USMLE · Question #615
A 30-year-old female is brought to the emergency department after being involved in a motor vehicle accident. She was not wearing a seatbelt and was ejected from her car seat upon collision with a…
The correct answer is A. lateral pterygoid muscle. The lateral pterygoid muscles consist of two heads: an upper head arising from the infratemporal surface of the greater wing of the sphenoid bone and a lower head arising from the lateral pterygoid plate. The lateral pterygoids act to pull the mandible forward in the process of…
Question
A 30-year-old female is brought to the emergency department after being involved in a motor vehicle accident. She was not wearing a seatbelt and was ejected from her car seat upon collision with a tree. Physical examination reveals several lacerations on her face and chest as well as an inability to open her mouth against resistance. The muscle which was most likely injured is the
Options
- Alateral pterygoid muscle
- Bmasseter muscle
- Cmedial pterygoid muscle
- Dorbicularis oris muscle
- Etemporalis muscle
How the community answered
(39 responses)- A72% (28)
- B15% (6)
- C5% (2)
- D3% (1)
- E5% (2)
Explanation
The lateral pterygoid muscles consist of two heads: an upper head arising from the infratemporal surface of the greater wing of the sphenoid bone and a lower head arising from the lateral pterygoid plate. The lateral pterygoids act to pull the mandible forward in the process of opening the jaw against resistance. Its other actions include protracting the mandible and moving it from side to side while chewing food.
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