Facial nerves Flashcards
What does the trigeminal nerve split into?
Opthalmic (V1)
maxillary (V2)
mandibular (V3)
Which of these branches has a motor function?
Mandibular
- conducts motor neurons to head and neck
Branches of the mandibular nerve
lingual nerve- tongue
inferior alveolar nerve- mandible
What does the mandibular nerve innervate
Muscles of mastication
- medial and lateral pterygoid
- masseter
- temporalis
The facial nerve is which branch
Seventh paired cranial nerve
What does the facial nerve split into?
Temporal branch Zygomatic branch Buccal branch Marginal mandibular branch Cervical *To Zanzibar By Motor Car
What is more superifical
trigeminal is more deep
Starts from higher up than the facial
Temporal
Frontal branches
cross the zygomatic arch in order to reach the temporal region
Innervates- frontalis, orbicularis oculi, corrugator supercilii
Zygomatic branch
transverse the zygomatic bone and reach the lateral angle of the orbit
Innervate- orbicularis oculi
Buccal branch
Cheek area, mouth and eyes
joins opthalimic
Innervates- orbicularis oris, quadratus labii superiorius, buccinator, zygomatic major/minor (deep also supply buccinator)
Marginal/ mandibular branch
under the anguli oris and platysma and supplies the chin and lower lip
innervates- mentalis
Cervical branch
Innervates- platysma
What supplies the muscles of mastication?
Maxillary
What are the branches of the external Carotid artery
Superior thyroid artery ascending pharyngeal arter Lingual artery Facial artery Occipital artery Posterior auricular artery Maxillary arter Superfical temporal artery *Some anatomists like freaking out poor medical students
What supplies blood to the masseter?
Branch of maxillary -Inferior alveolar artery
Temporalis vascularization
Maxillary artery
Lateral and Medial pterygoid
- Middle meningeal artery
- external carotid
Buccinator blood supply
Internal carotid
Tooth extraction what does the dentist do? and how does the dentist know If this is successful?
the dentist will anaesthetise the inferior alveolar nerve right at the back of the mouth before it enters the mandibular foramen.
TMJ joint 3 surfaces
mandibular fossa
articular tubercle
mandibular head
What is the mechanism of the joint?
The bone surfaces never come in contact with each other
separated by articular disk
splits the 2 synovial joint cavities
articular surface are covered by fibrocartilage
Ligaments of the TMJ
- lateral ligament- thickens to prevent joint dislocation
- Sphenomandibular ligament – originates from the sphenoid spine, and attaches to the mandible.
- Stylomandibular ligament- supports weight of jaw
Movements of the jaw
Protrusion- lateral pterygoid
Retraction- temporalis
Elevation- masseter
depression- medial pterygoif
Blood supply to the TMJ
external carotid
superficial temporal branch
Nerve supply to the TMJ
Mandibular nerve
