Anatomy MCQ Answer 009

The correct Answer is a,b


BUCCINATOR, is the most deeply located facial muscle forming the muscular foundation of the cheek. During mastication, the buccinator in conjunction with the tongue, places the food between the upper and lower teeth for grinding. In addition, since its most anterior muscular fibres extend into the upper and lower lips, the action of the muscle (in conjunction with that of the orbicularis oris), not only closes the mouth, but pressed the lips back upon the teeth, pulls the angle of the mouth laterally and flattens the cheek.

It arises from the outer surfaces of the alveolar processes of the maxilla and mandible, corresponding to the three molar teeth; and behind, from the anterior border of the pterygomandibular raphé which separates it from the superior constrictor of the pharynx.

The PAROTID DUCT (excretory) emerges from its (parotid glands) superficial portion, courses medially contacting the anterior border of the masseter muscle and the buccal fat pad, then, passes deeply through the buccinator muscle to open into the oral cavity opposite the second maxillary molar tooth.

Motor innervation is from the facial nerve (cranial nerve VII), and sensory innervation is from the buccal branch of the trigeminal nerve (cranial nerve V).

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