. 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 unites 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 part (Pars digestoria) has a stratified squ
. 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 unites 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 part (Pars digestoria) has a stratified squamous epithelium. The communication between the two is oval. Hyo - glossy s '^" oTTto -"^ Fig. 349.—Posterior Part of a Sagittal Section of Head and Part of Neck op Horse, Cut about 1 cm. to the Left of the Medlvn Plane. 1, Posterior nares; 3, pharyngeal orifice of Eustachian tube; 3, aditus laryngis; 4^ aditus cesophagi; o, posterior pillar of soft palate; a', junction of S with its fellow over entrance to cesophagus; 6, epiglottis; 7, body of thyroid cartiJage; S, arytenoid cartilage; 9, 9, cricoid cartilage; 10, true vocal cord; 11, false vocal cord; 12, lateral ventricle of larynx; 13, crico-arj^enoideus dorsalis; l^, cesophagus; 15, external carotid artery; 16, hypoglossal nerve; 17, glosso-pharyngeal nerve; .Z5, great cornu of hyoid bone; i5, Eustachian tube; ^0, body of hyoid bone; ^i, hyoideus transversus; 22, ridges of hard palate; 22', soft palate; 23, septum between frontal sinuses; 24-, olfactory mucous membrane; 25, sphenoidal sinus; 26, basilar part of occipital bone; 20', supra-occipital; 27, body of sphenoid bone; 2S, pituitarj'- body; 29, chiasma opticum; 30, corpora quadrigemina; 31, thalamus; 32, arachnoid; 33, odontoid ligament; 34, posterior auricular muacles. 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 pi
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