Suprameatal Spine 



Tympanic Cavity 



Posterior Semicircular 

 Canal 



Saccus Emlolymphaticus 

 Facial Nerve 



Lateral Sinus 



Mastoid Emissary Vein 

 Occipital Vein 



Spinal Accessory Nerve 



-Tympanic Cavity 



Short Process r»t Incus 



External (Horizontal) 

 Semicircular Canal 



Posterior Semicircular Canal 



Facial Nerve 



Lateral Sinus 



Digastric Muscle 



Fig. 27. Superficial Layer. 



Malleus 



■^'i^vij'v-.v.r.v^-^. a 



rig. 28, Deep Layer. 



Figs. 27 and 28. Tympanic Cavity and surrounding Parts opened from behind. 



Nal. Size. 



Kebman Limited, Loiulon. 



Rebman Company, New York. 



