1 Cochlear recess. Recessus cochlearis. Depression lying below and in front of the spherical recess. It is occupied by the lower end of the cochlear duct. C

2 Maculae cribrosae. Perforated bony areas 18 transmitting fibers of the vestibulocochlear nerve.

3 Macula cribrosa superior. Perforated bony 19 area transmitting fibers of the utriculoampul-lar nerve. C

4 Macula cribrosa media. Perforated bony area near the base of the cochlea for passage of fibers of the saccular nerve. C

5 Macula cribrosa inferior. Perforated bony 21 area in the wall of the posterior osseous ampulla for passage of fibers of the posterior am-pullar nerve. C

6 Osseous semicircular canals. Canales semicirculares ossei. Bony canals containing per-ilymph and enclosing the membranous semicircular ducts (filled with endolymph). C

7 Anterior (superior) semicircular canal. Canalis semicircularis anterior. Canal sharing a commn crus with the posterior semicircular canal and oriented vertically, somewhat perpendicular to the axis of the petrous part of the temporal bone. B

8 Posterior semicircular canal. Canalis semicir-cularis posterior. Posterior and most inferior semicircular canal. It lies somewhat parallel to the axis of the petrous part of the temporal bone. B

9 Lateral semicircular canal. Canalis semicircu-laris lateralis. Horizontally oriented canal that sometimes creates a bulge in the medial wall of the tympanic cavity. B

10 Osseous ampullae. Ampullae osseae. Dilatations close to the base of the semicircular crura. They lodge the membranous ampullae. C

11 Anterior osseous ampulla. Ampulla ossea anterior. Ampulla of the anterior semicircular canal located proximal to the ampulla of the lateral semicircular canal. B

12 Posterior osseous ampulla. Ampulla ossea posterior. Ampulla ofthe posterior semicircular canal. It lies below the plane of the lateral semicircular canal. B

13 Lateral osseous ampulla. Ampulla ossea lateralis. Ampulla of lateral semicircular canal. It lies near the anterior semicircular ampulla. B

14 Crura ossea. Osseous crura of the semicircular canals.

15 Common osseous crus. Crus osseum commune. Posteriorly situated common limb formed by the union of the crura of the superior and posterior semicircular canals. B

16 Simple osseous crus. Crus osseum simplex. Posteriorly situated crus of the lateral semicircular canal opening independently into the wall of the vestibule. B

Feneis, Pocket Atlas of Human Anatomy © 2000 Thieme

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