. Human physiology. milar in J Surrounded by ; labyrinth ) Contains endolymph. Otoliths and hair-like Terminal fibres of auditory nerve. Pinna. Auditory and Path of the Sound Waves 222 ELEMENTARY PHYSIOLOGY QUESTIONS ON LESSON XXXVI. 1. Describe the structure of the outer ear, and explain the uses of its parts. 2. What is the drum of the ear ? Persons are sometimes rendered permanently deaf by a violent explosion. Explain how this happens. 3. Describe the arrangement and uses
. Human physiology. milar in J Surrounded by ; labyrinth ) Contains endolymph. Otoliths and hair-like Terminal fibres of auditory nerve. Pinna. Auditory and Path of the Sound Waves 222 ELEMENTARY PHYSIOLOGY QUESTIONS ON LESSON XXXVI. 1. Describe the structure of the outer ear, and explain the uses of its parts. 2. What is the drum of the ear ? Persons are sometimes rendered permanently deaf by a violent explosion. Explain how this happens. 3. Describe the arrangement and uses of the parts of the middle ear. 4. Write what you know about the structure and functions of the inner ear. 5. A person may be deaf although the ear is perfect in all its parts. Explain this. 6. In what way does a vibrating body produce the sensation of hearing ? LESSON VOICE. The organ of voice is the larynx, which is a modification of theupper portion of the trachea. It consists of a cartilaginous frame-. Fig. 213.—Front view of the Larynx. 1, hyoid bone ; 2, thyroid cartilage; 3, cricoid ; 4, first cartilaginous ring of the trachea ; 5, membrane ; 6, ligaments work, the parts of which are movable on each other, the motionbeing produced by the contraction of various muscles. The THE VOICE 223 thyroid and cricoid cartilages have already been described (seep. 140). The highest (posterior) portion of the cricoid is surmountedby two pyramidal cartilages called the arytenoid form movable joints with the cricoid, to which they areheld by ligaments. They must also necessarily accompany thecricoid cartilage in all its movements. The arytenoid cartilages are connected with the interior surfaceof the front part of the thyroid cartilage by means of two bands of
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