. The anatomy of the domestic animals . Veterinary anatomy. 52-i RESPIRATORY SYSTEM OF THE HORSE lymph ducts and cervical lymph glands. The oesophagus lies on its left face from the third cervical vertebra backward. The sterno-cephalicus muscles cross it very obliquely, passing from the ventral surface forward over its sides, and diverging to reach the angles of the jaw. The omo-hyoidei also cross it very obliquely, passing over the lateral surfaces of the tube, and converging ventrally in the laryngeal region. The sterno-thyro-hyoideus lies on the ventral surface.^ The scaleni lie on either s
. The anatomy of the domestic animals . Veterinary anatomy. 52-i RESPIRATORY SYSTEM OF THE HORSE lymph ducts and cervical lymph glands. The oesophagus lies on its left face from the third cervical vertebra backward. The sterno-cephalicus muscles cross it very obliquely, passing from the ventral surface forward over its sides, and diverging to reach the angles of the jaw. The omo-hyoidei also cross it very obliquely, passing over the lateral surfaces of the tube, and converging ventrally in the laryngeal region. The sterno-thyro-hyoideus lies on the ventral surface.^ The scaleni lie on either side near the entrance to the thorax. The thoracic part (Pars thoracalis) of the trachea (Figs. 553, 554) passes back- Ohliquus capitis poslurior Inter trans versalis Longissimub capitis et atlantis T Rectus c ventralis i Brachiocephal hum. Vago-. ji thcti t Carotid a Recurrent nerve Jugular rein Sterno- cephalicus. Omo-hyoideus Sterno-thyroideus Sterno-hyoideus Fig. 468,—Cross-section of Ventral Part of Neck of Horse. This section is cut at right angles to the long axis of the neck, passing through the junction of the second and third cervical vertebrge. ., Spinal cord; , spinal vein; , , vertebral vein and artery; , transverse process (tip); F, inter^^ertebral fibro-cartilage; T, atlantal tendon common to brachiocephahcus, splenius, and longissimus atlantis; M, digitation of brachiocephalicus inserted by T. ward between the pleural sacs and divides into two bronchi over the left atrium of the heart. It is related dorsally to the longus colli for a short distance, and beyond this to the oesophagus. Its left face is crossed by the aortic arch, the left brachial artery, and the thoracic duct. Its right face is crossed by the vena azygos, the dorso-cervical and vertebral vessels, and the right vagus nerve. Ventrally it is related to the anterior vena cava, the brachiocephalic and common carotid trunks, and the car- diac and left recurrent nerves. 1 The arrange
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