SURFACE MARKINGS OF SPECIAL REGIONS OF HEAD AND NECK 1301 



of the incus. A narrow triangular patch extending downward and forward from the 

 umbo reflects the light more brightly than any other part, and is usually described 

 as the cone of light. 



Post, malleolar fold 

 Lonq crus of incus \ 



I Pars flaccida 



I Lat. proc. of malleus 

 Ant. malleolar fold 



Mamibrium 

 of malleus 

 Postero-superior 

 quadrant 



Postero-inferior 

 quadrant 



Antero-superior 



quadrant 

 Umbo 



Cone of light 



Antero-inferior quadrant 

 FIG. 1208. The right tympanic membrane as seen through a speculum. 



Groove for middle 

 temporal artery 



Parietal notch 



Suprameatal 

 triangle 



OCCIPITALIS 



Articular tubercle 

 Postglenoid process 



Mandibular fossa 



Petrotympanic fissure 

 Vaginal process 



STTLOGLOSSUS 



\ 



Occipital groove 



Tympanic part 



STYLOHYOIDEC3 





Styloid process 



FIG. 1209. Left temporal bone showing surface markings for the tympanic antrum (red), transverse sinus (blue), 



and facial nerve (yellow). 



Tympanic Antrum. The site of the tympanic antrum is indicated by the supra- 

 meatal triangle (Fig. 1209). This triangle is bounded above by the posterior root 

 of the zygomatic arch; behind by a vertical line from the posterior border of the 

 external acoustic meatus; in front and below by the upper margin of the meatus. 



The Neck (Fig. 1210). Larynx and Trachea. In the receding angle below the 

 chin, the hyoid bone (page 1288), situated opposite the fourth cervical vertebra, can 

 easily be made out. A finger's breadth below it is the laryngeal prominence of the 



