus dorsalis; 14, cesophagus; lo, external carotid artery; 16, hypoglossal nerve; 17, glosso-pharyngeal nerve; iS, great cornu of hyoid bone; i9, Eustachian tube; 20, body of hyoid bone; 2i, hyoideus transversus; 2S, ridges of hard palate; 2«', soft palate; gS, septum between frontal sinuses; 24, olfactory mucous membrane; £S, sphenoidal sinus; Be, basilar part of occipital bone; 28', supra-occipital; 27, body of sphenoid bone; 2S, pituitary body; 29, chiasma opticum; SO, corpora quadrigemina; 32, thalamus; S2, arachnoid; SS, odontoid ligament; 34, posterior auricular muscles. and is bounded by the free edge of the soft palate and its posterior pillars; it is termed the pharyngeal isthmus. On either side of the aditus laryngis is a narrow deep depression, the piriform recess (Recessus piriformis). The
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