A Global Economy without a Global Government by Hwa A. Lim

By Hwa A. Lim

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The bird is able to make up this difference in a number of ways. Even though the duct is shorter, the basilar membrane is considerably wider, allowing more hair cells per unit length. The hair cells form a continuous ridge along the basilar membrane in birds and contains up to ten times the number of hair cells in cross section. Therefore, the total number of hair cells may be similar between birds and mammals. Auditory performance The auditory performance of birds differs from mammals in several aspects.

The scala vestibuli is vestigial, but remnants of it persist apically as the fossa of the scala vestibuli and basally as the cistern of the scala vestibuli. The scala tympani and the remnants of the scala vestibuli connect with each other via the apical interscalar canal and the basal interscalar canal. S. King & J. McLelland, p. 306. ) The Special Senses of Birds Facial disc 33 Facial ruff Operculum Facial disc Facial ruff Fig. 7 Facial disc, facial ruff and operculum of the barn owl. In the drawing on the left the facial disc is intact.

The inner ear The inner ear of birds is basically similar to that of mammals. It consists of a bony labyrinth that encloses a membranous labyrinth. The bony labyrinth includes the vestibule, semicircular canals and the cochlea. The space between the bony and the membranous labyrinths is filled with perilymph while the fluid contained within the membranous 34 Essentials of Avian Medicine and Surgery labyrinth is endolymph. Part of the membranous labyrinth includes components of the vestibular system which provides sensory information as to the location of the head in three-dimensional space.

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