Human Gross Exam #4

Branches of the subclavian artery

1st part: vertebral, internal thoracic, thyrocervical

2nd part: costocervical trunk

3rd part: dorsal scapular

Infratemporal fossa boundaries

lateral: ramus of mandible

medial: lateral pterygoid plate

anteriorly: posterior aspect of maxilla

posterior: tympanic plate and mastoid and styloid processes of temporal bone

superior: inferior surface of greater wing of sphenoid bone

inferior: where medial pterygoid inserts

Contents of infratemporal fossa

inferior part of temporalis, lateral and medial pterygoids, maxillary a., pterygoid venous plexus, mandibular, inferior alveolar, lingual, buccal, and chord tympani n., otic ganglion

retromandibular part branches

deep auricular, anterior tympanic, middle meningeal, accessory meningeal, inferior alveolar

pterygoid part branches

deep temporal, pterygoid, masseteric, buccal

pterygopalatine part branches

posterior superior alveolar, infraorbital, descending palatine, artery of pterygoid canal, pharyngeal, sphenopalatine

what muscles elevate/close the mouth at TMJ?

temporalis, masseter, medial pterygoid

what muscles depress/close mouth at TMJ?

lateral pterygoid, suprahyoid, infrahyoid

what muscles cause protrusion of the chin at TMJ?

lateral pterygoid, masseter, medial pterygoid

what muscles cause retrusion of chin at TMJ?

temporalis and masseter

what muscles are responsible for lateral movement (i.e. grinding and chewing) at TMJ?

temporalis of same side, pterygoids of opposite side, masseter