• Register
Prepare for your medical exam, USMLE, MCCEE with a FREE MCQs and clinical cases! ECG, CXR and all types of free medical MCQs with answers, good luck! Medical MCQs from students to students.
Sidebar

What is the function of lateral pterygoid muscle?

1.5K views
asked Apr 4, 2017 in Anatomy by Rajesh Bahara
A 34-year-old man injures his lateral pterygoid muscle. Which of the following activities will be adversely affected by this injury?
(A) Closing the jaw
(B) Smiling
(C) Swallowing
(D) Whistling
(E) Yawning

1 Answer

0 votes
 
Best answer
(E) Yawning
The muscles involved in jaw movement are fourfold: lateral pterygoid, masseter, temporalis, and medial pterygoid. The lateral pterygoid opens the jaw while the other three close the jaw. All four are innervated by the trigeminal nerve (V3). One can remember this with the mnemonic “M’s Munch” and “Lateral Lowers.” Yawning would be impaired with a lateral pterygoid injury.

Answer A is incorrect. Closing the mouth is performed by the masseter, temporalis, and medial pterygoid.
Answer B is incorrect. Smiling requires the function of many facial muscles, including the zygomaticus major.
Answer C is incorrect. Swallowing is mediated by the pharynx and the tongue.
Answer D is incorrect. Whistling is mediated by the tongue and facial muscles, such as the buccinator and orbicularis oris.
answered Apr 4, 2017 by Rajesh Bahara

Related questions

2 answers 4.9K views
4,924 views asked Feb 10, 2014 in Anatomy by Rajesh Bahara
1 answer 2.7K views
2,700 views asked Mar 30, 2014 in Histology by anonymous
1 answer 18.9K views
1 answer 2.4K views
1 answer 2.0K views

...