SENSE ORGANS AND COMMON INTEGUMENT 



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Organ of hearing 



Internal ear 

 Membranous labyrinth 



Endolymphatic duct 



Endolymphatic sac 



Utriculosaccular duct 



Utricle 



Semicircular ducts 



Superior semicircular duct 

 Posterior semicircular duct 

 Lateral semicircular duct (O. T. ex- 

 ternal) 



Membranous ampullae 

 Ampullary sulcus 

 Ampullary crest 

 Superior membranous ampulla 

 Posterior membranous ampulla 

 Lateral membranous ampulla 



Saccule 



Uniting duct (O. T. canalis reuniens) 



Acoustic spots 



Acoustic spot of utricle 

 Acoustic spot of saccule 



Ear-stones 



Endolymph 



Perilymph 



Perilymphatic space 



Perilymphatic ducts 



Cochlear duct (O. T. mem- 

 branous cochlea, or scala 

 media) 



Cupular blind sac 



Vestibular blind sac 



Basilar layer 



Vestibular membrane of Reissner 



Spiral ligament of cochlea 



Spiral prominence 



Vascular stripe 



Spiral sulcus 



Tympanic lip 



Openings for nerves 



Vestibular lip 



Spiral ganglion of cochlea 

 Spiral organ of Corti 

 Vessels of internal ear 

 Internal auditory artery 



Vestibular rami 



Cochlear ramus 



Arterial glomeruli of cochlea 

 Internal auditory veins 



Spiral vein of modiolus 

 Prominent vessel 



Vestibular veins 



Vein of aqueduct of vestibule 



Vein of canaliculus of cochlea 



Osseous labyrinth 



Vestibule 

 Spherical recess (O. T. fovea hemi- 



sphaerica) 

 Elliptical recess (O. T. fovea hemiel- 



liptica) 



Crest of vestibule 

 Pyramid of vestibule 

 Cochlear recess 

 Perforated spots 



Superior perforated spot 



Middle perforated spot 



Inferior perforated spot 

 Osseous semicircular canals 



Superior semicircular canal 



Posterior semicircular canal 



Lateral semicircular canal (O. T. ex- 

 ternal) 

 Osseous ampullae 



Superior osseous ampulla 



Posterior osseous ampulla 



Lateral osseous ampulla 

 Ampullary limbs 

 Common limb 

 Simple limb 



Cochlea (" snail shell ") 



Cupola 



Base of cochlea 



