Download Mouth cavity

ORAL ANATOMY
G O O D O V E R A L L H E A LT H S TA R T S W I T H
THE ORAL CAVIT Y …
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
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
a. Roof
b. Floor
c. cheek
DECIDUOUS ERUPTION CHART
PERMANENT ERUPTION CHART
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
.1
.2
Medial surface related to the floor of the mouse
.3
Deep part:
Lies deep to mylohyoid muscle .1
Related to lingual and hypoglossal nerve .2
Submandibular duct
Emerge from the anterior end of the deep part .1
Open at side of the frenulum of the tongue .2
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 (820)
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.,
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
MCQ
Which 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
A.
Lingual nerve
B.
Glossopharyngeal nerve
C.
Greater petrosal nerve
D.
Chorda tympanic nerve
All muscles of the tongue are innervated by hypoglossal nerve except-----------A.
Styloglossus muscle
B.
Palatoglossus muscle
C.
Hyoglossus muscle
D.
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
A.
Protrude
B. Retract
C. Depress
D. Alter the shape of
The genioglossus muscle-------------------- the tongue
A.
Protrude
B. Retract
C. Depress
D. Alter the shape of
The styloglossus muscle -------------------- the tongue
A.
Protrude
B. Retract
C. Depress
D. 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
A.
8
B.
16
C.
24
D.
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