infratemporal fossa
DESCRIPTION
BMES208 Human Musculoskeletal System Kittikun Viwatpinyo, Ph.D.`Infratemporal fossa : area in the head medial to zygomatic arch and ramus of mandible, and inferior to temporal fossa(Agur & Dalley, 2008)`Walls of infratemporal fossa composed of 5 bones : Temporal bone, Sphenoid bone, Zygomatic bone, Maxilla and Mandible.(Agur & Dalley, 2008)(Agur & Dalley, 2008)(Drake, Wayne & Mitchell, 2005)` `Body of mandible Ramus of mandibleCondylar process Coronoid process MandibulaTRANSCRIPT
Infratemporal fossa
BMES208 Human Musculoskeletal System
Kittikun Viwatpinyo, Ph.D.
Infratemporal fossa : area in the head medial to zygomatic arch and ramus of mandible, and inferior to temporal fossa
Infratemporal fossa : Intro
(Agur & Dalley, 2008)
Walls of infratemporal fossa composed of 5 bones : Temporal bone, Sphenoid bone, Zygomatic bone, Maxilla and Mandible.
Infratemporal fossa : Bony walls
(Agur & Dalley, 2008)
Infratemporal fossa : Bony walls
(Agur & Dalley, 2008)
Infratemporal fossa : Bony walls
(Drake, Wayne & Mitchell, 2005)
Body of mandible Ramus of mandible◦ Condylar process◦ Coronoid process◦ Mandibular foramen◦ Lingula◦ Mylohyoid groove
Mandible
Tank, 2005)
TMJ is a modified hinge type synovial joint between mandibular fossa of temporal bone and head of mandible
Temporomandibular joint
(Agur & Dalley, 2008)
Articular disc separates joint capsule into 2 compartments : ◦ Lower compartment : Hinge movement◦ Upper compartment : Gliding movement
Temporomandibular joint
(Drake, Wayne & Mitchell, 2005)
(Moore, Dalley & Agur, 2010)
Extracapsular ligaments of TMJ◦ Lateral (Temporomandibular) ligament◦ Sphenomandibular ligament◦ Stylomandibular ligament
Temporomandibular joint
(Drake, Wayne & Mitchell, 2005)
Movements through TMJ :◦ Elevation-Depression◦ Protrusion-Retraction◦ Lateral movement (side-to-side)
Temporomandibular joint
(Drake, Wayne & Mitchell, 2005)
(Moore, Dalley & Agur, 2010)
Masseter m. Temporalis m.
Muscles of mastication
(Drake, Wayne & Mitchell, 2005)
Lateral pterygoid m.
Muscles of mastication
(Drake, Wayne & Mitchell, 2005)
Medial pterygoid m.
Muscles of mastication
(Drake, Wayne & Mitchell, 2005)
Branches of Mandibular nerve (CN. V3) Autonomic nerves : ◦ Chorda tympani ◦ Lesser petrosal nerve
Nerves of infratemporal fossa
(Agur & Dalley, 2008)
Muscular branches : Masseteric n., Deep temporal n. Buccal nerve : sensory from cheek and buccal mucosa
Mandibular nerve : Anterior trunk
(Drake, Wayne & Mitchell, 2005)
Auriculotemporal nerve ◦ Sensory from TMJ and skin of parotid and temporal region◦ Postganglionic parasym fibers to parotid gland
Mandibular nerve : Posterior trunk
(Drake, Wayne & Mitchell, 2005)
Lingual nerve◦ Sensory from anterior 2/3 of tongue and floor of oral mucosa◦ Chorda tympani nerve joins lingual nerve
Mandibular nerve : Posterior trunk
(Drake, Wayne & Mitchell, 2005)
Inferior alveolar nerve◦ Sensory from lower teeth & skin from lower lip and chin (via
mental nerve)◦ Nerve to mylohyoid : motor to mylohyoid and anterior belly of
digastric
Mandibular nerve : Posterior trunk
(Drake, Wayne & Mitchell, 2005)
Chorda tympani nerve◦ Postganglionic parasym fibers to submandibular &
sublingual glands◦ Taste from anterior 2/3 of tongue
Autonomic nerves
(Drake, et al., 2007)
Lesser petrosal nerve◦ Preganglionic parasym fibers to Otic ganglion, which sends
postganglionic parasym fibers to parotid gland via auriculotemporal nerve
Autonomic nerves
(Drake, et al., 2007)
Maxillary artery is the largest branch of external carotid artery, and a major artery in infratemporal region
Three parts (relate to lateral pterygoid m.)
Maxillary artery
Tank, 2005)
Middle meningeal artery◦ Mostly from 1st part ◦ Passes upward and
enters cranial cavity through Foramen spinosum
◦ Supplies major parts of meninges
◦ Damage of artery : Epidural hemorrhage
Maxillary artery
(Drake, Wayne & Mitchell, 2005)
(Moore, Dalley & Agur, 2010)
Inferior alveolar artery◦ From 1st part, passes downward into mandibular foramen with
inferior alveolar n.◦ Supplies lower teeth, buccal side of gingiva, and also lower lip
and chin (by mental artery)
Maxillary artery
(Drake, Wayne & Mitchell, 2005)
Pterygoid plexus is a major venous drainage of infra-temporal region◦ Receives blood from cranial cavity, orbit, nasal and oral
cavities, and drains into retromandibular vein and deep facial vein
Pterygoid venous plexus
(Drake, Wayne & Mitchell, 2005)