![]() ![]() So, when the nasal cavity cannot function properly, like in case of a blocked nose, the oral cavity serves as the pathway for air, and leads it into the airways through the pharynx. Though not a primary part of the human respiratory system, its functions include serving as the secondary passage for air to enter and exit the respiratory tract during inhalation and exhalation. Oral Cavity Functions What Does the Oral Cavity Do in the Respiratory System The buccinator muscle forms the cheeks, while the mandible, hyoid bone, pharynx and the styloid processes provide muscle attachment to the tongue, and the oral cavity floor. The lips are controlled by the orbicularis oris muscle, which also play a major role in controlling facial expressions. The mandibular and maxillary bones constitute its basic bone structure. Ĭhorda tympani, a facial nerve branch, supply the tongue with special sensory fibers so it could detect different tastes. The lingual branch of the mandibular nerve (another trigeminal nerve branch) provides the sensory innervation to the oral cavity floor, while its buccal branch supplies the cheeks. Another maxillary branch, the lesser palatine nerve supplies the soft palate. The maxillary nerve, one of the three trigeminal nerve branches, innervates the hard palate through its two branches, the nasopalatine and greater palatine nerves. The oral cavity is innervated by the trigeminal nerve (CN V), which divides into multiple branches to supply to its different parts. Minor salivary gland pairs opening in the mouth include the labial, buccal, palatal and lingual glands, all of which assist in chewing. The vestibule area receives the secretion from the parotid glands, while the submandibular and sublingual glands open into the oral cavity proper. There are three major paired salivary glands: the parotid, submandibular (submaxillary), and sublingual glands. Oral Cavity Anatomy Diagram Salivary Glands
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