Question
The muscle labelled in the following cross section is responsible for which movement of the jaw?
A. Protraction
B. Elevation
C. Retraction
D. Depression
Show Answer
|
Correct Answer » A
Explanation
|
|
Answer- A. Protraction
- Protraclion of jaw is carried out by the bilateral action of lateral pterygoid muscle, which is represented by star in the diagram, originating by two heads from sphenoid bone and getting inserted at anterior surface of mandibular condyle.
- “Lateral pterygoid is a short, thick muscle consisting of two parts. The upper head arises from the infratemporal surface and infratemporal crest of the greater wing of the sphenoid bone. The lower head arises from the lateral surface of the lateral pterygoid plate.
