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md0006 - BASIC HUMAN ANATOMY.pdf - Raems.com

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11-33. THE INTERNAL EAR<br />

a. Labyrinths (Figure 11-13).<br />

Figure 11-13. The labyrinths of the internal ear.<br />

(1) Bony labyrinth. The bony labyrinth (LABYRINTH = a maze) is a <strong>com</strong>plex<br />

cavity within the temporal bone. It has three semicircular canals, a vestibule (hallway),<br />

and a snail-shaped cochlear portion.<br />

(2) Membranous labyrinth. The membranous labyrinth is a hollow tubular<br />

structure suspended within the bony labyrinth.<br />

b. Fluids of the Internal Ear. The endolymph is a fluid filling the space within<br />

the membranous labyrinth. The perilymph is a fluid filling the space between the<br />

membranous labyrinth and the bony labyrinth. These fluids are continuously formed<br />

and drained away.<br />

ENDO = within<br />

PERI = around<br />

MD0006 11-32

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