Mouth cavity Dr.ayat eldomouky

Good overall health starts with the oral cavity… oral Anatomy Good overall health starts with the oral cavity… Presented by: Jessica Fuchs

The lips Def. Covering Contents Philtrum Labial frenulae

The mouth cavity: 1-extention 2-the oropharyngeal isthmus 3-division

Division of The mouth cavity: a-vestibule b- mouth proper

Vestibule of the mouth Boundaries Communication Lateral wall Opening of parotid duct

Mouth proper Roof of mouth Floor of mouth

Frenulum of the tongue Plica fimbriata Sublingual fold Floor of the mouth Frenulum of the tongue Plica fimbriata Sublingual fold

Mucous membrane of the mouth Is strongly attached to alveolar periosteum Sensory inervation of the mouth Roof Floor cheek

Deciduous Eruption Chart Presented by: Jessica Fuchs

Permanent Eruption Chart Presented by: Jessica Fuchs

Permanent teeth: number and eruption The teeth Deciduous teeth Permanent teeth: number and eruption

teeth

The tongue

Blood supply of tongue

Intrinsic muscles of the tongue all muscles of the tongue are innervated by hypoglossal nerve except palatoglossus innervated by cranial root of accessory nerve.

Extrinsic Muscles of the tongue

Genioglossus muscle

Hyoglossus, Styloglossus, palatpglossus

Lymph drainage Submental lymph node Aubmandibular lymph node Deep cervical lymph node

Sensory inervation

The palate Hard palate soft palate

The hard palate

uvula

Palatine aponeurosis

Muscles of soft palate

Musculus uvulae

Nerve supply

Blood supply

Palatoglossus and palatopharyngeal folds

Submandibular salivary gland Site: it lies in submandibular (digastric triangle) Parts: divided into two parts by mylohyoid muscle superficial part: Shape: wedge shape with superficial surface cover by skin and fascia Lateral surface related to the mandibule Medial surface related to the floor of the mouse Deep part: Lies deep to mylohyoid muscle Related to lingual and hypoglossal nerve Submandibular duct Emerge from the anterior end of the deep part Open at side of the frenulum of the tongue

Sublingual 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)

Site: superficial surface

Parts: surface of superficial part

Parts: deep part

duct

opening

Nerve supply

PAROTID GLAND Definition Shape site

Surfaces and Ralation of parotid gland

Structure inside parotid gland

Parotid gland and facial nerve

Parotid duct

Work 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.

Nerves of the gland Parasympathetic (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.

Important questions Sensory 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)

Sensory 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)

Sensory 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

Mention sites of salivary glands openings Opening of parotid gland duct in the vestibule of the mouth opposite the upper second molar tooth Opening of submandibular duct on floor of mouth on the pilca fimbriata Openings of sublingual gland open on the floor of mouth on sublingual fold

MCQ Which of the following nerves carry taste sensation from post 1/3 of the tongue Lingual nerve Glossopharyngeal nerve Greater petrosal nerve Chorda tympanic nerve Which of the following nerves carry taste sensation from ANT 2/3of the tongue All muscles of the tongue are innervated by hypoglossal nerve except------------ Styloglossus muscle Palatoglossus muscle Hyoglossus muscle Intrinsic muscles A 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

The intrinsic muscles of the tongue -------------------- the tongue Protrude Retract Depress Alter the shape of The hyoglossus muscle -------------------- the tongue The genioglossus muscle-------------------- the tongue The styloglossus muscle -------------------- the tongue

There are -------------- deciduous teeth in each jaw 5 10 15 20 There are -------------- permanant teeth in each jaw 8 16 24 32 The 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.

The 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 gland   Which of the following muscles form the palatine aponeurosis? (a) Tensor veli palatini (b) Palatoglossus (c) Palatopharyngeus (d) Levator veli palatine All muscles of the soft palate are innervated by pharyngeal plexus (cranial accessory nerve) except ------------ Levator palati muscle Palatoglossus muscle palatopharyngeal muscle tensor palati muscle

The 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