Temporal Fossa, Infratemporal Fossa & TMJ
Chorda tympani nerve ITF entrance
Chorda tympani enters the ITF from the middle ear through the petrotympanic fissure - a tiny crack in the temporal bone just anterior to the temporomandibular joint.
Maxillary Artery parts
It is useful to divide the maxillary artery into three portions, designated according to their relationship to the lateral pterygoid muscle.
The roof of the ITF is related to the?
Temporal Fossa and the Middle Cranial Fossa
TMJ anatomy
The articular capsule of the TMJ is attached around the edge of the mandibular fossa, to the articular tubercle, and to the neck of the mandible just below the condyle. Laterally, the capsule is reinforced by the lateral ligament of the TMJ (an extracapsular ligament). The TMJ has an articular disc (called the meniscus by clinicians) situated in the center of the joint space. It attaches to the entire circumference of the joint capsule of the TMJ, dividing the joint space into two joint cavities: upper and lower. The disc is thin in the middle and thickened anteriorly and posteriorly.
lingual nerve carries what parasympathetic fibers?
The lingual nerve of V3 carries "hitch-hiking" fibers of the chorda tympani nerve = taste fibers from the anterior 2/3 of the tongue and pre-ganglionic PS fibers heading for the submandibular ganglion.
Maxillary Artery <> Lateral Pterygoid Muscle Relationships
flip the script
apertures through which the ITF communicates with other regions of the head
zygomatic spiny ovals orbit pterydactyl (max) man
TMJ clicking
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TMJ ligaments
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Temporalis two functional parts
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Temporomandibular joint (TMJ)
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V3 - Lateral Pterygoid Removed
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contents of ITF- muscles of mastication
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medial pterygoid
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where's the Infratemporal Fossa?
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Movements of the mandible
medial for eating meat
Parasympathetic PathwaysThrough the ITF
pertro chord
V3 and the Pterygoid Muscles
pirate between two pterydactyls
Pterygoid Venous Plexus!
plexus of veins that surrounds the maxillary artery, lying both superficial and deep to the lateral pterygoid muscle. Tributaries of the pterygoid plexus drain structures that are supplied by the maxillary artery. ptyerodactyl flies into his cave
big freaking list of nerves from V3
1. Meningeal branch 2. Nerve to medial pterygoid m. 3. Nerve to tensor tympani m. 4. Nerve to tensor veli palatini m. 5. Deep temporal nerves (anterior & posterior) 6. Masseteric n. 7. Nerve to lateral pterygoid m. 8. Buccal n. 9. Auriculotemporal n. 10. Lingual n. 11. Inferior alveolar n. 12. Nerve to mylohyoid & anterior belly of digastric m.
oitic ganglion relay point for?
relay point for preganglionic parasympathetic fibers from the lesser petrosal nerve (cranial nerve IX lesser petrosal, try to dump petro out of hot air balloon to keep flying
Pterygoid Muscles
-(Medial and Lateral) are in the ITF -Main origins are from the Medial and Lateral Surfaces of Lateral Pterygoid Plates - thus their names. -Lateral pterygoid: Upper & Lower Heads -Medial pterygoid: Superficial & Deep Heads
Maxillary artery
*Part 1* Proximal to lateral pterygoid- branches pass through bony openings *Part 2* Relates to lateral pterygoid - branches to muscles. *Part 3* Distal to lateral pterygoid (enters PP fossa) - branches pass through bony openings.
ITF Mandibular division of the trigeminal nerve (V3)
*The major nerve of the ITF is V3*. This nerve consists of a sensory root and a smaller motor root. The roots pass separately through foramen ovale and unite just inside the ITF. Once in the ITF, the main trunk of V3 divides into an anterior and a posterior division. ITF= voom
"Check" ligaments of TMJ
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Articular Disc (Meniscus) of TMJ
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Chorda tympani nerve path
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General features of synovial joints
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Mandibular Division of CN V (V3)
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Normal TMJ Function
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Normal TMJ Function!
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Pterygoid Venous Plexus
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maxillary enter ITF from?
Enters the ITF from the substance of the parotid gland, passing deep to the neck of the mandible.
Temporal Fossa
Filled by the temporalis muscle and its fascia, nerves and blood supply
Chorda tympani nerve function
From Cranial nerve VII, it carries taste fibers (afferents) from the anterior two-thirds of the tongue and preganglionic parasympathetic fibers (efferents) to the submandibular ganglion
Posterior superior alveolar nerves pass through
From V2, they *pass from the pterygopalatine fossa, through the pterygomaxillary fissure*, then along the anterior fringe of the ITF before penetrating the body of the maxilla to supply the upper molar teeth and related gingivae
boundaries of IT fossa
Imagine (if you will) the infratemporal fossa as a bony box, tipped upside-down, with its lid open. We will begin our discussion with an empty box, and then add its contents.
lesser petrosal path through ITF
Lesser petrosal enters the ITF through foramen ovale. *Postganglionic fibers travel with the auriculotemporal nerve to their destination*: the parotid gland. auri is trying to scoop to petro out of balloon
Muscles of Mastication
Masseter & Temporalis are Outside the ITF ... but we will study them here for convenience
Branches from the anterior division of V3
Most branches from the anterior division are motor (except the buccal nerve)
Branches from the posterior division of V3
Most branches from the posterior division are sensory - only the nerve to mylohyoid (a branch of the inferior alveolar nerve) is motor. mylo gets stabbed in the lungs
Otic ganglion location
One of the four parasympathetic ganglia of the head, lies medial to the mandibular nerve just inferior to foramen ovale
Masticator Fascial Space
The loose connective tissue in the ITF that surrounds the pterygoid muscles forms a potential space. This space is lateral to the lateral pharyngeal space. However, the lateral pharyngeal space and the masticator spaces do not communicate because a layer of deep fascia from the neck separates them. *Branches of V3, the maxillary artery, and the pterygoid plexus of veins are imbedded in the fascia of the masticator space.* max the ptyerodactyl drinking V8 juice, masticating
what drains pterygoid venous plexus?
The maxillary vein (often paired) ultimately drains the plexus
retromandibular vein formed from?
The maxillary vein joins the superficial temporal vein in the parotid gland, forming the retromandibular vein super+max in parotid= retro man
general stuff found in the temporal fossa
The temporal fossa is occupied almost completely by the temporalis muscle, along with its fascia (temporal fascia), its nerves (the anterior and posterior deep temporal nerves) and blood supply (deep temporal arteries from the maxillary artery and the middle temporal artery from the superficial temporal artery).
Innervation Of The Teeth
Upper: V2 Superior Alveolar Nerves: Posterior Middle Anterior Lower: V3 Inferior Alveolar Nerve
Anterior to the mandibular fossa is the?
articular tubercle
what kind of joint is TMJ?
synovial joint
The TMJ is the articulation between?
the condyle of the mandible and the mandibular fossa of the temporal bone
The maxillary artery supplies?
the upper and lower jaws, palate, nasopharynx, and nasal cavity.
