. El campo canadiense-naturalista. 2004 Doust y Nicholson: lesión cervical en un coyote 245. Figura 1. Vista lateral derecha del cuello de un coyote. El cadáver está tumbado sobre su espalda, con la cabeza hacia la izquierda. El cable de lazo ha cortado a través de la tráquea (T) y ahora se interpuso entre ella y el esófago (E). La distorsión de la pared de la tráquea, justo encima del cable ha sido causada por tejido cicatricial de reparación. Una varilla metálica ha sido insertado en el lumen del esófago. La arteria carótida común (C) y (V) el tronco vagosympathetic son claramente visibles a la izquierda del cable. La cerradura de la sn

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. The Canadian field-naturalist. 2004 Daoust and Nicholson: Neck Injury in a Coyote 245. Figure 1. Right lateral view of the neck of a Coyote. The carcass is lying on its back, with the head to the left. The cable from a snare has cut through the trachea (T) and is now lodged between it and the esophagus (E). The distortion of the wall of the trachea just above the cable as been caused by scar tissue of repair. A metal rod has been inserted in the lumen of the esophagus. The common carotid artery (C) and vagosympathetic trunk (V) are clearly visible to the left of the cable. The lock of the snare is at the bottom of the picture. (Bar = 2 cm.) of at least one of the vagosympathetic trunks is, how- ever, essential to life. The vagal (parasympathetic) portion of these nerves originates in the brain and supplies efferent and afferent innervation to many vital organs, including the cardiovascular system and digestive tract (Andrews and Lawes 1992; Esler 1992; Guy ton and Hall 1996). In particular, vagal stimula- tion protects against excessive stimulation of cardiac function by the sympathetic nervous system during physical activity and stress. In this Coyote, it was not possible to dissect the vagosympathetic trunk on either side of the affected portion of trachea, because both trunks were well embedded in scar tissue at this level. However, careful microscopic examination showed that both trunks were in large part morphologically in- tact. Although their structure had likely been stretched, and their path distorded, by the cable, the gradual pro- cess through which this happened would presumably have provided sufficient time for anatomic and physio- logical compensation. The exact cause of the eventual demise of this coy- ote was not clear. There are undocumented reports by veterinary practitioners of collars being left permanent- ly on growing dogs and eventually becoming buried under the skin, with damage limited to chronic sup- puration of the subcutis (J. B. Miller