Mastication (Muscles and Innervation)

Question 1

muscles of mastication are innervated by…

(general)

Answer 1

trigeminal nerve (CN5) – madibular division

Question 2

what are the boundaries of the infratemporal fossa?

Answer 2

• ramus of mandible
• maxilla
• greater wing of the sphenoid bone
• lateral pterygoid plate (of sphenoid bone)

Question 3

what are the muscles of mastication?

Answer 3

• Masseter
• Temporalis
• Lateral Pterygoid (Superior and Inferior Heads)
• Medial Pterygoid (Superficial and Deep Heads)

Question 4

Mandibular Nerve
Exits Cranial Cavity Via…

Answer 4

Foramen Ovale

Question 5

What are the 3 components of the Trigeminal Nerve?

Answer 5

• Ophthalmic Nerve (CN V1)
• Maxillary Nerve (CN V2)
• Mandibular Nerve (CN V3)

Question 6

what is the circled region?

Answer 6

infratemporal fossa

Question 7

What is #1?

Answer 7

coronoid process

Question 8

what is #2?

Answer 8

condyloid process

Question 9

what is #3?

Answer 9

head of the mandible

Question 10

what is #4?

Answer 10

neck of the mandible

Question 11

what is #5?

Answer 11

ramus of the mandible

Question 12

what is #6?

Answer 12

angle of the manible

Question 13

what is #7?

Answer 13

body of the mandible

Question 14

what is the muscle circled in red?

Answer 14

temporalis

Question 15

what is the muscle circled in blue?

Answer 15

masseter

Question 16

what are the origin and insertion of masseter?

Answer 16

origin: Zygomatic Bone (Zygomatic Arch)
insertion: Ramus of Mandible (Angle and Lateral Surface)

Question 17

what are the origin and insertion of temporalis?

Answer 17

origin: Temporal Fossa
insertion: Coronoid Process of Mandible (Apex and Medial Surface)

Question 18

what is circled in red?

Answer 18

Lateral Pterygoid Muscle
(Superior and Inferior Heads)

Question 19

what is circled in blue?

Answer 19

Medial Pterygoid Muscle
(Superficial and Deep Heads)

Question 20

what are in origin and insertion of the Lateral Pterygoid Muscle
Superior Head?

Answer 20

origin: Greater Wing of Sphenoid Bone
insertion: Region of Temporomandibular Joint, Neck of Condyloid Process of Mandible

Question 21

what are in origin and insertion of the Lateral Pterygoid Muscle
inferior head?

Answer 21

origin: Lateral Surface of Lateral Pterygoid Plate
insertion: Region of Temporomandibular Joint, Neck of Condyloid Process of Mandible

Question 22

what are in origin and insertion of the Medial Pterygoid Muscle Deep Head

Answer 22

Origin: Medial Surface of Lateral Pterygoid Plate
Insertion: Medial Surface of Mandible

Question 23

what are in origin and insertion of the Medial Pterygoid Muscle Superficial Head

Answer 23

Origin: Tuberosity of Maxilla
Insertion: Medial Surface of Mandible

Question 24

Ophthalmic Nerve (CN V1) contains what kind of innervation?

(motor or sensory?)

Answer 24

Sensory Only

Question 25

Maxillary Nerve (CN V2) contains what kind of innervation? | (motor or sensory?)

Answer 25

Sensory Only

Question 26

Mandibular Nerve (CN V3) contains what kind of innervation? | (motor or sensory?)

Answer 26

Sensory and Motor

Question 27

Ophthalmic Nerve (V1) exits the skull via...

Answer 27

Superior Orbital Fissure

Question 28

Maxillary Nerve (V2) exits the skull via...

Answer 28

Foramen Rotundum

Question 29

Mandibular Nerve (V3) exits the skull via...

Answer 29

Foramen Ovale

Question 30

the blue region is innervated by which nerve?

Answer 30

CN V1: Ophthalmic Nerve

Question 31

the green region is innervated by which nerve?

Answer 31

CN V2: Maxillary Nerve

Question 32

the yellow region is innervated by which nerve?

Answer 32

CN V3: Mandibular Nerve

Question 33

which formen is incircled?

Answer 33

Mental Foramen

Question 34

what is the unlabelled formen?

Answer 34

Mandibular Foramen

Question 35

what nerve(s) are circled in blue?

Answer 35

Muscular Branches

Question 36

what do Muscular Branches innervate?

Answer 36

- Masseter - Temporalis - Medial / Lateral Pterygoids

Question 37

what nerve(s) are circled in red?

Answer 37

Buccal Nerve

Question 38

what nerve(s) are circled in orange?

Answer 38

Inferior Alveolar Nerve

Question 39

what nerve(s) are circled in green?

Answer 39

Lingual Nerve

Question 40

what nerve(s) are circled in purple?

Answer 40

Auriculotemporal Nerve

Question 41

what nerve(s) are circled in purple?

Answer 41

Inferior Dental Plexus

Question 42

what nerve(s) are circled in blue?

Answer 42

Mental Nerve