Deep Face Flashcards
_____ is the space found superior to the zygomatic arch
Temporal fossa
_____ is the space found inferior to the zygomatic arch
infratemporal fossa
Boundaries of Infratemporal Fossa
- Lateral
- Ramus of mandible
- Anterior
- Maxilla
- Medial
- Lateral Pterygoid Plate
- Roof
- Sphenoid
- Posterior
- Tympanic plate and mastoid and syloid process
- Inferior
- Angle of mandible
*
- Angle of mandible
Contents of Infratemporal Fossa
- Inferior portion of Temporalis m.
- Lateral and Medial Pterygoid muslces
- Maxillary artery
- Pterygoid venous plexus
- Nervous Structures:
- Inferior alveolar (V3)
- Lingual (V3)
- Buccal (V3)
- Chorda Tympani (CN VII)
- Otic ganglion
Muscles of Mastication
- Innervated by the trigeminal nerve (CN V3)
- move the mandible at the temporomandibular joint
- Four paired muscles of mastication
- Temporalis
- masseter
- lateral pterygoids
- medial pterygoids
What opens the Mandible
- Gravity
- Anterior digastric
- Lateral pterygoid (inferior part)
_____ elevates and protracts the mandible
medial pterygoid
Function of Temporalis muscle
Elevates and retracts mandible
Funciton of Masseter muscle
Elevates and protracts mandible; prime mover of jaw closure
Muscles of mastication are innervated by
The Trigeminal nerve (CN V3)
Action of Temporalis muscle
Elevates and retracts mandible
Action of masseter muscle
elevates and protracts mandible; prime mover of jaw closure
ateral pterygold
protracts mandible; produces side-to-side movemnt of mandible
Action of Medial pterygold
Elevates and protracts mandible; produces side-to-side movment of mandible
Movements of the Temporomandibular joint (TMJ)
- Elevation
- Temporalis, masseter, medial pterygoids
- Depression
- Lateral pterygoids, suprahyoid, and infrahyoid muscles)
- Protrusion
- Lateral pterygoids, massete, medial pterygoids
- Retrusion
- Temporalis, masseter
- Lateral movements
- Ipsilateral temporalis, contralateral pterygoids, masseter
The tongue consists of ____ muscles that curl, squeeze, and fold the tongue during chewing and speaking
intrinsic muscles
The ____ muslces of the tongue, originate on other head and neck structures and insert on the tongue
Extrinsic muslces
Muscles of the tongue
- Left and right genioglossus muscles:
- originate on the mandible and protract the tongue
- The left and right styloglossus muscles originate on the styloid process of the temporal bone
- elevate and retract the tongue(pull the tongue back into the mouth)
- The left and right hyoglossus muslces originate at the hyoid bone and insert on the sides of the tongue
- depress and retract the tongue
- The palatoglossus muscles originate on the soft palate.
- Elevate the posterior portion of the tongue
Muscles of the Pharynx (throat)
- Primary pharynx muscles are the pharyngeal constrictors (superior, middle, and inferior)
- Initiate swallowing and force the bolus inferiorly into the esophagus
- Help elevate or tense the palate when swallowing
The Stylopharyngeus is innervated by the
CN IX (glossopharyngeal nerve) via branches of pharyngeal plexus
What is Stern’s Rule
- A Hierarchical rule that refer only to the head
- If a muscle has the root “tensor” in its name, it’s innervated by CN V
- If a muscle has the root “palat-“ in its name, it’s innervated by CN X (Vagus nerv)
- If a muslce has the root “-glossus” in its name, it’s innervated by CN XII (Hypoglossal nerve)
