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Nbcrna Questions And Correct Answers Latest Version 2024
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Nbcrna Questions And Correct Answers Latest Version 2024
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Nbcrna Questions And Correct Answers LatestVersion 2024
What muscle abducts the vocal cords? Answer: posterior cricoarytenoid
What is the only muscle that tenses (elongates) the vocal cords? Answer: cricothyroid "cords tense"
What muscle opens the glottis? Answer: thyroepiglottic
What two muscles close the glottis? Answer: aryepiglottic
oblique arytenoid
What muscles adduct the vocal cords and arytenoids?
- there are two Answer: lateral cricoarytenoid
transverse arytenoid
What muscle shortens the vocal cords? (relaxes?)
- there are two Answer: thyroarytenoid "they relax"
vocalis
The cricothyroid muscle is innervated by? Answer: external branch of SLN
- the only branch that tenses (elongates) the VCs
The internal branch of the SLN is purely?
- sensory or motor? Answer: sensory
,Recurrent laryngeal innervates... Answer: below vocal cords --> the trachea
Branches off vagus in thorax
Motor: all intrinsic except cricothyroid
Glossopharyngeal innervates... Answer: the vallecula
topside of epiglottis
soft palate
oropharynx
post 1/3 of tongue
tonsils
*afferent limb of gag reflex*
CN IX - sensory
Superior laryngeal innervates... Answer: posterior epiglottis --> vocal cords
Internal branch is sensory - underside of epiglottis
External branch is motor - cricothyroid muscle
Trigeminal (V) V3 innervates... Answer: anterior 2/3 tongue
Trigeminal nerve (V) contains what 3 branches? Answer: V1 ophthalmic (anterior ethmoidal) -
nares/ant 1/3 septum
V2 maxillary (sphenopalatine) - turbinates/septum
V3 Mandibular (lingual)
,Superior laryngeal nerve block: Answer: 3ml at the inferior aspect of the greater cornu of hyoid
bone bilaterally
- helps tolerate FO intubation once past the oropharynx
Glossopharyngeal block: Answer: 1-2 ml at the tonsillar pillar bilaterally
Transtracheal block: Answer: 3-5 ml through the cricothyroid membrane
What is most likely to injure the left RLN while sparing the right RLN? Answer: Mitral stenosis (LA
enlargement compresses the nerve and may present as hoarseness)
PDA ligation
Aortic arch aneurysm
Thoracic tumor
Causes of left OR right RLN injury: Answer: parathyroid or thyroid surgery
external pressure from LMA/ETT
neck tumor
neck extension
Where does the right RLN loop?
left RLN loop? Answer: under the right subclavian artery
- left under the aorta (more susceptible to injury)
For the patient in sitting position, order the cartilages from superior to inferior:
cricoid
epiglottis
, arytenoid
corniculate Answer: epiglottis
corniculate
arytenoid
cricoid
How many unpaired cartilages present in the larynx?
Paired? Answer: 3 unpaired
3 paired
9 cartilages total
Where is the adult larynx located?
Infant larynx? Answer: C3-C6
Infant is C2-C4
What is the narrowest part of the airway? adult/infant Answer: Vocal cords for adult
Cricoid for infant, if paralyzed = vocal cords
Risk factors for intraoperative laryngospasm? Answer: GERD
Exposure to 2nd hand smoke
recent URI
Age < 1 year
HYPOcapnia
light anesthesia
saliva or blood in the upper airway
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