. Cunningham's Text-book de l'anatomie. L'anatomie. 1080 LE EESPIEATOEY SYSTÈME. Sa-. Thyreoid fevjLCommon la trachée artère carotide corps ife- .^^J^ thyreoid (oesophage artère inférieure gauche du nerf récurrent commun ,'^ JF, carotide -'J^p&Lt ; stimulation du nerf artère subclavière gauche * YREOID artère innommé corps [- nerf vague nerf vague plèvre L. artère subclavière gauche nerf récurrent * fascia cervical conduit thoracique et tégument, séparer la partie cervicale de la trachée de la surface. Dans le plan médian du cou il y a une forme de losange étroit espace entre les marges bénéficiaires de ces musc

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. Cunningham's Text-book of anatomy. Anatomy. 1080 THE EESPIEATOEY SYSTEM. Sa-. Thyreoid body Trachea fevjLCommon carotid artery ife- .^^J^ (Esophagus Inferior thyreoid artery Recurrent nerve Left common , 'Jf^, carotid artery —'J^p< Vagus nerve * Left subclavian artery YREOID BODY Innominate artery [— Vagus nerve Pleura Vagus nerve L. subclavian artery Left recurrent nerve * Thoracic duct cervical fascia and integument, separate the cervical part of the trachea from the surface. In the median plane of the neck there is a narrow diamond-shaped space between the medial margins of these muscles, within which the trachea is covered merely by the integuments and fasciae. It is important to note that in the inferior part of the neck the cervical fascia is in two layers—viz., a strong stratum applied to the ventral surface of the sterno-hyoid and sterno-thy- reoid muscles, and a weaker superficial layer stretching across between the two sterno-cleido-mastoid mus- cles. Dorsal to these muscular and fascial layers the inferior thyreoid veins pass down- wards on the ventral surface of the trachea, and sometimes the occasional thyreoidea ima artery passes upwards on the ventral aspect of the tube. At the superior border of the manubrium sterni the innominate artery may be seen crossing the trachea obliquely. The thoracic part of the trachea is situated in the dorsal part of the superior mediastinum, being separated from the bodies of the ver- tebrae by the oesophagus alone. Immediately above its bi- furcation the deep cardiac plexus of nerves is placed on the ventral and lateral sides of the trachea. At the level of the fourth thoracic vertebra the aortic arch is very intimately related to it, lying first on the ventral side of the tube, and there- after on its left side. The three great vessels which spring from the aortic arch are also placed in close proximity to the trachea. The innominate and the left common carotid arteries lie at first ventral to the trachea,

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