Mixed Motor Nerves Flashcards
What nerve is CN V
Trigeminal
What division is V1?
Opthalmic division of Trigeminal
Function on V1?
somatic sensory: sensory from skin of forehead, scalp, mucous membranes (nasal)
What is the location on NCB of V1?
Trigeminal (semilunar) ganglion
Where does V1 pass through the skull?
Superior Orbital Fissure
Injury to V1 causes what?
Anesthesia (loss of pain and touch) in areas of skin of forehead/mucous membranes of scalp d/t inflammation
What branch is V2?
Maxillary branch
Function of V2
Maxillary brach is somatic sensory: of upper lip, skin over cheek, palate and maxillary sinus
Location of NCB of Maxillary branch V2
Trigeminal ganglion
How does V2 pass through skull?
Foramen rotundum on sphenoid bone
Loss of pain/touch to the skin over cheek, upper lip or palate?
Maxillary branch; V2
Damage to what nerve causes Trigeminal neuraglia or Tic Douloureux = intermittent excructiating pain
Maxillary branch V2~ d/t inflammation
What branch is V3?
Mandibular: sensory and motor
Function of V3?
Somatic Sensory: skin over jaw, and mucosa on anterior 2/3 of tongue
Branchial Motor: chewing and swallowing
Location of NCB of sensory portion of V3
Trigeminal ganglion
V3 sensory portion passes through the skull
sphenoid bone–foramen ovale
Loss of pain/touch to skin on lower jaw or anterior 2/3 of tongue
V3 sensory of Mandibular d/t inflammation
Location of motor NCB of V3
Pons- motor nucleus of V
Motor portion of V3 goes through skull:
foramen ovale–sphenoid bone
What structures are innervated by motor division of V3?
Muscles of mastication: temporalis, lateral and medial pterygoids, masseter tensor vili palatini tensor tympani mylohyoid Digastric (anterior belly)
Muscles of mastication: temporalis, lateral and medial pterygoids
V3–motor portion of Mandibular
Masseter muscle innervation
V3–motor portion of Mandibular
Tensor vili Palatini
V3–motor portion of mandibular
Tensor Tympani
V3–motor portion of mandibular
Mylohyoid
V3–motor portion of mandibular
Digastric
V3–motor portion of mandibular
CC: difficulty chewing is due to damage where?
V3 motor portion of mandibular nerve– b/c of inflammation issues
Cranial nerve VII
Facial nerve
CN VII functions
Somatic Sensory: skin behind ear, external acoustic meatus and tympanic membrane (external surface)
Special Sensory: taste from anterior 2/3 of tongue and taste from palate
Branchial motor: facial expression
Branchial motor: facial expression d/t
CN VII
Skin behind ear, external acoustic meatus and tympanic membrane
CN VII
Branchial motor function
CN VII
Location of NCB of VII Somatic Sensory
Genicular ganglion
Passage through skull for Somatic Sensory VII
Temporal bone: internal acoustic meatus and exits stylomastoid foramen
Loss of taste sensation from anterior 2/3 of tongue d/t
CN VII deficite to special sensory
–> d/t injury chorda tympani
Loss of sensation between skin behind ear, external acoustic meatus, tympanic membrane
CN VII deficite to somatic sensory
Location of NCB for Special Sensory of VII
Geniculate ganglion
VII Special Sensory passes through skull
Temporal bone: entry– internal acoustic meatus
exits via petrotypmpanic fissure
VII Brachial Motor division functions
Facial expression
Location of NCB of branchial division of VII
Pons–Motor nucleus of VII
Branchial division of VII passes through skull
Temporal bone: enters internal acoustic meatus
exits: stylomastoid foramen
What are the 5 terminal branches of Brachial division of Facial nerve VII
Temporal Zygomatic Buccal Mandibular Cervical
Muscles of facial expression
Platysma buccinator Frontalis Occipitalis Orbicularis Oculi *Innervated by Branchial motor of VII
Stapedius/Stylohyoid/ Digastric (posterior) / facial muscles innervated by:
Branchial Motor of VII
Symptoms of Bells Palsy
Facial muscle paralysis
Can’t close eyes (orbicularis oculi out)
Angle of mouth drops (paralysis of m. around mouth)
Forehead doesn’t wrinkle (due to paralysis of frontalis)
**Only applies to peripheral lesions only bc frontalis m is bilaterally innervated
Bells palsy caused by which nerve deficiet?
Branchial motor of Facial VII
Injury to region of parotid gland causes what type of damage
usually distal to stylomastoid foramen– CN VII~ Bell’s Palsy
