Anatomy: Temporal & Infratemporal Fossae Part 2 Flashcards
Branches of the anterior division of V3 (mandibular division of the trigeminal nerve
- Nerve to the masseter
- Nerve to the lateral pterygoid
- Deep temporal nerves
- Buccal nerve
Nerve to the masseter innervates the ….
Masseter; gives a few sensory fibers to the anterior aspect of the temporomandibular joint because it’s in that vicinity
Nerve to the lateral pterygoid innervates the …
Pterygoid
Deep temporal nerves
Usually 2 (anterior & posterior) nerves; sometimes there’s a third (middle) nerve
Buccal nerve supplies ….
Sensory innervation!!!! To the skin and mucosa of the cheek
Buccal branch of 7 (facial nerve) = motor
Buccal branch of 5 (trigeminal nerve)= sensory
Branches of the posterior division of V3 (mandibular division of trigeminal nerve)
- Auriculotemporal nerve
- Inferior alveolar nerve
- Nerve to the mylohyoid
- Lingual nerve
Auriculotemporal nerve
- Originates as two roots that encircle the middle meningeal artery and reunite posterior to the artery
- Provides sensory innervation to the auricle, external auditory meatus, tympanic membrane, temporomandibular joint and scalp.
Inferior Alveolar Nerve
- Contains both sensory & motor fibers
- Enters mandibular foramen to supply all of the mandibular teeth
- Exits mandible at mental Foramen and continues as mental nerve
- -Before entering the mandibular foramen, the NERVE TO THE MYLOHYOID is given off
[alveolar = teeth]
Nerve to the mylohyoid
- A motor branch of the inferior alveolar nerve
- Innervates the mylohyoid and the anterior belly of the digastric
Lingual nerve
- Provides general sensory info (touch, pain, temp) to anterior 2/3 of the tongue and the mucosa of the floor of the mouth
- Joined high in the infratemporal fossa by the chorda tympani
A small, PARASYMPATHETIC GANGLION located inferior to the foramen ovale (in the temporal fossa) and medial to V3; Tympanic branch of CN IX forms the tympanic plexus (supplies the mucosa of the tympanic cavity)
Otic ganglion
Fibers in the Otic Ganglion
- Preganglionic Parasympathetic
- Postganglionic Parasympathetic
Fibers that leave the tympanic plexus in the form of the LESSER PETROSAL NERVE and synapse in the otic ganglion
Preganglionic Parasympathetic
Fibers that leave the otic ganglion and join the auriculotemporal nerve
Postganglionic parasympathetic
What do the postganglionic parasympathetic fibers leaving the otic gland innervate?
Parotid Gland
Where does the chorda tympani originate from?
CN VII (facial nerve) in the facial canal just above the stylomastoid foramen.
Path of the chorda tympani
- Enters tympanic cavity and courses across the medial side of the tympanic membrane (ear drum)
- EXITS THE TEMPORAL BONE VIA THE PETROTYMPANIC FISSURE
- Enters the infratemporal fossa where it JOINS THE LINGUAL NERVE (important b/c it is transmitting the taste fibers (sensory) of the anterior 2/3 of the tongue)
What special fibers does the chorda tympani contain, and what are they for?
Special sensory or tats fibers for the anterior 2/3 of the tongue
Fibers of the chorda tympani
- Preganglionic parasympathetic fibers
- Postganglionic parasympathetic fibers
Where do the preganglionic parasympathetic fibers of the chorda tympani synapse?
Submandibular ganglion
What do the postganglionic parasympathetic fibers from the chorda tympani supply?
Submandibular and Sublingual Salivary Glands
What are the two terminal branches of the external carotid artery?
Maxillary Artery
Superficial Temporal Artery
Terminal branch of the external carotid artery; Arises posterior to the neck of the mandible; Divided into 3 parts based on its relation to the lateral pterygoid muscle, with each part having a specific branch.
Maxillary Artery
Parts of the maxillary artery (wouldn’t ask us on the test)
- Mandibular Part
- Pterygoid Part
- Pterygopalatine Part
