Throat Flashcards
What is the anterior cylinder called
Larynx
What is the posterior cylinder
Pharynx
What does larynx continue into?
Larynx-trachea-airway
What does pharynx continue into?
Pharynx- oesophagus
Extension of larynx?
From C3 to C6
What is larynx is made up of?
Muscles in between cartilages
Cartilages of larynx
Total 6
3 paired
3 unpaired
What is the Largest laryngeal cartilage?
Thyroid cartilage
What are the three unpaired cartilages of the larynx?
ETC
Thyroid
Cricoid (ring like)
Epiglottis (leaf like, rises above the glottis)
What are the three paired cartilages of larynx?
CAC
Arytenoid
Cuniform
Corniculate
Which cartilage does not ossify with age?
Elastic cartilages:
Epiglottis will never ossify
Cuniform and corniculate aswell but they are rudimentary so not that important.
What are the hyaline cartilage of larynx ?
CAT
Thyroid
arytenoid
Cricoid
What are Vocal cords made up of?
Anterior 2/3rd membranous
Posterior 1/3rd cartilaginous
Which cartilages make posterior one third of vocal cords?
Arytenoid Cartlidge
What are pharyngeal arches made up of?
Mesoderm
(4 and 6.
5th obliterates)
4th pharyngeal arch structures?
3 cartilages.
CuTE
Cuniform
Thyroid
Epiglottis
+
ALL pharyngeal muscles EXCEPT stylopharyngeous muscle
+
All extrinsic muscles of larynx
+
superior laryngeal nerve
From which arch stylopharyngeus muscle is made of?
Third arch
What are the two nerves that supply the larynx?
Superior laryngeal nerve (SLN)
Recurrent laryngeal nerve (RLN)
6th pharyngeal arch structures?
CAC cartilages
Cricoid
Arytenoid
Coniculate
+
ALL intrinsic muscles of larynx EXCEPT cricothyroid muscle
+
Recurrent laryngeal nerve
From which arch does cricothyroid muscle develop from?
4th pharyngeal arch
What are the three pharyngeal constrictor muscles?
Superior, middle and inferior constrictor muscles

All supplied by vagus nerve
All Present Retropharyngeal
All muscles of the pharynx are supplied by vagus nerve, except which muscle?
Stylopharyngeus
innervated by the glossopharyngeal nerve CN9
What is Torus Tubarius?
It is an area of cartilage covered in mucosa raised above the auditory tube present in the nasopharynx
What is pharyngeal plexus composed of?
CN8, CN9 and sympathetic fibres
Nerve supply of pharyngeal muscles
Vagus nerve- All muscles *except *
Stylopharyngeous- CN9
Tensor veli palatini- Mandibular div. Of CN5
Blood supply of pharynx
Common carotid artery — external carotid artery — acsending pharyngeal artery
Drained into pharyngeal venous plexus
lymphatic drainage of pharynx
Jugulodigastric nodes (tonsillar nodes)
What is the Adams apple?
It is laryngeal prominence present medially at the spine of the thyroid cartilage
Only complete ring of cartilage in the airway?
Cricoid cartilage
Innervation of larynx- Motor
The larynx is innervated by branches of the vagus nerve (CN X):
Superior laryngeal n.
• External branch - innervates cricothyroid m
Recurrent laryngeal n.
Motor - to all intrinsic muscles of larynx (except cricothyroid m.)
What are the intrinsic muscles of larynx
Adductors Abductors and tensors
Vocalis m. in vocal folds, produces minor adjustments in vocal ligament tension
Arytenoid m. (thyro, inter.) - adduct vocal folds (close glottis)
Posterior cricoarytenoid m. - abduct vocal folds (open glottis)
only muscle that opens the airway!
All innervated by recurrent laryngeal n. except cricothyroid
Lymphatics of larynx
Above vocal folds - superior deep cervical lymph nodes
Below vocal folds - pretracheal or paratracheal lymph nodes, then to inferior deep cervical lymph nodes
Blood supply of larynx
Arteries - branches of superior and inferior thyroid arteries
Superior laryngeal a. branch of superior thyroid a., pierces thyrohyoid membrane
Inferior laryngeal a. - branch of inferior thyroid a., runs with end of recurrent laryngeal n.
Stages of deglutition
• Stage 1 - voluntary, tongue pushes bolus against hard palate into oropharynx
• Stage 2 - involuntary
• Soft palate elevates to close passage into nasopharynx
• Epiglottis closes over larynx
• Stage 3 - pharyngeal constrictors sequentially contract pushing bolus into esophagus, esophagus transports bolus from pharynx to stomach
What is the primary function of larynx?
Primary- protection of lower airways
Secondary- phonation
Process of phonation
Function of the true vocal cords or glottis in adduction position, (closed)
During the exhalation of air
What is puberphonia
Rx
Adult male, having high-pitched voice
Rx- speech therapy initially, (Hey man, have guts) **Gutzmann’s manoeuvre **
For 3 to 6 months
If no improvement
*Surgical management *- type 3 thyroplasty (surgical shortening and loosening of vocal cords)
What is Androphonia
Rx
Adult female with the low pitched voice.
Rx-
direct surgical manoeuvre- type 4 thyroplasty (surgical lengthening and tightening of vocal cords)
What are the two vocal disorders?
Androphonia
Puberphonia
Types of laryngoscopy
- Indirect- using a straight mirror. Done in OPD.
- Direct- using
CURVED BLADE Macintosh in ADULTS
STRAIGHT BLADE miller in infants(peads)
Pt. Is sedated, done in OT Only. Held in non dominant hand.
- Flexible laryngoscope, wire thru the nose.
Indications for direct laryngoscopy
1 intubation
2 biopsy
Male, smoker, presents w hoarseness is voice
Dx
Keratosis larynx OR
Renkies edema
Normal lining of larynx
Pseudostratified ciliated, columnar epithelium
Normal lining of the vocal chords
Stratified squamous epithelium
What is ketosis larynx?
In smokers, the epithelium lining the vocal cords sheds at a faster rate. Therefore, there is hoarseness a voice, 
Ketosis larynx Rx
Decortication + quit smoking
Patient with complains of weak and breathy voice
Laryngoscopic examination shows keyhole gap incomplete closure of vocal cords even after complete adduction (elliptical gap)
Phonaesthenia
Phonaesthenia
Patho physio
Rx
Muscles of adduction- thyroarytenoid TA and interarytenoid IA weakness/ paralysis
Causing some gap
Both muscles- keyhole gap
TA only- elliptical gap
Rx- speech therapy
Chronic smoker
Hx of hoarseness
Laryngoscopy shows swelling of vocal cords
Dx
Rx
Reinke’s edema
Collection of fluid in the reinkes space of the VC.
(Space Bw the mucosa and vocal ligament)
RISK FACTOR - smoking
Rx. Of choice- decortication (same as keratosis larynx)
Laryngeal web
Rx
-Congenital anomaly
Extra tissue bw the VC
-Most common site is glottis
child with hoarse cry
RX.
- CO2 laser excision
Subglottic stenosis types
1 Congenital
Child, born with a smaller lumen
2 Acquired
Recurrent infections, causing inflammation, causing oedema, leading to stenosis
Subglottic stenosis grading
Cotton myele grading
Grade 1 and 2 (0-70)
conservative
Grade 3 and 4 (70-100)
surgical- LTR laryngotracheal reconstruction
Trumpet player presents to OPD with complain of neck swelling. on pressing swelling, hissing sound is noted.
X-ray soft tissue neck shows air filled swelling
CT same
Laryngocele
Hissing sound on pressing swelling
Bryce sign
Laryngocele
Dx
Rx
Abnormal dilation of saccule
In wind instrument players mostly or weight lifters
Do X-ray soft tissue neck with VALSALVA MANOEUVRE
Rx- surgical excision
Levels of neck
- Submental + submandibular
- Upper deep cervical
- Middle deep cervical
- Lower deep cervical
- Supraclavicular
- Prelaryngeal/pretracheal/delphian
- Mediastinal
Lymphatic drainage of supraglottis
Level 2 and 3
Upper and middle deep cervical lymph nodes
Subglottis lymph drainage
Level 6 LN (pretracheal)
Glottis lymph nodes
No lymphatics
Best prognosis cause no mets
Intoxicated pt having meal, chokes, difficulty swallowing, respiratory distress, can’t speak anything
Rx
Rx- heimlichs manoeuvre
Paediatric larynx
Position- high, C2-C3
Shape- funnel shaped
Narrowest part- subglottis
Edema- high due to more loose areolar tissue
Adult larynx
Position- low C3-C6
Shape- cylinder shaped
Nastiest part- glottis
Edema- low
Only abductor muscle of larynx (opens)
Posterior cricoarytenoid muscle
Adductor muscles of larynx
4
Thyroarytenoid
Interarytenoid
Lateral cricoarytenoid
Cricothyroid
Tensor muscles of larynx
Main- cricothyroid
And vocalis
(Thyroarytenoid muscle also as vocalis is the internal part of it)
Responsible for quality of voice
Only unpaired muscle of larynx
Interarytenoid muscle
Also called transverse muscle
Innervation of larynx- sensory
Glottis- SLN and RLN
Supraglottis- internal branch of SLN (ILN)
Subglottis- RLN
Pt underwent thyroid surgery. after surgery, He has poor quality of voice and recurrent aspiration. What is the likely cause?
SLN injury
Injury to SLN
Aspiration and poor voice quality
❌ external laryngeal nerve— motor nerve supply to cricothyroid muscle — poor quality of voice as it is a tensor muscle
❌ internal laryngeal nerve — sensory nerve supply to supraglottis — ❌ cough reflex leading to aspiration
Vocal cord paralysis
More commonly left sided palsy
4:1 ratio
Because left RLN has a longer course (till middle of thorax a rough arch of aorta)
MCC of unilateral palsy-
1. Ideopathic
2. Carcinoma bronchus
MCC of bilateral palsy-
1. Iatrogenic trauma (thyroidectomy)
Which nerve injury more common during thyroid surgery
SLN injury
Pt. W c/o hoarseness of voice and it was found left atriomegaly is causing compression of left RLN. What is Dx?
Ortner’s syndrome
RLN palsy
Pt. After thyroid surgery, having respiratory distress and stridor.
What is Dx?
Bilateral abductor palsy
POSTERIOR CRICOARYTENOID MUSCLE PALSY
due to bilateral RLN injury
Vocal cords are closed causing distress and strider in pt.
B/L RLN injury
Rx
Emergency- tracheostomy
Definitive- type 2 thyroplasty
(Lateralisation of vocal cords)
Pt. With c/o Aphonia and aspiration pneumonia
Dx.
Bilateral vagal paralysis
b/l RLN SLN injury causing
Bilateral ADDUCTOR palsy
Vocal cords in the cadaveric / open/ intermediate position.