Membranous labyrinth

Membranous labyrinth (labyrinthus membranaceus) (Fig. 293), the shape and structure is identical with the bone of the labyrinth and differs only in size, as is inside the bone. The gap between the bone and the membranous labyrinth filled with perilymph, and the cavity of the membranous labyrinth - the endolymph.

The walls of the membranous labyrinth formed connective tissue layer, the primary membrane and the epithelial layer.

In Fig. 292.
Membranous labyrinth cut through the main curl snails
1 - vestibular canal;
2 - the rod;
3 - cochlear duct (membranous cochlea);
4 - the covering membrane;
5 - Spiral membrane;
6 - basilar plate;
7 - Corti (spiral) body;
8 - spiral bone plate;
9 - tympani;
10 - Bone wall snails

Membranous vestibule consists of two pits: elliptical, which is called the utricle (utriculus) (Fig. 293), and spherical - sac (sacculus) (Fig. 293). The pouch goes in endolymphatic duct (ductus endolymphaticus) (Fig. 293), which ends on endolymphatic sac (saccus endolymphaticus) (Fig. 293). Both deepen with membranous semicircular canals (Fig. 293), which connects to my dearest, and form the vestibular apparatus is the organ of equilibrium. They are peripheral nerve vestibular apparatus (n. vestibularis). Membranous semicircular canals have a common webby leg (crus membranaceum commune) (Fig. 293) and connected to the bony semicircular canals, which are deposited by means of connective tissue strands. Sac communicates with the cavity cochlear canal.

In Fig. 293.
Membranous labyrinth
1 - front membranous semicircular duct;
2 - nerve utricle;
3 - my dear;
4 - sac;
5 - membranous cochlea (cochlear duct);
6 - Total membranous stalk;
7 - the cochlear nerve;
8 - endolymphatic sac;
9 - endolymphatic duct;
10 - the nerve sac;
11 - lateral membranous semicircular duct;
12 - posterior membranous semicircular duct;
13 - nerves vials;
14 - ampullar ends of the membranous semicircular canals

The membranous cochlea, which is also called the cochlear duct (ductus cochlearis) (Fig. 292, 293), includes a peripheral apparatus cochlear nerve (n. cochlearis) (Fig. 293). On the basilar plate (lamina basilaris) (Fig. 292) the cochlear duct, which is a continuation of the osseous spiral lamina, is a ledge neuroepithelium, called a spiral or Corti's organ (organum spirale) (Fig. 292). It consists of supporting and epithelial cells, which are located on the main membrane. They are suitable fibril - the main processes of nerve cells of the ganglion. It is the organ of Corti is responsible for the perception of auditory stimuli as well as neural processes are part of the cochlear receptors preddverno-cochlear nerve. Over the spiral organ is the covering membrane (membrana tectoria) (Fig. 292).






List of Abbreviations

a., aa. — arteria, arteriae (artery, the artery)

lig., ligg. — ligamentum, ligamenta (ligament, the ligaments)

m., mm. — musculus, musculi (muscle, the muscle)

n., nn. — nervus, nervi (nerve, the nerve)

r., rr. — ramus, rami (branch)

s. — seu (or)

v., vv. — vena, venae (vienna)