Deep Face I Flashcards
temporal fossa
space found superior to the zygomatic arch
infratemporal fossa
space found inferior to the zygomatic arch
boundaries of the infratemporal fossa
Lateral=Ramus of Mandible Anterior=Maxilla Medial=Lateral Pterygoid Plate Roof=Sphenoid Posterior = Tympanic plate & mastoid and styloid processes Inferior = Angle of Mandible
Contents of the infratemporal fossa
Inferior portion of Temporalis m.; Lateral & Medial Pterygoid muscles; Maxillary a.; Pterygoid venous plexus; Nervous Structures: inferior alveolar (V 3 ); Lingual (V 3 ); Buccal (V 3): Chorda tympani (CN VII); Otic ganglion
Bones of the Temporal Fossa (labeled)
Lateral view vasculature (labeled)
Muscles of Mastication
refers to process of chewing; innervated by Trigeminal N; move the mandible at the temporomandibular joint; 4 paired muscles - temporalis, masseter, lateral pterygoids, medial pterygoids
top: lateral pterygoid
middle: medial pterygoid
bottom: masseter
Top: temporalis
2nd: masseter
3rd: buccinator
4th: orbicularic oris
(3rd + 4th = CNVII)
What 2 muscles function close to the jaw?
temporalis and masseter
label the 2nd and 3rd lines and the function of the 3rd?
2nd: lateral pterygoid
3rd: medial pterygoid - elevates and protracts the mandible
Posterior view of mandibular sling (labeled)
What opens the mandible?
gravity, anterior digastric, lateral pterygoid (inferior part)
Function of Temporalis
elevates and retracts mandible
function of Masseter
elevates and protracts mandible; prime mover of jaw closure
function of lateral pterygoid
protracts mandible; produces side-to-side movement of mandible
function of medial pterygoid
elevates and protracts mandible; prduces side-to-side movement of mandible
Movements of the temporomandibular joint
Elevation (temporalis, masseter, medial pterygoids); Depression (lateral pterygoids, suprahyoid & infrahyoid muscles); Protrusion (lateral pterygoids, masseter, medial pterygoids); Retrusion (temporalis, masseter); Lateral Movements (ipsilateral temporalis,contralateral pterygoids, masseter)
biggest arrow?
Temporomandibular joint capsule
Joint capsue (labeled) sagital section
Ligaments (labeled)
Innervation (labeled) V3, etc
Deeper innervation (labeled)
Oral cavity coronal section (labeled)
Open mouth labeled
Hemisection of mouth (labeled)
Intrinsic muscles of the tongue
curl, squeeze and fold the tongue during chewing and speaking.
extrinsic muscles of the tongue
originate on other head and neck structures and insert on the tongue. glossus = “tongue”
left and right genioglassus muscles
originate on the mandible and protract the tongue
left and right styloglossus muscles
originate on the styloid processes of the temporal bone; elevate and retract the tongue (pull back into the mouth)
left and right hyoglossus muscles
originate at the hyoid bone and insert on the sides of the tongue; depress and retract the tongue
left and right palatoglossus muscles
originate on the soft palate; elevate the posterior portion of the tongue
Muscles of the tongue (labeled)
pharynx
“throat”; funnenl-shaped tube that lies posterior to both the oral and nasal cavitites; muscles help form or attach to this tube and aid in swalowing; primary pharynx muscles are the pharyngeal constrictors; initiate swallowing and force bolus inferior into esophagus; help elevate or tense palate when swallowing
pharynx muscles (labeled)
if a muscle has the root “tensor” in its name, it’s innervated by what nerve?
CN V (Trigeminal)
if a muscle has the root “palat-“ in its name, it’s innervated by what nerve?
CN X (Vagus)
If a muscle has the root “-glossus” in its name, it’s innervated by what nerve?
CN XII (Hypoglossal)
What are the 3 laryngeal elevators?
palatopharyngeus; salpingopharyngeus; stylopharyngeus (they all elevate the larynx and pharynx)
Innervation of the laryngeal elevator muscles
palatopharyngeus and salpingopharyngeus innervated by CN X (Vagus) and stylopharyngeus is innervated by CN IX (glossopharyngeal)
What are the palate muscles?
levator veli palatini (levator, velum, palato); tensor veli palatini
Innervation of the palate muscles
Levator veli palatini - CN X (Vagus) and Tensor veli palatini - CN V3 (mandibular branch of Trigeminal)
What are the pharyngeal constrictor muscles?
superior constrictor; middle constrictor; inferior constrictor
What is the innervation of the pharyngeal constrictor muscles?
All innervated by CN X (Vagus)
What are the muscles that move the tongue and their innervation?
Genioglossus (CN XII Hypoglossal); Styloglossus (CN XII - hypoglossal); Hyoglossus (CN XII - hypoglossal); palatoglossus (CN X - Vagus)
