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Title

Articulation-Jaw

Writer

Acuworld

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626

Date

2020-07-15 09:09:11

<H1>Articulation</H1>
So far on our journey we have learned how the airstream is created (respiration), how it sets the vocal folds into action, creating a buzz (phonation), and that buzz is modified by the airspace above the larynx (resonation). Now we will explore how the air and vibration passing through the vocal tract are shaped by the articulators into speech sounds.
<DL>
There are two major types of articulators: 
<DT>Moveable articulators 
<DD>
are structures that can move and allow us to shape the sound, i.e. the jaw, the lips and other facial muscles, the tongue, the soft palate, and the pharynx; 
<DT>Fixed articulators 
<DD>
are those that cannot be moved by muscles, namely the hard palate and the teeth. </DD></DL>
<A name=jaw>The Jaw</A> <A href="http://www.yorku.ca/earmstro/journey/images/mandible.jpg" target=Anatomy><IMG height=90 src="http://www.yorku.ca/earmstro/journey/images/mandiblem.jpg" width=140 align=left border=0> </A>The Jaw bone or Mandible, viewed here from the front, hangs off the skull suspended by a sling formed of muscles attached to the ramus of each side of the bone. The ramus is the vertical part of the mandible. The Masseter muscle, forms the sling on the outside of the ramus; the lateral and medial pterygoid muscles on the inside. The masseter can be felt by placing a hand just in front of you ear and then clenching your jaw. To feel the pterygoids, you must place your fingers inside your mouth - be careful not to bite your fingers as you contract your jaw muscles! 
<A href="http://www.yorku.ca/earmstro/journey/images/mandibleside.jpg" target=Anatomy><IMG height=90 src="http://www.yorku.ca/earmstro/journey/images/mandiblesidem.jpg" width=140 align=left border=0></A> From the side, one can see the shape of the ramus a bit more clearly (this is the inside of the right half of the mandible). The lateral pterygoid will attach to the inside to the condyle, the bump at the top back of the mandible and to the skull just under the cheekbone. Its contraction pulls the jaw forward. The medial pterygoid muscle attaches to the bottom corner of th mandible and connects to the skull up behind the upper molars at back of the mouth. 
<DIV><A href="http://www.yorku.ca/earmstro/journey/images/mandibletop.jpg" target=Anatomy><IMG height=129 src="http://www.yorku.ca/earmstro/journey/images/mandibletopm.jpg" width=140 align=left border=0></A> From above, you can see how thick the condyle of the mandible is. This hooks into the capsule of the jaw hinge and works in a very subtle manner to rotate and drop as the jaw opens. The narrowness of the ramus allows plenty of space for the masseter on the outside and the pterygoids on the inside. </DIV>
<DIV> </DIV>
<DIV>Reference: www.yorku.ca</DIV>