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Exam 2-Infratemporal Fossa
Infratemporal Fossa
27
Anatomy
Graduate
08/07/2011

Additional Anatomy Flashcards

 


 

Cards

Term

Masseter Muscle

 

Superficial Portion

Definition

Origin: anterior 2/3 of zygomatic arch

Insertion: lateral ramus of mandible to angle

Term

masseter muscle

 

deep portion

Definition

origin: medial surface of zygomatic arch

 

insertion: superior half of mandibular ramus

Term

masseter muscle

 

Action

Definition

elevate mandible in biting and mastication.  

unilaterally, produces transverse movements of mandible

Term

Temporalis Muscle

 

origin,insertion,action

Definition

Origin: whole of temporal fossa and temporalis fascia

 

Insertion: coronoid process of mandible and anterior and medial border or ramus to behind distal molars

 

Action: elevates mandible in biting and mastication.  Posterior fibers can retract mandible

Term

Infratemporal Fossa Boundaries 

 

Roof

Definition
gap between zygomatic arch and infratemporal creast
Term

Infratemporal Fossa Boundaries 

 

Lateral

Definition
Ramus of the mandible
Term

Infratemporal Fossa Boundaries 

 

Medial

Definition

Lateral pterygoid plate and pharynx

 

Term

Infratemporal Fossa Boundaries 

 

Anterior

 

Definition
Maxilla
Term

Infratemporal Fossa Boundaries 

 

Posterior

 

Definition
Condyle, styloid process, carotid sheath
Term

Infratemporal Fossa Boundaries 

 

Inferior

Definition
Open to neck/submandibular region
Term

infratemporal fossa communications

 

Foramina

Definition

Ovale

spinosum

posterior superior alveolar

mandibular 

 

Term

infratemporal fossa communications

 

fissures

Definition

inferor orbital

pterygomaxillary 

Term

infratemporal fossa contents

 

Muscles

Definition

Muscles of mastication

-tendon of temporalis

-medial pterygoid m

-lateral pterygoid m

Term

infratemporal fossa contents

 

blood vessels

 

Definition

maxillary artery and vein

 

 

Term

infratemporal fossa contents

 

nerves

Definition

-mandibular n and its branches

-posterior superior alveolar n

-chorda tympani n

-otic ganglion

-sympathetics

Term

Lateral Pterygoid Muscle

 

Superior Head

(origin,insertion,Action)

Definition

Origin: Infratemporal crest and greater wing of sphenoid 

 

Insertion: Articular disc, joint capsule, and anterior condylar neck

 

action: control position of disc during closing  

Term

Lateral Pterygoid Muscle

 

Inferior Head

(origin, insertion, action)

Definition

Origin: Lateral surface of lateral pterygoid plate

 

Insertion: Depression on anterior condylar neck (pterygoid fovea)

 

Action: protrude and depress mandible (bilateral); side-to-side movements (unilateral)

Term

Medial Pterygoid Muscle

 

Origin, insertion, action

Definition

Origin: Medial surface of the lateral pterygoid plate

-posterior portion of the palatine(pyramidal process)

-maxillary tuberosity 

 

Insertion: Medial aspect of angle of mandible 

-inferior to mandibular foramen

 

Action: Elevates and protrudes mandible(bilaterally)

-produces side-to-side movements(unilaterally)

Term

Maxillary Artery Branches

 

First Part-Before the Lateral Pterygoid m

Definition

- Inferior alveolar a

-middle meningeal a

-accessory a

-deep auricular a

-anterior tympanic a

Term

Maxillary Artery Branches 

 

2nd part- in front of behind the lat. pterygoid m

(muscular branches)

Definition

-Masseteric a

-deep temporal a

-buccal a

 

 

Term

Maxillary artery branches

 

3rd part-beyond lat pterygoid m.

(in pterygoid maxillary fissure)

Definition

Posterior superior alveolar a.

 

only one mentioned 

Term
Chorda Tympani n
Definition

-Preganglionic fibers of CN7 to submandibular ganglion(secretomotor to submandibular and sublingual glands)

-Conveys taste sensations from anterior 2/3's of tongue 

-Enters infratemporal fossa via petrotympanic fissure

-Joins lingual n in fossa, carried to tongue and floor of mouth.

Term

Otic Ganglion

 

Definition

-Parasympathetic ganglion from CN9

-Secretomotor to parotid gland

-Located medial to CN V3

 

Term

Otic Ganglion Course

(preganglionic)

Definition

-glossopharyngeal n CN9

-tympanic nerve and then plexus

-lesser petrosal n

 

Term

Otic Ganglion Course

(postganglionic)

 

Definition
auriculotemporal n
Term

Infratemporal fossa

(sympathetic innervation)

 

Course and function

Definition

-sympathetic postganglionic from superior cervical ganglion

-via external carotid plexus(maxillary a and its branches, including middle meningeal a)

-function: Vasoconstriction

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