EXTERNAL CAROTID ARTERY. 



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Plan of Relations of the Common Carotid Artery. 



Li Front. 



Platysma, 



Descendens noni nerve, 



Omo-hyoid, 



Sterno-rnastoid, 



Sterno-hyoid, 



Sterno-thyroid. 



Externally. 



Ir/.erna. jugular vein, 

 Pneumogastric nerve. 



Internally. 

 Trachea, 

 Larynx, 

 Recurrent laryngeal nerve 



Behind. 

 Longus colli, 

 Rectus anticus major, 

 Sympathetic, 

 Inferior thyroid artery, 

 Recurrent laryngeal nerve. 



Additional Relations of the Left Common Carotid. 



Li Front. Behind. Internally. Externally 



Left vena innominata. Trachea, Arten'a innominata, Pleura. 



Thoracic duct. (Esophagus. 



EXTERNAL CAROTID ARTERY. 



The External carotid artery ascends nearly perpendicularly from oppo- 

 site the upper border of the thyroid cartilage, to the space between the 

 neck of the lower jfc^v and the meatus auditorius, where it divides into the 

 temporal and internal maxillary artery. 



Relations. In front it is crossed by the posterior belly of the digas- 

 tricus, stylo-hyoideus, and platysma myoides muscles ; by the hypoglossal 

 nerve near its origin ; higher up it is situated in the substance of the 

 parotid gland, and is crossed by the facial nerve. Behind, it is separated 

 from the internal carotid by the stylo-pharyngeus and stylo-glossus 

 muscles, glosso-pharyngeal nerve, and part of the parotid gland. 



Plan of the Relations of the External Carotid Artery. 



In Front. 

 Platysma, 

 Digastricus, 

 Stylo-hyoid, 

 Hypoglossal nerve, 

 Facial nerve, 

 Parotid gland. 



External Carotid Artery. 



Behind. 



Stylo-pharyngeus, 

 Stylo-glossus, 

 Glosso-pharyngeal nerve, 

 Parotid gland. 



