30 OUTLINES OF ANATOMY. 



Cervical Nerves, Deep Branches: 



Nerves to the scalenus rnedius. 

 Nerves to the levator angulse scapulae. 

 Branches to the trapezius. 

 (Internal branches) : 



Communicating branches. 

 Muscular branches : 



Branch to the rectus capitis lateralis. 

 Nerve to the rectus capitis anticus minor. 

 Nerve to the rectus capitis anticus major. 

 Nerve to the longus colli. 



, f Communicantes hypoglossi, ansa hypoglossi. 

 ' ( Phrenic nerve. 



f Communicans hypoglossi and phrenic nerves should be traced ; the other 

 branches can be shown in the dissection of the deeper structures. 



The common carotid artery and its divisions should now be exposed. The origin and thoracic por- 

 tion of the left common carotid will be shown at another time. The origin of the branches of the 

 external carotid should be exposed, and the branches should be traced to the point where they pass 

 into or under other structures. The terminal distribution of such branches will be developed later in 

 the dissection. The pneumogastric nerve and its branches will be considered in the deep dissection of 

 the neck ; the branches must be carefully preserved. 



Common carotid arteries, 504-5. (496-7) 

 External carotid. 

 Internal carotid. 



(Thoracic portion of the left common carotid artery), 505. (497) 

 Common carotid artery in the neck, 506-7-8-9. (498-9-500-1) 



When the artery and its divisions have been fully exposed, the sterno-mastoid should be 

 replaced in position and the relations carefully studied. 



Relations: In front. 



Behind. 



Internally : 



Ganglion intercaroticum, or carotid gland. 



Externally. 

 Branches. 



Variations of the Common Carotid Arteries. 

 The collateral circulation. 



External carotid artery, 509-10. (501-2) 

 Relations: In front. 

 Behind. 

 Internally. 

 Externally. 



Chief Variations of the External Carotid Artery. 



Branches of the external carotid, 510. (502) 



Superior thyroid artery, 512-13. (503-4-5) 

 Branches of the superior thyroid artery : 

 Hyoid or infra-hyoid branch. 

 Sterno-mastoid or middle mastoid artery. 

 Superior laryngeal artery. 

 Crico-thyroid or inferior laryngeal branch. 

 Lingual artery, 513-14. (55- 6 ) 

 First or oblique portion : 

 Hyoid, or supra-hyoid. 

 Facial artery, 515-16-17. (507-8-9) 

 Cervical portion : 



Branches of the facial artery in the neck : 

 (Inferior or ascending palatine.) 

 (Tonsillar branch.) 



