Flashcards in Infratemporal region Deck (17):
What muscles of mastication are found in the infratemporal fossa?
Lower part of temporalis, lateral and medial pterygoid muscles
What is found in the infratemporal fossa?
Lower part of temporalis, medial and lateral pterygoid muscles, maxillary artery, pterygoid venous plexus, mandibular and chorda tympani nerves and the otic ganglion
What innervates the muscles of mastication?
Name the muscles involved in depression of the temporomandibular joint
Lateral pterygoid, suprahyoid and infrahyoid
Name the muscles involved in elevation of the temporomandibular joint
Temporalis, masseter and medial pterygoid
Name the muscles involved in protrusion at the temporomandibular joint
Masseter (superficial fibres), lat and medial pterygoid
How does the mandible move from side to side?
Contraction of temporalis muscle on same side, pterygoid muscles on opposiet side and masseter
What other muscles are found in the infratemporal region?
Buccinator, orbicularis oris, superior constrictor, posterior belly of digastric, tensor & levator palatini muscles
What do the tensor and levator palatini muscles do?
Control the soft palate during swallowing and speech
Name the branches of the mandibular nerve (CNV3)
Buccal, auriculotemporal, lingual and inferior alveolar
What does the auriculotemporal nerve do?
Conveys parasympathetic fibres from the otic ganglion to the parotid gland
On the way it envelops the middle meningeal artery
Auriculotemporal nerve then supplies external acoustic meatus, tympanic membrane and skin of temple
What does the lingual nerve do?
Joined by the chorda tympani of the facial nerve so taste fibres split off to the chorda tympani and general sensory fibres of the lingual carry on
What does the inferior alveolar nerve do?
Gives off small motor branch to the mylohyoid and continues as a sensory nerve to supply the mandibular canal and lower teeth. The terminal part emerges at the mental foramen to supply the lower lip and chin
Describe the mandibular nerve
Enters infratemporal fossa by the foramen ovale
Supplies medial and lateral pterygoids, tenosr palatini, temporalis and masseter. Buccal nerve supplies sensory fibres to cheek.
Describe path of middle meningeal artery
Passes deep to lateral pterygoid, between roots of the auriculotemporal nerve to enter skull by foramen spinosum
Describe venous drainage of infratemporal fossa
By veins corresponding to maxillary artery branches, pterygoid plexus and into maxillary vein. These communicate with cavernous sinus and facial vein