Chapter 15 Special Senses Part 3

Chapter 15 Special Senses Part 3 - Chapter 15 Special...

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Chapter 15 Special Senses Part 3 Dr. Angela Peterson-Ford
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Ear Ossicles The tympanic cavity contains three small bones: the malleus, incus, and stapes Transmit vibratory motion of the eardrum to the oval window Dampened by the tensor tympani and stapedius muscles
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Ear Ossicles Figure 15.26
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Inner Ear Bony labyrinth Tortuous channels worming their way through the temporal bone Contains the vestibule, the cochlea, and the semicircular canals Filled with perilymph Membranous labyrinth Series of membranous sacs within the bony labyrinth Filled with a potassium-rich fluid
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Inner Ear Figure 15.27
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The Vestibule The central egg-shaped cavity of the bony labyrinth Suspended in its perilymph are two sacs: the saccule and utricle The saccule extends into the cochlea
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The Vestibule The utricle extends into the semicircular canals These sacs: House equilibrium receptors called maculae Respond to gravity and changes in the position of the head
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The Vestibule Figure 15.27
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The Semicircular Canals Three canals that each define two- thirds of a circle and lie in the three planes of space Membranous semicircular ducts line each canal and communicate with the utricle The ampulla is the swollen end of each canal and it houses equilibrium receptors in a region called the crista ampullaris These receptors respond to angular
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The Semicircular Canals Figure 15.27
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The Cochlea A spiral, conical, bony chamber that: Extends from the anterior vestibule Coils around a bony pillar called the modiolus Contains the cochlear duct, which ends at the cochlear apex Contains the organ of Corti (hearing receptor)
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The Cochlea The cochlea is divided into three chambers: Scala vestibuli Scala media Scala tympani
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The Cochlea The scala tympani terminates at the round window The scalas tympani and vestibuli: Are filled with perilymph Are continuous with each other via the helicotrema The scala media is filled with endolymph
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Chapter 15 Special Senses Part 3 - Chapter 15 Special...

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