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Enrol Now — Buy CourseQUESTION 1 OF 10
Which nerve supplies the motor fibres to the posterior belly of the digastric muscle?
Correct answer: A
The posterior belly of the digastric muscle is derived from the second pharyngeal arch and is innervated by the facial nerve (CN VII). The anterior belly, by contrast, is innervated by the mandibular division of the trigeminal nerve (V3).
QUESTION 2 OF 10
The motor supply to the masseter, temporalis, medial and lateral pterygoid muscles and the anterior belly of digastric is provided by which nerve?
Correct answer: B
All primary muscles of mastication (masseter, temporalis, medial pterygoid, lateral pterygoid) are innervated by the mandibular division of CN V. The anterior belly of digastric is also innervated by V3 via the mylohyoid nerve.
QUESTION 3 OF 10
Which of the following is NOT a muscle of mastication?
Correct answer: D
The buccinator is a muscle of facial expression, innervated by the buccal branch of the facial nerve (CN VII). It compresses the cheek but does not move the mandible, unlike the masseter, temporalis, and pterygoids.
QUESTION 4 OF 10
Which describes the typical origin and insertion of the masseter muscle?
Correct answer: A
The masseter originates from the zygomatic arch and inserts on the angle and lateral ramus of the mandible, enabling powerful elevation of the mandible.
QUESTION 5 OF 10
Which of the following muscles are primarily responsible for elevating the mandible? (Select all that apply)
Correct answer: C
The masseter and temporalis are primary elevators of the mandible. The lateral pterygoid protrudes and depresses the mandible, while the anterior digastric depresses the hyoid and mandible.
QUESTION 6 OF 10
Where does the temporalis muscle originate and insert?
Correct answer: B
The temporalis arises from the temporal fossa and inserts on the coronoid process and anterior ramus, allowing elevation and retraction of the mandible.
QUESTION 7 OF 10
A lesion of the mandibular division of the trigeminal nerve (CN V3) would result in paralysis of all the following muscles EXCEPT:
Correct answer: D
CN V3 innervates the masseter, temporalis, and anterior belly of digastric. The posterior belly of digastric is innervated by CN VII (facial nerve), so it is spared in an isolated V3 lesion.
QUESTION 8 OF 10
A patient presents with unilateral paralysis of the muscles of mastication and loss of general sensation from the mandibular teeth and lower lip. These combined motor and sensory deficits are most likely due to a lesion affecting which nerve?
Correct answer: B
V3 carries motor fibers to muscles of mastication and sensory fibers from the lower lip, mandibular teeth, and chin. A lesion here causes both motor paralysis and sensory loss in that distribution.
QUESTION 9 OF 10
A patient suffers a comminuted fracture of the zygomaticomaxillary complex (ZMC) with a displaced fracture of the zygomatic arch. Dysfunction of which muscle, due to its disrupted origin, is the primary cause of this masticatory difficulty?
Correct answer: C
The masseter originates from the zygomatic arch. A displaced fracture disrupts its origin, impairing jaw elevation and causing pain during chewing.
QUESTION 10 OF 10
A patient with atrophy of the temporalis complains of reduced bite strength when closing the mouth. Which function is most likely impaired?
Correct answer: B
The temporalis is a powerful elevator of the mandible. Atrophy reduces jaw-closing force.
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