Anatomy-Infratemporal Fossa Flashcards
What structures are indicated below?
1) Temporal process of the zygomatic bone 2) Zygomatic process of temporal bone 3) Masseter 4) Temporalis
What structures are indicated below.
Note that the ramus of the mandible is the lateral boundary of the infra temporal fossa. 1) Mandibular foramen 2) Lingula 3) Mylohyoid groove 4) Mandibular notch 5) Coronoid process 6) Condyloid process (head of mandible)
What structure is indicated below? What muscles attach to it?
This is the lateral pterygoid plate. The medial & lateral pterygoid muscles attach to this bone. Note that this bone is the medial boundary of the infra temporal fossa.
What structures form the anterior boundary of the infra temporal fossa?
1) Pterygomaxillary fissure and 2) Inferior orbital fissure.
What structures form the posterior boundary of the infra temporal fossa?
1) Styloid process 2) Tympanic plate
What structures form the superior boundary of the infra temporal fossa?
Infratemporal surface of the greater wing to the sphenoid. Note that the foramen ovale, foramen spinosum and spine of sphenoid are contained in this boundary.
What structure forms the inferior boundary of the infra temporal fossa?
Medial pterygoid muscles.
What artery is indicated below? What are its different parts?
Maxillary artery. Note that it is lying right on top of the lateral pterygoid muscle. It is divided into the mandibuluar part, pterygoid part and pterygopalatine part.
What are the branches of the mandibular part of the maxillary artery?
Middle meningeal (passes through foramen spinosum) and inferior alveolar (passes through mandibular canal and exits mental foramen, where it becomes the mental artery) arteries.
What are the branches of the pterygoid part of the maxillary artery?
Deep temporal (runs along pericranium), buccal (superficial to lateral pterygoid), masseteric (course through mandibular notch) and pterygoid arteries.
What are the branches of the pterygopalatine part of the maxillary artery?
Sphenopalatine (exits sphenopalatine foramen), Infraorbital (runs on exits infraorbital foramen), posterior superior alveolar (penetrates tuberosity of maxilla), and palatine arteries.
What structures are indicated in the image below?
1) Lateral pterygoid muscle (note that both heads insert on the head of the mandible) 2) Medial pterygoid muscle (note that it makes up the medial sling of muscle on the mandible next to the masseter).
What nerves are associated with the muscles of mastication?
V3 main trunk enters infratemporal fossa. Gives off anterior and posterior branches. Anterior division: buccal nerve is the only sensory nerve, deep temporal and masseteric nerves are motor. Posterior division: mylohyoid is only motor nerve,
What structure is indicated below?
Buccal nerve. Note how it runs next to the buccal artery and between the two heads of the lateral pterygoid muscle. This is the only sensory branch off of the anterior division of V3. It supplies the cheek.
How can you identify the masseter nerve?
It passes through the mandibular notch and sits on the back side of the masseter.
What structures are indicated below?
1) Auriculotemporal nerve (note that it goes behind the TMJ and encircles middle meningeal artery) 2) Lingual nerve 3) Inferior alveolar nerve (note that the mylohyoid pops off this nerve, also note that it comes out of the mental foramen to become the mental nerve).
Where will you find nerves in the infra temporal fossa that originated from the inferior salivatory nucleus? The superior salivatory nucleus?
Autonomic components of CN IX come from the inferior salivatory nucleus and VII components come from the superior salivatory nucleus. CN IX fibers synapse on the otic ganglion, hitch a ride with the auriculotemporal nerve and innervate the parotid gland. CN VII sends out the chorda tympani which rides near the lingual nerve synapses and innervates the sublingual and submandibular glands.
What two bones articulate with each other in the temporalmandibular joint?
Mandibular fossa and articulate tubercle articulate with the head of the mandible (condyloid process)
What structures are indicated below?
1) Lateral temporalmandibular ligament and medial: 2) Sphenomandibular & 3) Stylomandibular ligaments.
