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Eckel CNV & VII

Origin of CN V nuclei Nuclei are located in the pons and they emerge from the pons LATERALLY
Two emerging roots of CNV 1.Sensory: (Big) Major sensory nerve of the face. 2.Motor: (Small) innervates the muscles of mastication, anterior digastric, mylohyoid, tensor veli palatini, tensor tympani
Three division of CN V 1. Opthalmic (Exits thru Sup. Orbital Fissure). 2.Maxillary (Exits thru foramen rotundum). 3.Mandibular (Exits thru foramen ovale).
Where is the Trigeminal ganglion located Both Motor and sensory roots form the ganglia in the Middle cranial fossa. This is also the exit sites for V1, V2, V3 from the ganglia. **it is equivalent to the posterior root ganglia
Branches of the Opthalmic division: Frontal N forms in the orbit, is the most superior branch of V1. Splits into Supra-orbital(L) and Supratemporal(M) nerves which exit the orbit superiorly and are the lateral and medial cutaneous nerves for the scalp
Branches of the Opthalmic division: Lacrimal N Smallest of the branches. Runs superolaterally through the orbit. Recieves secretomotor fibers from zygomaticotemporal N which act on the lacrimal gland. It is sensory for the area of skin of lateral superior eyelid.
Branches of the Opthalmic division: Nasociliary N Deep in the orbit. Gives rise to: 1.Infratrochlear: passes infeior to trochlea on medial wall to innervate skin lateral to root of nose/ medial eyelids. 2.External Nasal: Emerges from nasal cavity to innervate the dorsum,ala,vestibule, apex of nose
Branches of the Maxillary division: Zygomatic N formed in the ptergyopalatine fossa. Forms: 1.Zygomaticofacial: goes thru zyg.fac. canal to inferiolat orbit to innv. the cheek. 2.Zyo.temporal: passes thru the zygo.temp. canal in temp bone to temporal fossa. Innv. hairless skin of ant. temp. fossa.
Zygomaticotemporal also give off a branch to: the lacrimal N. it is a secretomotor communicating branch.
Branches of the Maxillary division: Superior Alveolar N Gives off a Ant, middle, and post superior alveolar branch that for the root of the upper teeth as well as innervates the palate.
Branches of the Maxillary division: Infra-orbital N Exits via infraorbital foramen. Forms: 1.Inferior palpebral: skin/conjunctiva of inferior eyelid. 2.Lateral Nasal: lateral nose/anteroinferior nasal septum. 3.Superior Labial: Skin and mucosa of upper lip
4 major nerve branches of Maxillary N (V2) 1.Infra-orbital N. 2.Zygomatic N. 3.Superior Alveolar N. 4.Palatine N (Greater and lesser)
Mandibular Division (V3) Contains BOTH sensory and motor fibers. Innervates: 1.Muscles of mastication. 2.Tensor tympani. 3.Tensor veli palatini. 4.Anterior Digastric. 5.Mylohyoid. 6. Skin over chin, lower lip, mandible, and ear.
Major Branches of Mandibular N (V3) 1.Auriculotemporal N. 2.Inferior Alveolar N. 3.N. to Mylohyoid. 4.Lingual. (GSA of tongue) 5.Buccal.
Buccal N (Mandibular Branch) Originates in the infratemporal fossa and pass b/w the lateral pterygoids, emerging anteriorly from the ramus of the mandible and masseter. It connects with the Buccal branch of the facial N. **Cutaneous nerve for skin and oral mucosa of cheek
Auriculotemporal N (Mandibular Branch) Originates in the infratemporal fossa and passes posteriorly deep to ramus of mandible, superior to parotid gland. Emerges posterior to TMJ. Cutaneous nerve for auricle/Ant ear and posterior 2/3 of temporal region.
Inferior Alveolar N (Mandibular Branch) Enters the Mandible via the Mandibular foramen. serves as the roots of inferior teeth (dentists numb this nerve). Forms the Mental N when it exits the mental foramen (Cutaneous N for chin and lower lip).
Parasympathetics associated with CN V All the ANS parasymp. ride along with the divisions of CN V. 4 ganglia: ciliary, otic, submandibular, and pterygopalatine
Lesions of CN V loss of light touch, pain, and heat sensation. Paralysis of muscles of mastication (**chin will point to side of lesion). Loss of afferent limb of corneal reflex (both eyes blink).
Trigeminal Neuralgia Disorder in sensory root of CN V. sudden attacks of excruciating facial pain lasting up to 15 min. V2 is the most commonly affected CN V branch. **May be cause by compression from aberrant BL vessels
Locatoin of CN VII's nucleus Located in the Pons and emerges between the pons and brainstem.
Geniculate ganglion Ganglion of CN VII Facial N where the motor and sensory roots merge. **Equivalent to the posterior root ganglion.
CN VII Motor fiber innervate? Major part of CN VII. Innervate: 1.Muscles of Facial expression. 2.Posterior Digastric. 3.Stapedius (ear). 4.Stylohoid (pharynx).
Pathway of CN VII to exit the skull Internal auditory meatus -> Facial canal (within the temporal bone) -> geniculate ganglion -> Stylomastoid foramen
CN VII gives rise to ? in within the facial canal 1.Greater Petrosal N. 2.Chondra tympani N. 3.N. to Stapedius M.
Chondra Tympani N. branches from CN VII within the facial canal. jumps on the lingual N to the tongue. Sensory taste (SA) for anterior 2/3 of tongue, submandibular gland, sublingual gland (**since the lingual N passes just superior to them)
Parasympathetics involved in Chondra Tympani N. Carries Pre (GVE) and postgang.(GVA) parasymp fibers to submandibular glad. Also carries Postgang. (GVA) parasymp. fibers to sublingual gland.
Greater Petrosal N. Carries preganglionic (GVE) parasymp. fibers to pterygopalatine ganglion.
Postganglionic parasympathetic targets of Pterygopalatine ganglion After recieving pregang. fibers from the Greater petrosal N, it targets: 1.lacrimal gland. 2.mucous glands of palate. 3.mucous glands of maxillary. 4.mucous glands of sinus. 5.mucous glands of nasal cavity.
branch of the Facial N (CN VII) that comes after immediately after the stylomastoid foramen? Posterior Auricular N. (Cutaneous to parietal region).
Branches of CN VII that exit from the Parotid gland 1.Temporal. 2.Zygomatic. 3.Buccal. 4.Mandibular. 5.Cervical.
Does CN VII innervate the parotid gland? NOOOO, glossopharyngeal (IX)
Bell's Palsy most common cause of a lesion near the stylomastoid foramen causing paralysis of the facial expression muscles on THAT side. Can also see decreased glandular secretions. **Loss of EFFERENT limb of the corneal reflex.
Testing the Corneal Reflex: If One eye doesn't blink? There is a problem with the Motor reflex arm (Facial N). Confirm by then testing Orbicularis Oculi. If they cant blink one eye at a time, then there is a lesion on the Facial N.
Testing the Corneal Reflex: If neither eye blinks? There is a lesion on the Trigeminal N. and the sensory arm of the reflex is damaged.
Created by: WeeG



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