33Submandibular salivary gland Site: it lies in submandibular (digastric triangle)Parts: divided into two parts by mylohyoid musclesuperficial part:Shape: wedge shape withsuperficial surface cover by skin and fasciaLateral surface related to the mandibuleMedial surface related to the floor of the mouseDeep part:Lies deep to mylohyoid muscleRelated to lingual and hypoglossal nerveSubmandibular ductEmerge from the anterior end of the deep partOpen at side of the frenulum of the tongue
34Sublingual salivary glangs Is the smallest of the three main salivary glands It has both serous and mucous acini Site: related to sublingual fossa of mandibular under cover of mucous membrane of the mouth (sublingual fold) Ducts: open into the floor of the mouse (8- 20)
49Work sheet Structure inside parotid gland A) Auriculo-temporal n. b) Ext. carotid a → divides (behind the neck of mandible) into maxillary and superficial temporal arteries c) Retromandibular v. d) Facial n.→ divides into 5 terminal brs. e) Deep parotid L.Ns.
50Nerves of the glandParasympathetic (secretomotor): The preganglionic fs. reach the otic ganglion from the lesser petrosal n. (br. from the glossopharyngeal n.) The postganglionic fs. Arising from the otic ganglion and Carried to the gland by the auriculo-temporal n.
51Important questionsSensory innervation of the mouth Roof: The greater palatine and nasopalatine nerves from the maxillary division of the trigeminal nerve Floor: The lingual nerve (common sensation), a branch of the mandibular division of the trigeminal nerve. The taste fibers travel in the chorda tympani nerve, a branch of the facial nerve. Cheek: The buccal nerve, a branch of the mandibular division of the trigeminal nerve (the buccinator muscle is innervated by the buccal branch of the facial nerve)
52Sensory innervation of the tongue Anterior two thirds: Lingual nerve branch of mandibular division of trigeminal nerve (general sensation) and chorda tympani branch of the facial nerve (taste) Posterior third: Glossopharyngeal nerve (general sensation and taste)
53Sensory innervation of the teeth A. the upper teeth: supplied by ant Sensory innervation of the teeth A. the upper teeth: supplied by ant., middle, post. Superior alveolar nerves which are branches from maxillary division of trigeminal nerve. B. the lower teeth: supplied by inferior alveolar nerve which are branches from post. Division of mandibullar division of trigeminal nerve
54Mention sites of salivary glands openings Opening of parotid gland duct in the vestibule of the mouth opposite the upper second molar toothOpening of submandibular duct on floor of mouth on the pilca fimbriataOpenings of sublingual gland open on the floor of mouth on sublingual fold
55MCQWhich of the following nerves carry taste sensation from post 1/3 of the tongueLingual nerveGlossopharyngeal nerveGreater petrosal nerveChorda tympanic nerveWhich of the following nerves carry taste sensation from ANT 2/3of the tongueAll muscles of the tongue are innervated by hypoglossal nerve exceptStyloglossus musclePalatoglossus muscleHyoglossus muscleIntrinsic musclesA patient is unable to taste a piece of sugar placed on the anterior part of the tongue. Which cranial nerve is likely to have a lesion?(a) Hypoglossal(b) Vagus(c) Glossopharyngeal(d) Facial
56The intrinsic muscles of the tongue -------------------- the tongue ProtrudeRetractDepressAlter the shape ofThe hyoglossus muscle the tongueThe genioglossus muscle the tongueThe styloglossus muscle the tongue
57There are -------------- deciduous teeth in each jaw 5101520There are permanant teeth in each jaw8162432The following facts concerning the tongue are correct except which?(a) The intrinsic muscles are innervated by the hypoglossal nerve.(b) The posterior third of the tongue forms part of the anterior wall of the oral pharynx.(c) Lymphoid tissue is found on the posterior third of the dorsum of the tongue.(d) On either side of the frenulum of the tongue are situated the openings of the parotid ducts.
58The following statements concerning the submandibular salivary gland are correct except which? (a) The facial nerve passes through it(b) The secretomotor nerve supply is derived from the facial nerve.(c) The submandibular duct opens into the floor of the mouth.(d) Has same parasympathetic nerve supply like sublingual glandWhich of the following muscles form the palatine aponeurosis?(a) Tensor veli palatini(b) Palatoglossus(c) Palatopharyngeus(d) Levator veli palatineAll muscles of the soft palate are innervated by pharyngeal plexus (cranial accessory nerve) exceptLevator palati musclePalatoglossus musclepalatopharyngeal muscletensor palati muscle
59The following statements concerning the parotid salivary gland are correct except which? (a) The facial nerve passes through it (b) The secretomotor nerve supply is derived from the facial nerve. (c) The parotid duct pierces the buccinator muscle and opens into the mouth. (d) The external carotid artery divides within its substance Which of the following muscles elevates the soft palate during swallowing? (a) Tensor veli palatini (b) Palatoglossus (c) Palatopharyngeus (d) Levator veli palatini (e) Salpingopharyngeus Which of the following muscles tense the soft palate? (d) Levator veli palatine