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

Was this article helpful?

0 0
Guaranteed – Six Pack Abs in Six Weeks

Guaranteed – Six Pack Abs in Six Weeks

Before we start working on how to get six pack abs in six weeks, there should be clarity in our mind about the need for six abs. Ones' personality is the key to his interaction with others. How we look, increases our confidence and boost up our self esteem. It's just not a person’s own confidence that goes up, but the other people around him also have more confidence in a fit and a healthy person.

Get My Free Ebook

Post a comment