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HENRY C. TRACY 



RX, recurrent ramus of vagus nerve 



S, sacculus 



SB, body of the swimbladder 



SC, septum of anterior osseous capsule 



SCA, anterior semicircular canal 



SCL, lateral semicircular canal 



SCP, posterior semicircular canal 



SPA, sphenotic bone 



SPP, subcerebral plate of perilaby- 



rinthine tissue 

 SS, superior sinus of the utriculus 

 SSC, saccular subcerebral perilaby- 



rinthine canal 

 TPEXO, triangular plate of the exoc- 



cipital bone 

 TPP, triangular plate of perilabyrin- 



thine tissue lateral to utriculus and 



sacculus ('accessory bulb' of Bres- 



chet) 

 USC, utricular subcerebral perilaby- 



rinthine canal 

 USC A, utricular subcerebral perilaby- 



rinthine canal anterior to the lips of 



the fenestra 

 USCP, utricular subcerebral canal 



posterior to the lips of the fenestra 

 VN, vein 



VT, vertebral column 

 VI, abducens nerve 



VIII, acustic nerve 



IX, glossopharyngeal nerve 



*, ridge in thickened roof of utriculus 

 which is continuous with the peri- 

 meningeal tissue lining the lateral 

 wall of the cranium 



