32 OUTLINES OF ANATOMY. 



Muscles of mastication, 468. (462) 



Temporal fascia. 



Masseteric fascia. 

 Masseter, 469. (462-3) 



Origin. Insertion. Structure. Nerve-supply. Action. Relations. 



Divide the temporal fascia along the upper border of the zygoma, reflect it upward and remove it, ex- 

 posing the upper portion of the temporal muscle. Saw through the zygomatic arch at the anterior and 

 posterior borders of the masseter and turn the muscle downward to its insertion ; in doing this, note 

 the vessels and nerves entering its deep surface, then divide them close to the muscle. The insertion of 

 the temporal will then be exposed. 



Temporal muscle, 469-70. (463-4) 



Origin. Insertion. Structure. Nerve-supply. Action. Relations. 



With the saw, divide the coronoid process by an oblique cut, extending from the centre of the sigmoid 

 notch to the concavity of the mandible, see Fig. 313, p. 471. (465). Raise the coronoid process 

 with the attached temporal muscle, separating it from the structures immediately subjacent. Carefully 

 reflect the muscle upward toward the insertion. In reflecting the muscle note the vessels and nerves 

 entering its deep surface. Trace the middle and deep temporal vessels, and the deep temporal nerves ; 

 also the temporal branch of the temporo-malar nerve. To expose the structures in the pterygoid region 

 part of the posterior portion of the mandible must be removed. Divide the neck of the mandible trans- 

 versely; with the knife handle carefully separate the structures from the inner surface of the ramus as far 

 down as the mandibular foramen ; having determined the position of the foramen, divide the ramus by a 

 horizontal incision just above that point and remove the portion of bone between the two incisions. 

 Dissect out the fat and areolar tissue, exposing the vessels, nerves, and muscles. 



Internal maxillary artery, 522-3. (514-15) 

 First part of its course. 

 Second part of its course. 

 Third part of its course. 

 Branches of the internal maxillary, 523-4. (515) 



From the first part. 



From the second part. 



(From the third part.) 



Branches of the First Part of the Internal Maxillary Artery, 524-5. 

 (515-16-17} 



Deep auricular. 



Tympanic branch, or Glaserian artery. 



Middle or great meningeal. 



Mandibular artery : 



(Incisive.) 



(Mental.) 



Lingual or gustatory branch. 



Mylo-hyoidean branch. 



Small meningeal. 



Branches of the Second Part of the Internal Maxillary Artery, 526. (5/7) 



Masseteric branch. 



Posterior deep temporal. 



Internal pterygoid branches. 



External pterygoid branches. 



Buccal branch. 



Anterior deep temporal branch. 



But one branch of the third portion of the internal maxillary artery can be exposed at the present stage 

 of the dissection the posterior dental or alveolar branch. 



Posterior dental, or alveolar branch, 526. (517) 

 Branches : Antral. 



Dental. 



Alveolar, or gingival. 



Buccal. 



