TIPS Flashcards by Meghan May

fibers of fan shape muscles of mastication go from temporal fossa→ coroniod process mandible

Temporalis muscle

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Contents of Temporal fossa

temporalis muscle

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. Posteriorly + Superiorly: Temporal Lines
Anteriorly: Frontal and Zygomatic bones
Laterally: Zygomatic Arch
Inferiorly: Infratemporal Crest—a ridge formed by temporal and sphenoid bones deep 2 zyg.. arch
Floor: bones in region of pterion

Boudary of Temporalis fossa

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inferior to zyg arch and posterior to maxilla, deep to mandible

Inferior temporal fossa

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Muscles in Infratemporal fossa invervated by

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elevates mandible/retracts mandible (moves it posteriorly)

Temporalis

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lateral to zyg arch, cnxt to inf angle of ramus (not technically IN infratemp fossa)
–lifts up angle of mandible = ELEVATION

Masseter

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Muscle of Mastication ______ thus bilaterally will ______ the mandible

(PAIRED STRUCTURES)
protract or protrude
FORWARD

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bilateral for protraction of mandible and depresses chin

Lateral Ptyergoid

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unilaterally contractions (one then other) will be used for large chewing motions or GRINDING

Lateral pterygoid

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Inserts at greater wing and lateral surface of lateral pterygoid plate→capsule of TMJ + condyloid process

Lateral ptyergoid

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Inserts at medial surface of lateral pterygoid plate → medial aspect of ramus of mandible

Medial pterygoid

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Bilateral: elevalte mandible and protrube chin

Medial ptyergoid

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Unilateral motion: small chewing motions

Medial ptyergoid

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Common Feature of muscles of mastication is their attachment to which bone?

A: Mandible

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Only muscle of mastication that contributes to opening of jaw?

A: Lateral Pterygoid

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Temporormandibular Joint (TMJ)
	1.\_\_\_\_\_ w/ synovial btwn; between mandibular condyle and mandibular fossa

Hinge joint

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connects zyg arch→condyle of mandible

*Intrinsic part; other two are extrinsic

Lateral ligament

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connects styloid process→ poster aspect of ramus of mandible

-doesn’t limit mvmt of jaw, extrinsic

Stylomandibular ligament:

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from sphenoid bone→ projection called lingula on medial aspect of ramus w/ mandibular foramen near there (mylogyoid branch of inferior alveolar artery and mylohyoid nerve)
–limits extent you can open jaw, extrinsic

Sphenomandiublar lig:

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lined w/ synovial membranes + fluid

-fibers here are LOOSE to allow for sliding mvts of condyl

Upper compartment:

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-fibers here are TIGHT limit to rotational movements

Lower compartment

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: dislocation is usually

external branch of carotid (along w/ superficial temporal art)
–passes forward and medially

Maxillary Artery:

heads to foramen spinosum for bones of cranial cavity and meninges --encircled by auriculotemporal nerve from V3

Middle Meningeal Artery

heads into mandibular foramen on medial aspect of mandbile and through canal and emerges through mental foramen to give off mental nerve and foramen for mental region/chin region

Inferior alveolar nerve

What supplies temporalis muscle?

muscluar branches of pterygoid part of Maxillary artery

medial and lateral pterygoid mslcs supplied by?

Muscluar branhces off the pterygoid part of Maxillary artery

What 5 branches come off the pterygopalatine part of Maxillary

a. post/superior alveolar a. b. Intraorbital a. c. Artery of pterygoid canal: d. Descending palatine artery: e. Sphenopalatine a

enters post surface of maxilla to supply upper teeth

post/superior alveolar a.

: supply hard palate anterior/soft posteriorly

Descending palatine artery

comes forward and goes through inferior orbital fissure through canal on deep part of orbit and emerges from infraorbial foramen on maxilla

Intraorbital a.

will terminate as it goes anteriorly into the sphernoid artery to supply nasal septum/artery

Maxillary artery

a. has cnx w/ veins on face that are valveless CC: infection can spread here b. superior connection to cavernous sinus (on either side of sphenoid bone) CC: infection/thrombis can move to here too

Pterygoid plexus of veins

1. Mandibular Division V3 (MIXED) and has these 5 branches

a. Muscular Branches; b. Buccal n c. Auriculotemporal n. d. Inferior alveolar e. Lingual n.

supply masstication mscl

Muscular Branches from Mandible

(sensory) to cheek and mucosal lining and gingiva

Buccal n

sensory regioin of auricle and temple

Auriculotemporal n.

enters mandibular foramen and exits as mental nerve for sensory information from teeth of lower jaw

Inferior alveolar n.

is motor component of inferior alveolar nerve just before it enters mandibular foramen

Nerve to mylohyoid (chin strap muscle)

sensory for anterior 2/3 of tongue (touch, temp) and taste sensation (d/t chorda typmpani)

Lingual n.

Do taste fibers follow trigeminal nerve back?

(but these taste fibers don’t follow trigeminal back~ connects w/ chorda tympani instead from facial nerve VII

carries secretomotor or pregang PNS/ANS (first runner) that synapse in submand ganglion (handoff) then post gangs (2nd runner) innervate submandibular and sublingual salivary glands.

Facial n. VII | a. Chorda tympani :

near external auditory meatus, part of ANS, innervates parotid

Otic Ganglion:

Anterior border of pterygopalatine fossa

—maxilla

Posterior border of pterygopalatine fossa

pterygoid processes of sphenoid b.

Superior border of pterygopalatine fossa

greater wing of sphenoid b.

Medial border of pterygopalatine fossa

verticle plate of palatine b. (L shaped bones that make up part of hard palate w/ superior projections contributing to this space)

Lateral Wall of PPF

does not exist= pterygomaxillary fissure

Medially: in palatine bone, contains:

sphenopalatine foramen (tiny opening)

a. sphenopalatine foramen connects:

connects pterygopalatine fossa →nasal cavity | -location where maxillary artery comes and as soon as it enters becomes sphenopalatine artery

Posterior wall: 2 openings

a. Foramen Rotundum | b. Pterygoid Canal

a. Foramen Rotundum

V2/Maxillary division of Trigeminal enters PGPF here from middle cranial fossa - -continues anteriorly and passes through inferior orbital fissure - -As enters inferior orbital fissure becomes infra orbital nerve

b. Pterygoid Canal:

nerve of ptyergoid canal and artery of pterygoid canal = Vidian n. and artery and pass through pterygoid canal into the fossa --Vidian Nerve= Greater Petrosal and Deep Petrossal nerve→ lacrimal gland = tears

Inferiorly, what comes out of PPF?

Apex in this region called Palatine Foramina a. Greater Palatine Foramen: Greater Palatine N. and Art pass through here and inferiorly—supplies hard palate b. Lesser Palatine Foramen: Lesser Palatine N. and Art emerge and supply soft palate