Larynx III - Intrinsic Muscles, Innervation & Cord Movement Flashcards
what are the principle actions associated with the RLN (Recurrent Laryngeal Nerves)?
aDduction of vocal cords
aBduction of vocal cords
shortening vocal cords
Serve all the intrinisic muscles EXCEPT the Cricothyroid muscles
What is the principle actions associated with the the Superior Laryngeal Nerves (SLN)?
tensing the vocal cords
ONLY serves 1 set of muscles — the Cricothyroid muscles
what cranial nerve supplies the RLN and SLN
CN X (vagus)
All of the Intrinsic Laryngeal muscles are paired EXCEPT _________
A) Oblique Arytenoid
B) Cricothyroid
C) Vocalis
D) Transverse Arytenoid
D) Transverse Arytenoid
is a single muscle
Which 3 intrinsic laryngeal muscles work as aDductors
- lateral cricoarytenoid
- oblique arytenoid
- transverse arytenoid
Which two intrinsic laryngeal muscles are responsible for shortening the vocal cords ?
- thyroarytenoid
- vocalis
Which intrinsic laryngeal muscles aBduct the vocal cords?
Posterior cricoarytenoid
Which intrinsic laryngeal muscle tense the vocal cords?
criocothyoid
Which intrinsic laryngeal muscles close the glottis?
- aryepiglottic
- thyroepiglottic
Identify the numbered structures
- aryepiglottic m. (oblique arytenoid to latteral epiglottis)
- oblique and transervse arytenoid m.m.
- posterior crico-arytenoid m.
- crico-thyroid m. (cut)
- thyro-epiglottic m.
- thyro-arytenoid m.
- lateral crico-arytenoid m.
Identify the numbered structures
- cuneiform tubercle
- corniculate tubercle
- aryepglottic m.
- oblique arytenoid m.
- thransverse arytenoid m.
- posterior crico-arytenoid m.
- cricoid cartilage
What muscle and what action performed ?
posterior cricoarytenoid
aBduct
What muscles and what actions ?
Lateral cricoarytenoid m.m.
aDduct
what muscle and what action
transverse arytenoid
aDduct
What structures provide a spring like action that helps reopen the vocal cords?
cuneiform and corniculate cartilages
Identify the number structures
- cricothyroid m.
- thyroarytenoid m.
- vocalis m.
- vocal ligaments
What causes the scalloped wavey look of the vocal ligaments?
when the vocalis and thyroarytenoids contract
Identify numbered structures and actions
- oblique belly of cricothyroid m.
- vertical belly of cricothyroid m.
work to lift up and backwards the cricoid cartilage to tense the vocal cords
Which muscle works to oppose the aDduct action of the lateral cricoarytenoid, oblique arytenoid, and transverse arytenoid m.m.?
Posterior cricoarytenoid m.m. to aBduct
which muslce works to oppose the vocal cord shortening actions of the vocalis and thyroarytenoid m.m.?
the cricothyroid m. tenses the vocal cords
Which nerve wraps around the subclavian artery?
Right RLN
Remember:
the Right RNL Raps Round the Right subclavian artery
which nerve wraps around the aortic arch?
Left RLN
Which branch of the SNL pierces the thyrohyoid membrane?
the internal branch
provides Sensory to supraglotic region
which branch of the SLN provides motor fibers to the cricothyroid muscles?
External branch
Which nerve provides motor fibers to the cricothyroid and sensory fibers to the supraglottic (vocal cords and up) region?
SLN
Which nerve provides motor fibers to all intrinsic laryngeal m.m. (except cricothyroids) and sensory to the infraglottic (vocal cords and down)?
RLN
