Cranial Nerves V And VII

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Cranial Nerves V And VII

Review For Te St #1

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CN V is also called the ______
trigeminal nerve
The three main divisions of the trigeminal nerve are:
Opthalmic (V1), maxillary (Vii) and mandibular (Viii)
Three divisions of trigeminal arise from
the trigeminal ganglion
The trigeminal provides senesory sensation to
most of the dura matter and cerebral arteries
The opthalmic division is purely _____
The opthalmic division provides sensory information to:
Eyeball (cornea blink); skin and forehead of scalp (upper part of nasal cavity)
The maxillary division is purely _______
The maxillary division (Vii) provides sensory input to:
upper jaw and teeth; maxillary paranasal sinus; hard and soft palates; nasal cavity; skin of lower eyelid & cheeks; upper lip
The mandibular division contains both _____ and ____ components
sensory and motor
Three main branches of the mandibular division are:
lingual, inferior alveolar, buccal
Lingual branch of mandibular division function:
sensory to anterior 2/3 of tongue; joined by chorda tympani branch of facial nerve which carries taste sensation from the anterior 2/3 of tongue
Inferior alveolar branch of the mandibular division function:
sensory to lower jaw and teeth and gums
Buccal branch of the mandibular division function:
sensory to skin of cheek
Trigeminal provides motor innervation to:
muscles of mastication: a) temporalis (b) masseter (c) medial pterygoid (d) lateral pterygoid (2) tensor tympani m. (3) Other muscles
The trigeminal nucleus is the main _______
sensory nucleus
The trigenminal nucleus receives information containing:
discriminative touch and some proprioception from the head
The trigeminal nuclei is equivalent to the:
dorsal column nuclei of the spinal cord
Axons carrying  pain and temperature information  descend in the ______  as far as the upper 2 or 3 spinal cord segments;
spinal trigeminal
Axons carrying pain and temp. info  terminate in the subjacent ________
spinal trigeminal nucleus
The spinal nucleus and tract of CN V are equivalent to _________________ of the spinal cord
the substantia gelatinosa and Lissauer�s tract of the spinal cord
Spinal trigeminal nucleus also receives pain information from
CNs VII, IX and X
Efferent axons from trigeminal  nucleus join the crossed ventral ______ and end in the thalamus
trigeminothalamic tract
Cells in the mesenphalic nucleus are involved with ______ and are equivalent to________
proprioception; dorsal root ganglion cells
The mesenphalic nucleus is involved with :
processing information from muscle spindles of muscles of mastication
Muscles of mastication are involved with the _______ reflex
jaw jerk
The motor nucleus of trigeminal nerve supplies the  muscles of _____
medial and lateral pterygoids, masseter and temporalis, and also tensor tympani, tensor veli palatini, mylohyoid and anterior digastric
Clincal testing for trigeminal nerve (CN V) includes:
Testing for skin sensation in forhead (Vi), cheek (Vii) and chin (Viii); corneal blink reflex (wisp of cotton); p[alpating masseter and tempralis while asking patient to clench jaw (Viii)
Trigeminal is responsible for the ___ component of the corneal blink reflex
The most common affliction affecting CNV is______
Trigeminal neulagia or tic doloreux
Effect of tic doloreux
Causes excruciating pain in one of the areas usually maxillary
Cause of tic doloreaux
Aberrant artery putting pressure on the sensory root as it leaves the pons
CN VII is also known as the _____
Facial nerve
___ is the largest nerve in the face
CN VII (facial nerve)
CN VII enters the temporal bone via
internal acoustic meatus
CN VII has its sensory ganglion in the ___
temporal bone
The facial nerve gives rise to three bluranches in the facial canal that includes:
Greater petrosal, nerve to stapedius muscle, chorda tympani
Function of greater petrosal
carries parasympathetic fibers destined for the sphenopalatine ganglion and ultimately the lacrimal gland
function of chorda tympani
carries taste and parasympathetic fibers
The major portion of CN VII exits via _____
stylomastoid formaen
The facial nerve controls the muscles of ______
fascial expression
orbicularis oculi
Muscle which closes the eye
orbiculis oris
sphincter of the oral cavity
Function of stapedius
contracts with loud sounds to dampen vibrations - protection of the auditory ossicles (stapedial reflex); reflex can be tested
The parasympathetic components of the facial nerve include
lacrimal glands, sabmandivular and sublingual salivary glands
The special sensory component of the facial nerve deals with
taste on the anterrior 2/3 of tounge
Nuclei of CN VII include
Motor nuceli, nucleus solitarius and parasympathetic nuceli
The nuclues solitarius receives _____ information from CN IV (IX and X)
The rostral or taste portion of nucleus solitarius is called
gustatory nucleus
CN VII is the ____ component of the ___ reflex
motor; corneal blink
Testing of CN VII includes
movement of facial muslces; taste; corneal blink
Bell's palsy is a ________ injury of CN VII
lower motor nueron
Bell's palsy is usually caused by
edema; perhaps as a result of viral infection
The _________ muscles are affected if Bell's palsy occurs at stylomastoid foramen
Effect if Bell's pasly occurs proximal to the geniculate ganglion
All functions of the nerve
Each facial muscle and facila nerve supplies ipsi/contra lateral facial msucles
A lower motor neuron deficit involves which muscles?
muscles of the ipsilateral half of the face (hemiface)
Typical site of injury for an upper motor neuron injury
stroke affecting the facial area of motor cortex or the genu and posterior limb of internal capsule
These fibers supply the facial nucleus
Corticobulbar (corticopontine or corticonuclear)
The facial nucleus from the lower face receives corticofibers from ________
the contralateral cortex
The facial nucleus for the upper face receives cortcofibers from ______
both sides of the cortex (bilateral projections)
An upper motor neuron lesion produces _______
paralysis on only the lower quandrant of one side of the face