temporal_and_infratemporal_2.pdf

temporal_and_infratemporal_2.pdf

• 1.
  Buccal nerve: Betweenthe upper and lower heads of lateral pterygoid Branches from Anterior trunk • Masseteric nerve: Pass laterally over the lateral pterygoid muscle and through the mandibular notch, on the deep surface of masseter M lateral pterygoid lateral to the buccinator, supply the adjacent skin and oral mucosa and the buccal gingivae of the lower molars
• 2.
  Mandibular nerve Branches from Anterior trunk •Masseteric nerve: Pass laterally over the lateral pterygoid muscle and through the mandibular notch, on the deep surface of masseter M
• 3.
  Deep temporal nerves: abovethe lateral pterygoid muscle Branches from Anterior trunk Directly to deep surface of the lateral pterygoid muscle pterygoid muscle Temporal fossa to supply the temporalis muscle •Nerve to lateral pterygoid
• 4.
  Branches from Posterior trunk Auriculotemporal nerve: between the tensor veli palatini and the upper head of lateral pterygoid muscle between the between the sphenomandibular ligament and the neck of mandible curves around the neck of mandible Supply: area of the temple, external ear, the external auditory meatus, tympanic membrane, and temporomandibular joint delivers postganglionic parasympathetic nerves from the glossopharyngeal nerve [IX] to the parotid gland
• 5.
  Branches from Posterior trunk Lingual nerve: between the tensor veli palatini and lateral pterygoid muscle joined by the chorda tympani nerve tympani nerve lateral surface of the medial pterygoid Between the posterior attachment of the mylohyoid muscle to the mylohyoid line and the attachment of the superior constrictor of the pharynx
• 6.
  Branches from Posterior trunk Lingual nerve: enters the floor of the oral cavity groove on the medial surface of the mandible immediately inferior to the last inferior to the last molar tooth At risk when operating on the molar teeth Passes into the tongue on the lateral surface of the hyoglossus muscle attached to the submandibular ganglion
• 7.
  The chorda tympaninerve Originates from the facial nerve Mastoid wall of the middle ear Passes through a small canal Separated from the tympanic membrane by the handle of malleus continues through the petrotympanic fissure, it emerges from the skull into the infratemporal fossa. It soon combines with lingual nerve Taste Anterior 2/3 of tongue Preganglionic parasympathetic fibers to submandibular ganglion
• 8.
  Lingual nerve
• 9.
  General sensation fromthe anterior two-thirds of the tongue, oral mucosa on the floor of the oral cavity, and lingual gingivae associated with the lower teeth Lingual nerve
• 10.
  Branches from Posterior trunk Inferior alveolar nerve: originates deep to the lateral pterygoid muscle between the sphenomandibular sphenomandibular ligament and ramus of mandible mandibular foramen and canal Before entering mandibular foramen, it gives nerve to mylohyoid incisive nerve mental nerve
• 11.
  Inferior alveolar nerve Motor : nerve to mylohyoid, supply mylohyoid and anterior belly of digastric Sensory: Main trunk: molars teeth and the second premolar Incisive branch: rest of lower teeth Mental nerve: mucosa and skin of the lower lip and skin of the chin
• 12.
  The tympanic plexus, andthe lesser petrosal nerve Middle cranial fossa, then through foramen ovale to auriculotemporal nerve V Tympanic canaliculus Hiatus for Lesser petrosal nerve Lesser petrosal nerve ovale to infratemporal fossa Postganglionic fibers pass to the parotid salivary gland. auriculotemporal nerve V
• 13.
  Otic ganglion: smallstellate-shaped ganglion inferior to the foramen ovale and medial to the mandibular division of the trigeminal n. lesser petrosal nerve contains mainly preganglionic parasympathetic fibers for the parotid gland
• 14.
  Maxillary artery Enter:between the neck of mandible and Three parts: 1st: between the neck of mandible and sphenomandibular ligament 2nd: related to the lateral pterygoid muscle 3rd: in the pterygopalatine fossa neck of mandible and sphenomandibular ligament Leave: through pterygomaxillary fissure
• 15.
  jugular foramen hypoglossal canal Maxillaryartery Branches from 1st part: foramen magnum Between the sphenomandibular ligament and the lateral pterygoid Between the two roots of auriculotemporal nerve Enters through the foramen spinosum Middle meningeal artery Course
• 16.
  Maxillary artery Branchesfrom 1st part: Enter the mandibular foramen Supplies all lower teeth, buccal gingivae, chin, and lower lip Gives mental artery Inferior alveolar artery