Mouth cavity

MOUTH

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ORAL ANATOMYG O O D OV E R A L L H E A LT H S TA RT S

W I T H T H E O R A L C AV I T Y…

THE LIPS

Def.CoveringContentsPhiltrumLabial 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

BoundariesCommunicationLateral wallOpening of parotid duct

MOUTH PROPER

Roof of mouthFloor of mouth

FLOOR OF THE MOUTH

Frenulum of the tonguePlica fimbriataSublingual fold

MUCOUS MEMBRANE OF THE MOUTH

Is strongly attached to alveolar periosteum Sensory inervation of the moutha. Roofb.Floorc. cheek

DECIDUOUS ERUPTION CHART

PERMANENT ERUPTION CHART

THE TEETH

Permanent teeth: number and eruption

Deciduous teeth

TEETH

THE TONGUE

BLOOD SUPPLY OF TONGUE

INTRINSIC MUSCLES OF THE TONGUEALL 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 nodeAubmandibular lymph nodeDeep 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 GLANDSite: it lies in submandibular (digastric triangle)

Parts: divided into two parts by mylohyoid muscle

superficial part :Shape: wedge shape with

.1superficial surface cover by skin and fascia

.2Lateral surface related to the mandibule

.3Medial surface related to the floor of the mouse

Deep part :.4Lies deep to mylohyoid muscle

.5Related to lingual and hypoglossal nerve

Submandibular duct

.6Emerge from the anterior end of the deep part

.7Open 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 aciniSite: 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 SHEETSTRUCTURE 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 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)

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., 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

a. Opening of parotid gland duct in the vestibule of the mouth opposite the upper second molar tooth

b. Opening of submandibular duct on floor of mouth on the pilca fimbriata

c. Openings of sublingual gland open on the floor of mouth on sublingual fold

MCQWhich of the following nerves carry taste sensation from post 1/3 of the tongue

A. Lingual nerve

B. Glossopharyngeal nerve

C. Greater petrosal nerve

D. Chorda tympanic nerve

Which of the following nerves carry taste sensation from ANT 2/3of the tongue

E. Lingual nerve

F. Glossopharyngeal nerve

G. Greater petrosal nerve

H. Chorda tympanic nerve

All muscles of the tongue are innervated by hypoglossal nerve except------------

I. Styloglossus muscle

J. Palatoglossus muscle

K. Hyoglossus muscle

L. 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

A. Protrude

B. Retract

C. Depress

D. Alter the shape of

The hyoglossus muscle -------------------- the tongue

E. Protrude

F. Retract

G. Depress

H. Alter the shape of

The genioglossus muscle-------------------- the tongue

I. Protrude

J. Retract

K. Depress

L. Alter the shape of

The styloglossus muscle -------------------- the tongue

M. Protrude

N. Retract

O. Depress

P. Alter the shape of

There are -------------- deciduous teeth in each jaw

A. 5

B. 10

C. 15

D. 20

There are -------------- permanant teeth in each jaw

E. 8

F. 16

G. 24

H. 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 ------------

A. Levator palati muscle

B. Palatoglossus muscle

C. palatopharyngeal muscle

D. 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?

(a) Tensor veli palatini

(b) Palatoglossus

(c) Palatopharyngeus

(d) Levator veli palatine