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Ears

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bawulugu's version from 2017-03-23 00:17

Section

Question Answer
Outer earAuricle, External acoustic meatus, Tympanic membraine
Elastic cartilage (directs sound waves into ear canal)Auricle
Ear canal (lined with skin, hair and ceruminous glands make cerumen aka earwax to protect the canal)External acoustic meatus
Ear drumTympanic membraine
Air-filled cavity lined by mucosaMiddle ear
Connected to nasopharynx by the auditory tubeMiddle ear
Tiny ear bonesOssicles (Malleus, incus, and stapes)
Bony labyrinth Filled with liquid perilymph Three parts - Cochlea, vestibule, semicircular canalsInner ear
Receptor cells inside membranous labyrinth have specialized processesHair cells
The receptors in the utricle and saccule are calledMaculae
Embedded in gelatinous otolithic membraneHair cells
Are calcium carbonate crystals packed inside the otolithic membrane, giving it massOtoliths
Sensitive to horizontal movementsMacula in utricle
Sensitive to vertical movementsMacula in saccule
Balance information carried on thevestibular portion of the vestibularcochlear nerve (CN VIII)
Positional information received in thecerebellum and other brain regions
high and low points Crests and trough
distance between successive crests or troughs Wavelength
height of wave; indication of volume (decibels; dB)Amplitude
waves per second; pitch (Hertz; Hz) Frequency
are inversely proportionalWavelength and frequency
Fills the bony labyrinthPerilymph
Compose the vestibuleSaccule and Utricle
Fills the membranous labyrinthEndolymph
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