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Mandible, temperomandibular joint & muscle of mastication
(M.C.Qs.)
By
Prof. Samir Malik
Dental students
M.C.Qs.
The muscles attache to the both surface of the mandible are one of the
following?
A-5 muscles.
B-6 muscles.
C-7 muscles.
D-9 muscles.
Answer:
The muscles attache to the both surface of the mandible are one of the
following?
A-5 muscles.
B-6 muscles.
C-7 muscles.
D-9 muscles.
Short account:
Mention four muscles attached to the mandible &their nerve supply?
Answer
platysma
Mentalis
Buccinator
Temporalis
n.supply: facial nerve.
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Trigeminal nerve.
M.C.Qs.
The condylar process of the mandible showing all the following are true
except one sentence is wrong?
A-neck.
B-pterygoid fovea.
C-Head
D-shaft.
Answer
The condylar process of the mandible showing all the following are true
except one sentence is wrong?
A-neck.
B-pterygoid fovea.
C-Head
D-shaft.
Mention the nerve related to the mandible?
Answer :
Lingual nerve
Inferior alveolar nerve
Nerve to mylohyoid
Mental nerve.
Mandibular branches of facial nerve..
Auriculotemperal nerve.
Two glands: submandibular& Sublingual.
Two muscles: platysma & anterior belly of the digastric.
Mention two structure above or superior to diaphragma oris & two
below?
Answer:
Above
genohyoid muscle
sublingual gland
below;
anterior belly of the digastric muscle& submandibular gland
The temporal fossa above zygomatic arch?
A-true
B-false.
The infratemporal fossa above the zygomatic arch?
A-true
B-false
Answer
The temporal fossa above zygomatic arch?
A-true
B-false.
The infratemporal fossa above the zygomatic arch?
A-true
B-false
What are the ligaments of the temperomandibular joint?
Answer:
1-stylomandibular ligament.
2-Sphenomandibular ligament
3-temperomandibular ligament
M.C.Qs
Which structure dividing the temperomandibular joint into two cavities;
upper &lower?
A-intrarticular disc.
B-tendon.
C-ligaments
D-menisci.
Answer:
Which structure dividing the temperomandibular joint into two cavities;
upper &lower?
A-intrarticular disc.
B-tendon.
C-ligaments
D-menisci.
M.C.Qs.
The mental foramen of the mandible in the extremity of the age lying
near?
A-alveolar process
B-lower border
c-near the ramus
d-near the symphysis menti
Answer
The mental foramen of the mandible in the extremity of the age lying
near?
A-alveolar process
B-lower border
c-near the ramus
d-near the symphysis menti
M.C.Qs.
The elevation of the temperomandibular joint (T.M.J.) is done by the
following muscle except one muscle doesnot charing in elevation?
A-Temporalis Muscle .
B-Masseter muscle .
C-Medial pterygoid muscle
D-Auricularis superior muscle
Answer:
The elevation of the temperomandibular joint (T.M.J.) is done by the
following muscle except one muscle doesnot charing in elevation?
A-Temporalis Muscle .
B-Masseter muscle .
C-Medial pterygoid muscle
D-Auricularis superior muscle
M.C.Qs.
The protrusion of the mandible is caused by one of the following ?
A-lateral pterygoid muscle assisted by medial pterygoid .
B- posterior belly of digastric muscle & stlyohyoid muscle.
C-orbicularis oris & mentalis muscle
D-mylohyoid & genohyoid
Answer.
The protrusion of the mandible is caused by one of the following ?
A-lateral pterygoid muscle assisted by medial pterygoid .
B- posterior belly of digastric muscle & stlyohyoid muscle.
C-orbicularis oris & mentalis muscle
D-mylohyoid & genohyoid
M.C.Qs.
The depression of the mandible is done by the following factor except
one is wrong?
A-Gravity.
B-mylohyoid & genohyoid muscles.
C-masseter muscle.
D-Digastric muscle
Answer:
The depression of the mandible is done by the following factor except
one is wrong?
A-Gravity.
B-mylohyoid & genohyoid muscles.
C-masseter muscle.
D-Digastric muscle
retromoandibular
fossa
pterygopalatine
fossa
• 2- Masseter :
origin inner surface &lower border of
zygomatic arch.
Insertion outer surface of ramus .
Nerve supply:massetric n.(first branchial
arch)
1-TEMPRALIS MUSCLE
• Origin temporal fossa ,fascia & inbetween
2 temporal lines
• Insertion: cronoid process
• Nerve supply from deep temporal nerves;
1st branchial arch.
4-MEDIAL PTRYGOID
• Origin:deep head inner surface of lateral
(medial) ptrygopid plate
• Superficial head: tuberosity of maxilla
• Insertion :inner surface of angle of
mandible; 1st pharyngeal arch.
3-LATERAL PTRYGOID
• Origin:upper head infratemporal surface of
greater wing of the sphenoid bone.
• lower head outer surface of lateral ptrygoid
plate.
• Insertion: neck of the condyle ,ptrygoid
fovea & capsule of TMJ.
• Nerve supply from mandibular nerve.
The infratemporal fossa- The mandibular nerve
The infratemporal fossa- The mandibular nerve
Mandibular Nerve
•The largest division of the trigeminal nerve
•A mixed nerve, sensory and motor root
•leave through the Foramen Ovale
•Below the foramen ovale, the 2 roots unite to form the trunk of the nerve
Lesser
•Divides into anterior & posterior divisions
petrosal n.
•The ant. is mainly motor
Nervus
•The post. is mainly sensory
spinosus
Tensor tympani
Motor & sensory roots
of mandibular n
Otic ganglion
Tensor palati
Lingual n.
Auriculotemporal n.
Chorda tympani
Inferior alveolar n.
Branches:
Mylohoid nerve
From the trunk:
• Nerve to medial pterygoid (motor):
supply the tensor palati and tensor tympani ms & medial pterygoid
• Nervus spinosus (sensory) for meninges
Passes through Foramen spinosum into the cranial cavity
Medial pterygoid
Ant. Division:
Deep temporal
nerves
3 motor branches for muscles of
mastications
• Deep temporal nerves (temporalis ms)
• Nerve to masseter
• Nerve to lateral pterygoid
Auriculotemporal
nerve
Inferior alveolar
nerve
Lingual
nerve
one sensory branch
• Buccal nerve (sensory): supplies skin over
the buccinator, and mucosal lining of
buccinator ms.
Buccal nerve
Posterior division:
Deep temporal
nerves
sensory branches
1.Auriculotemporal nerve
• arises by 2 roots (which embrace the middle
meningeal artery) and passes backwards deep to
the neck of the mandible
• supplies the scalp
• sensory the parotid gland and carries
postganglionic parasympathetic to the parotid
gland
Auriculotemporal
nerve
2. Lingual nerve
Inferior alveolar
nerve
Lingual
nerve
• Joined by the chorda tympani
• Carries general sensations from the anterior 2/3 of
the tongue
• The chorda tympani carries taste sensations from
the anterior 2/3 of the tongue and preganglionic
parasympathetic fibres to the submandibular and
sublingual glands
Buccal nerve
3. Inferior alveolar nerve
• Runs behind the lingual nerve to reach mandibular foramen
• The inferior alveolar nerve continues through mandibular canal and divides into
mental and incisive branches
• The mental branch comes out of the mental foramen to supply skin of the chin
• Before it passes through the mandibular foramen it gives the mylohyoid nerve
(motor)
• The mylohyoid nerve supplies the mylohyoid muscle and anterior belly of digastric
Inferior alveolar
nerve
Lingual nerve
Mylohoid nerve
& vessels
Mylohoid m.
Mandibular Nerve
•deep temporal (dt)
• auriculotemporal (at)
•inferior alveolar (ia)
•nerve to the mylohyoid
(nmh)
•lingual (l)
•buccal (b)
The infratemporal fossa- The chorda tympani
Recall of relevant structures
Muscles of the masticatory apparatus
pterygoid muscles, medial and lateral
temporalis muscle
masseter muscle
Muscle of mastication
temporalis
masseter
medial pterygoid &lateral pterygoid
Highlight
• Temporalis superficial temporal vessels
auricular temporal nerve
NBP
• Masseter parotid
parotid duct
• Medial ptrygoid
lingual&inferior
alveolar nerves
• Lateral ptrygoid
parts of maxillary
artery
Highlight
• The disc is avascular in the centre so ,the
regenerative power is low.
• The disc is composed of dense collagen
fibers only in its centre but in posterior &
anterior ends it contains elastic fibers
• Synovial membrane has 3 types of cells
:type A(fibroblast like cell) ,type
B(macrophage like ) and intermediate cell.
• The disc having two nodules