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Of the 3 branches of the Trigeminal nerve. Which branch contains motor fibers?
CN V3, mandibular. passes through foramen ovale to the infratemporal fossa. Only one with motor fibers.
- Remember O.R.O.
- 1. (v1 surperior Orbital fissure)
- 2. (v2 foramen Rotundum through pterygopalatine fossa) COVERS FROM THE UPPER LIP TO LOWER EYELID
- 3. (v3 foramen Ovale
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After dental work to the upper molars, a person presents with problems near the eye, which structure was affected with infection possibly?
Cavernous sinus infection, since the abducens nerve (to the eye) runs through it. and the cavernous sinus is where all of the blood from the head and face drains to. Double vision is the first sign, then starts to affect cranial nerve 3.
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V3 does motor innervation to which muscles?
- Mastication: temporalis, M. and L. Pterygoids and Masseter
- (2 tensors) Tensor veli palatini, tensor tympani, mylohyoid and anterior belly of digastric.
General sensory info to lower part of the fact, corners of the mouth and below. Anterior 2/3 of tongue, mandibular teeth, TMJ, oral mucosa and anterolateral scalp
- *V3 is the largest of CN V
- * Big branches are auricular temporal, long buccal, lingual and alveolar nerve
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Which branch of brings parasympathetic fibers to the parotid gland?
V3, Auriculotemporal nerve
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This branch of v3 conveys parasympathetic fibers from CN VII via chorda tympani to submandibular and sublingual glands (taste of anterior 2/3rd of tongue carried by same pathway.
- Lingual nerve (branch of v3)
- CN VII are the origin of these fibers, they just enter the trigeminal via chorda tympani and joins lingual nerve.
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Which cranial nerve contains the parasympathetic origin going to the parotid gland?
CN IX (Glossopharyngeal)
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Which cranial nerve contains the parasympathetic origin going to the sublingual and submandibular?
CN VII, also origin of taste for anterior 2/3rd of tongue
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The submandibular ganglion is the origin for parasympathetic activity to where?
- Submandibular gland
- Sublingual gland
- Anterior 2/3rd of tongue
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Chorda tympani originates from which cranial nerve and gets carried by which other nerve?
C.T. Originales from CN VII and then gets carried to the submandibular ganglion by the lingual nerve (of the mandibular division of CN 5 or v3)
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Which are the ganglia that relay the autonomic system of the head and neck?
- C. Ciliary - relay for parasympathetic signals mostly above corner of eye
- O. Otic - CN IX is the preganglionic nerve goes to auriculotemporal (branch of v3) is the post ganglionic parasympathetic to the parotid gland from this ganglia
- P. Pterygopalatine - pterygopalatine ganglion with the same name space relays . V2 relates postganglionic innervate hard palate, nasopharynx etc...
- S. Submandibular - CN VII comes here via chorda tympani to submand. and sublingual glands.
- ** THE ONLY SENSORY ONE IS TRIGEMINAL the others are Motor relays.
a Ganglion is a collection of cell bodies for sensory fibers (the trigeminal) or parasympathetic relays (COPS)
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Preganglionic parasympathetic fibers to the pterygopalatino ganglion come from which nerve?
CN VII, come out via greater petrosal nerve, relay at the pterygopalatino fossae and relay at the pterygopalatine ganglion, parasympathetic innvervation everywhere in that area,
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Infrahyoid, superior laryngeal and glandular branches are from which artery?
superior thyroid, provides supply to thyroid and anteiror neck structures
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Nasolacrimal duct is innervated by what and drains where?
Inferior meatus, innervated by CN VII in the lasolacrimal gland
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palatine tonsil and back of oronasal pharynx are supplied by which artery?
ascending pharyngeal
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suprahyoid, dorsal lingual, sublingual and deep lingual are branches of which artery?
Lingual artery
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Palatine tonsil can get blood supply from
Facial artery
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internal carotid and external carotid anastamose where
inferior orbital
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What arteries make the anostomoses of the palate?
Greater palatine (max) and Sphenopalatine (max)
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Which arteries make anostomoses of the soft palate?
Remember LAPD
- Lesser palatine (max)
- Ascending palatine (facial)
- Palatine Artery (ascending pharyndeal)
- Dorsal lingual (lingual)
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which nerves lie within the cavernous sinus?
- 3, 4, v1, v2 and 6
- Bacteria drained inside can cause a clotting cascade and significant issue.
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Which nerve can get strangulated by clots within the cavernous sinus and what happens?
VI, abducens. The lateral rectus muscle abducts the eye, the tone on the muscle stops and the eye will drift across the midline and person gets double vision.
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tip of the tongue and middle of the tongue drain to which lymphnodes?
tip (sublingual), middle/sides (submental)
- Back of the tongue drains to deep lymphatic nodes
- Jugulo-digastric
- Jugular-omohyoid
*Retropharyngeal lymphnodes swell from tumor or nasal cavity infection
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The tonsilar bed receive blood flow from which branches of the external carotid?
- Ascending pharyngeal
- facial artery
- maxillary artery
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The buccal artery is a branch of?
Maxillary artery: has pterygoid (deep temporal, pterygoid, masseteric and buccal) and pterygopalatine branches.
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Middle meningeal artery (mandibular branch of maxillary artery), lies under which landmark in the skull
- Pterion
- Inferior alveolar is another mandibular branch of maxillary artery
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The three divisions of the trigeminal nerve pass through the openings in which bone?
Sphenoid
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All sympathetic nerves of the head and neck relay where?
superior cervical ganglion
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Foramen rotundum connects...
middle cranial fossae to the pterygopalatine fossae
v2 passes through
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the common facial vein is formed by a union of the facial vein and the:
- anterior division of the retromandibular
- ** Posterior division of the retromandibular along with the posterior auricular vein form the External jugular
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Depression of the mandible is accomplished by bilateral contractions of the:
Lateral pterygoid muscles
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Foramen ovale connects which 2 spaces?
middle cranial fossae and infratemporal
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The pterygomaxillary fissure connects which two spaces?
Pterygopalatine and infratemporal fossae
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The pterygoid plexus of veins receives direct input from which of the following veins?
inferior ophthalmic
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The maxillary sinus normally drains into
middle meatus of the nose
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Lymphatic flow from the central posterior 1/3rd of the tongue travels through which lymph node first?
deep cervical
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If onnly chroda tympani wre cut, which function associated with trigeminal would be intact
General sensation from anterior 2/3rd, because chorda tympani is only taste. General sensation comes from lingual nerve of v3
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Parasympathetic fibers to the parotid gland synapse where?
otic ganglion, the nerves originate in cranial nerve IX (glossopharyngeal)
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