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1 Ductus reuniens. Fine tube connecting the sac- 19 cule with the cochlear duct. B

2 Saccule. Sacculus. Round vesicle, 2-3 mm in size, equipped with a sensory field. B

3 Maculae [[staticae]]. Sensory fields for the perception of the position of the head in space. A B

4 Utricular macula. Macula utriculi. Horizontally oriented sensory field, 2.3-3 mm in size, occupying the floor of the utricle. B

5 Saccular macula. Macula sacculi. Vertically oriented, arched sensory field, about 1.5 mm wide; in the medial wall of the saccule. B

6 Statoconia. Calcium concretions, up to 15 ^m in size, embedded in a gelatinous substance together with the sensory hairs. A

7 Statoconial membrane. Membrana stato-coniorum. Membrane covering the maculae and consisting of a gelatinous ground substance with statoconia on its surface. It is penetrated by bristle-like processes from underlying macular sensory cells. A

8 [[Neuroepithelium]. Pseudostratified, prismatic, sensory epithelium of the macula consisting of supporting and sensory cells. The sensory cells bear 20-25 ^m long bristle-like processes which project into the statoconial membrane. A

9 Cochlear labyrinth. Labyrinthus cochlearis. Complex contents of the osseous cochlea. C

10 Perilymphatic space. Spatium perilymphati-cum. Space occupied by perilymph and partially permeated by connective tissue fibers. It includes the scala vestibuli and tympani. A B

11 Scala vestibuli. Perilymphatic canal located above the osseous spiral lamina and cochlear duct. It ascends as far as the apex of the cochlea (helicotrema). C

12 Scala tympani. Perilymphatic canal below the osseous spiral lamina and basilar membrane. C

13 Cochlear aqueduct (perilymphatic duct). Aquaeductus cochleae. Pathway connecting the perilymphatic space with the subarachoid space. B

14 External aperture of perilymphatic duct.

Apertura externa aquaeductus cochleae. Opening for the tympanic nerve in the vicinity of the canaliculus. See p. 14.22

15 Cochlear duct. Ductus cochlearis. A spiral en-dolymphatic tube taking 21/2-23/4 turns around a bony axis (modiolus) before ending blindly at the apex of the cochlea. It houses the sensory epithelium for the perception of sound. B C E

16 Cupular cecum. Caecum cupulare. Blind end of cochlear duct located at the apex of the cochlea. B

17 Vestibular cecum. Caecum vestibulare. Blind end of the cochlear duct facing the vestibule. B

18 Tympanic wall of cochlear duct (spiral membrane). Paries tympanicus ductus cochlearis (membrana spiralis). Inferior wall of cochlear duct situated above the scala tympani. E

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