Anatomy and physiology : designed for academies and families . when the os hyoides is fixed, or depress this boneand the larynx when the sternum is fixed. When these two sets of muscles act to-gether, the larynx is projected forward. The muscles 20, 21, and 22, elevate the firstrib. PHYSIOLOGY OF THE LARYNX. In the formation of the voice, each of the portions beforedescribed performs an important part. The cricoid and thy-roid cartilages give form and stability to the organs; thearytenoid cartilages by their movement vary the width ofthe glottis. The epiglottis is flexible and elastic. When it
Anatomy and physiology : designed for academies and families . when the os hyoides is fixed, or depress this boneand the larynx when the sternum is fixed. When these two sets of muscles act to-gether, the larynx is projected forward. The muscles 20, 21, and 22, elevate the firstrib. PHYSIOLOGY OF THE LARYNX. In the formation of the voice, each of the portions beforedescribed performs an important part. The cricoid and thy-roid cartilages give form and stability to the organs; thearytenoid cartilages by their movement vary the width ofthe glottis. The epiglottis is flexible and elastic. When itis erect, the chink of the glottis is open, as in inspiration; Which cartilages give stability and form to the larynx ? Which yary thediameter of the glottis ? Whatis the function of the epiglottis ? PHYSIOLOGY OF THE LARYNX. 135 when depressed, as in swallowing food and drink, it coversand closes this aperture. This prevents the introduction ofarticles of food into the air-passages, and, probably, modifiesthe sounds as they issue from the glottis. Fig. Fie. 131. A lateral view of the tongue, larynx and upper part of the trachea. 1,A portion of the temporal bone of the left side. 2, 2, The right side of the lower jaw;the left side has been removed. The white line shows the position of the lower mar- fin of the jaw behind the muscles. 3, The tongue. 4, The genio-hvoideus muscle., The genio-hvo-glossus. 6, 7, The hvo-glossus. 8, A portion of the lingualis. 9,The stvlo-glossus. 10, The stylo-hvoideus. 11, The stylo-pharyngeus. 12, lhe os-hyoides. 13, The membrane connecting the hyoid bone with the thyroid , The thvroid cartilage. 15, The thyro-hyoideus muscle. 16, The cricoid cartil-age. 17, the membrane which connects the cricoid ajid thyroid cartilages. 18, lhetrachea. 19, The commencement of the oesophagus. The muscle 4 elevates the larynx, and draws it forward, when the under jaw afixed, or it depresses the under jaw when the larynx is fixed. The muscles 6, /
Size: 1401px × 1783px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
