new_n_lost
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Contraction of which of the following muscles contributes most to the backward movement of the lower jaw during the process of mastication?
A. Digastric
B. Lateral pterygoid
C. Medial pterygoid
D. Mylohyoid
E. Temporalis
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| P4a99
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B or C.
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| new_n_lost
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One Choice In under 10 secs >> The Idea is to get soem easy questions and fact ingrained that even in a dead tired state the reflex seem to work and choose the correct answer.
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| P4a99
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Oh wait, what was i thinking !!?
Digastric= elevates hyoid bone, im not sure what it does to the mandible, probably pulls it down.
Pterygoids= pull forwards, elevate, rotation
Temporalis, some of the fibers help in retracting the mandible the other fibers elevate it.
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| mytime
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E.
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| Jackofknives
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yes E
To give a quick overview
Diagastric - stabilizer
Lateral pterygoid - elevate mandible
Medial pterygoid - protrusion
Mylohyoid - tension for lower jaw, its used mainly for swallowing, i.e. elevation of the tongue
Temporal - most powerful jaw muscle, has fan shaped fibres radiation originating from pars squamosa os temporal, inserting on the proc. coranoideus of the mandible. so its main function is elevation, and retraction of mandible.
Edited by Jackofknives on 08/25/07 - 12:19 AM
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| GoodGirl
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Temporalis
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| new_n_lost
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mytime wrote:
E.
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| new_n_lost
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The correct answer is E.
Mastication is a complex process involving alternating elevation, depression, forward movement, and backward movement of the lower jaw. The backward movement step is accomplished by the posterior fibers of the temporalis muscle.
The digastric (choice A) helps to depress the lower jaw during chewing.
The lateral pterygoid (choice B) helps to move the lower jaw forward during chewing.
The medial pterygoid (choice C) helps to elevate the lower jaw during chewing.
The mylohyoid (choice D) helps to depress the lower jaw during chewing.
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| shwe
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Another good one . Thanks NnL .
GL
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