Mastication (Muscles and Innervation) Flashcards
muscles of mastication are innervated by…
(general)
trigeminal nerve (CN5) – madibular division
what are the boundaries of the infratemporal fossa?
- ramus of mandible
- maxilla
- greater wing of the sphenoid bone
- lateral pterygoid plate (of sphenoid bone)
what are the muscles of mastication?
- Masseter
- Temporalis
- Lateral Pterygoid (Superior and Inferior Heads)
- Medial Pterygoid (Superficial and Deep Heads)
Mandibular Nerve
Exits Cranial Cavity Via…
Foramen Ovale
What are the 3 components of the Trigeminal Nerve?
- Ophthalmic Nerve (CN V1)
- Maxillary Nerve (CN V2)
- Mandibular Nerve (CN V3)
what is the circled region?
infratemporal fossa
What is #1?
coronoid process
what is #2?
condyloid process
what is #3?
head of the mandible
what is #4?
neck of the mandible
what is #5?
ramus of the mandible
what is #6?
angle of the manible
what is #7?
body of the mandible
what is the muscle circled in red?
temporalis
what is the muscle circled in blue?
masseter
what are the origin and insertion of masseter?
origin: Zygomatic Bone (Zygomatic Arch)
insertion: Ramus of Mandible (Angle and Lateral Surface)
what are the origin and insertion of temporalis?
origin: Temporal Fossa
insertion: Coronoid Process of Mandible (Apex and Medial Surface)
what is circled in red?
Lateral Pterygoid Muscle
(Superior and Inferior Heads)
what is circled in blue?
Medial Pterygoid Muscle
(Superficial and Deep Heads)
what are in origin and insertion of the Lateral Pterygoid Muscle
Superior Head?
origin: Greater Wing of Sphenoid Bone
insertion: Region of Temporomandibular Joint, Neck of Condyloid Process of Mandible
what are in origin and insertion of the Lateral Pterygoid Muscle
inferior head?
origin: Lateral Surface of Lateral Pterygoid Plate
insertion: Region of Temporomandibular Joint, Neck of Condyloid Process of Mandible
what are in origin and insertion of the Medial Pterygoid Muscle Deep Head
Origin: Medial Surface of Lateral Pterygoid Plate
Insertion: Medial Surface of Mandible
what are in origin and insertion of the Medial Pterygoid Muscle Superficial Head
Origin: Tuberosity of Maxilla
Insertion: Medial Surface of Mandible
Ophthalmic Nerve (CN V1) contains what kind of innervation?
(motor or sensory?)
Sensory Only
Maxillary Nerve (CN V2) contains what kind of innervation?
(motor or sensory?)
Sensory Only
Mandibular Nerve (CN V3) contains what kind of innervation?
(motor or sensory?)
Sensory and Motor
Ophthalmic Nerve (V1) exits the skull via…
Superior Orbital Fissure
Maxillary Nerve (V2) exits the skull via…
Foramen Rotundum
Mandibular Nerve (V3) exits the skull via…
Foramen Ovale
the blue region is innervated by which nerve?
CN V1: Ophthalmic Nerve
the green region is innervated by which nerve?
CN V2: Maxillary Nerve
the yellow region is innervated by which nerve?
CN V3: Mandibular Nerve
which formen is incircled?
Mental Foramen
what is the unlabelled formen?
Mandibular Foramen
what nerve(s) are circled in blue?
Muscular Branches
what do Muscular Branches innervate?
- Masseter
- Temporalis
- Medial / Lateral Pterygoids
what nerve(s) are circled in red?
Buccal Nerve
what nerve(s) are circled in orange?
Inferior Alveolar Nerve
what nerve(s) are circled in green?
Lingual Nerve
what nerve(s) are circled in purple?
Auriculotemporal Nerve
what nerve(s) are circled in purple?
Inferior Dental Plexus
what nerve(s) are circled in blue?
Mental Nerve
