THE HEAD AND NECK. 31 



foramen in the frontal bone ; (9) the intermaxillary suture ; (10) the naso-frontal 

 suture ; (i i) the superciliary ridge ; (12) the interfrontal or metopic suture or its 

 remains. 



ON THE BASE OF THE SKULL (Fig. 1 1) LOCATE: (i) The foramen magnum ; (2) 

 the occipital condyles ; (3) the digastric groove for the posterior belly of the digas- 

 tric muscle ; (4) the jugular process for the rectus capitis lateralis ; (5) the styloid 

 process of the temporal bone ; (6) the glenoid fossa with the Glaserian fissure 

 dividing the articular from the non-articular part of the same ; (7) the internal and 

 external pterygoid plates of the pterygoid process of the sphenoid bone ; (8) the 

 pterygoid fossa for the internal pterygoid muscle ; (9) the jugular foramen for 

 the ninth, tenth, eleventh nerves and jugular vein ; (10) the carotid canal in the 

 petrosa for the internal carotid artery and sympathetic nerve ; (i i) the foramen 

 spinosum for the great meningeal artery ; (12) the posterior nares 1(13) the hard 

 palate ; (14) the hamular process, around which plays the circumflexus palati. 



LOCATE THE ATTACHMENT OF THESE MUSCLES (Figs. 7-10): (i) Temporal ; 

 (2) masseter ; (3) pterygoid, internal and external ; (4) buccinator ; (5) platysma ; 

 (6) digastric ; (7) orbicularis oris ; (8) depressor labii inferioris ; (9) levator menti ; 

 (10) levator labii superioris ; (i i) levator anguli oris ; (12) corrugator supercilii ; 

 (13) zygomaticus, major and minor ; (14) compressor naris ; (15) depressor alae 

 nasi ; (i 6) levator labii superioris alaeque nasi ; (17) the rectus capitis anticus, 

 major and minor; (18) the tensor palati; (19) the azygos uvulae; (20) levator 

 palati ; (21) tensor tympani ; (22) depressor anguli oris. 



LOCATE THE FOLLOWING FISSURES : (i) The fronto-parietal ; (2) the temporo- 

 parietal ; (3) the interparietal or sagittal ; (4) the occipito-parietal ; (5) the 

 interfrontal ; (6) the fronto-nasal ; (7) the fronto-maxillary ; (8) the malo-frontal ; 

 (9) the malo-zygomatic ; (10) the malo-maxillary ; (11) the naso-maxillary ; 

 (12) the intermaxillary ; (13) the symphysis menti ; (14) the spheno-maxillary ; 

 (15) the petro-occipital ; (16) the palato-maxillary ; (17) temporo-mandibular 

 and occipito-atloid articulations are the only movable joints in this region. 



INCISIONS FOR LOCATING THE FOLLOWING STRUCTURES : 



1. The supraorbital nerve, artery, and vein (fifth nerve and seventh nerve). 



2. The infraorbital nerve, artery, and vein (fifth nerve and seventh nerve). 



3. The mental nerve, artery, and vein (fifth nerve and seventh nerve). 



4. The facial artery and vein and their branches. 



5. The facial nerve and its facial branches and communications. 



6. The duct of Stenson and transverse facial artery. 



The Mental Nerve. Turn the skin aside from the intersectional point indi- 

 cated in figure 1 2. With the forceps dissect out the leash of mental nerves, anp 

 find them continuous with branches of the facial nerve, or seventh cranial. (Fig. 

 1 6.) Find also the mental branch of the inferior dental artery coming through 

 the same foramen the mental. 



The Supraorbital Nerve. Turn the skin back, beginning at the intersectional 

 point in the figure. Find with the forceps the leash of the supraorbital nerve 

 (Fig. 1 6) anastomosing with the supraorbital part of the facial portion of the 

 seventh nerve. 



The Infraorbital Nerve. Turn the skin back, beginning at the intersectional 

 point in the figure. Here, with the forceps, you will find a large leash of nerves, 

 the terminus of the infraorbital nerve. You will see that its branches are con- 

 tinuous with the infraorbital portion of the seventh cranial nerve. Find also the 

 branches of the infraorbital artery accompanying the nerve. 



Stenson' S duct is the excretory duct for the parotid gland. Turn the skin 

 back from the intersectional point indicated. Above the duct you will find the 

 transverse facial artery, a small branch of the temporal. Below the duct you 

 will find branches of the facial nerve. 





