Question 1

End tracheostomy is performed in patients undergoing surgery for which of the following conditions?

Accepted Answer

Laryngectomy. **Explanation:**

**1. Why Laryngectomy is Correct:**
An **End Tracheostomy** (also known as a permanent tracheostomy) is performed when the entire larynx is surgically removed (Total Laryngectomy). In this procedure, the distal tracheal stump is brought out to the skin of the neck and sutured to the margins of the skin incision. This creates a permanent stoma where the airway is completely separated from the pharynx and esophagus. Since the larynx (the connection between the upper and lower airway) is gone, the patient breathes exclusively through this stoma for the rest of their life.

**2. Why Other Options are Incorrect:**
*   **Laryngofissure surgery:** This is a thyrotomy where the larynx is opened to access the vocal cords. It usually requires a **temporary/prolonged tracheostomy** to maintain the airway during postoperative edema, but the larynx remains intact.
*   **Oropharyngeal growth:** These patients may require a **temporary tracheostomy** to bypass an upper airway obstruction or for anesthesia access, but the tracheal opening is not permanent.
*   **Obstructive Sleep Apnea (OSA) with stridor:** Tracheostomy is a treatment of last resort for OSA. It is a **temporary/permanent-in-situ** tracheostomy (the larynx is preserved), not an "End" tracheostomy.

**3. Clinical Pearls for NEET-PG:**
*   **End vs. Side Tracheostomy:** In an "End" tracheostomy, the trachea is severed and the end is brought to the skin. In a standard "Side" tracheostomy, an opening is made in the anterior wall of the trachea while the rest of the airway remains in continuity.
*   **Post-Laryngectomy:** Because the airway and food passage are separated, these patients **cannot aspirate** through the stoma, but they also cannot perform a Valsalva maneuver effectively.
*   **High-Yield Fact:** The most common indication for Total Laryngectomy (and thus End Tracheostomy) is advanced (T3/T4) Squamous Cell Carcinoma of the larynx. [Practice more ENT questions on OnCourse]

Question 2

Mild hoarseness with stridor is seen in:

Accepted Answer

Bilateral abductor palsy. ### Explanation

The clinical presentation of **Bilateral Abductor Palsy** (usually due to injury to both recurrent laryngeal nerves) is characterized by the vocal cords being fixed in the **median or paramedian position**.

1.  **Why the correct answer is right:**
    In bilateral abductor palsy, the vocal cords cannot move away from the midline. Because the cords are positioned very close to each other, the **glottic airway is severely compromised**, leading to inspiratory **stridor**. However, because the cords are in a near-normal position for phonation (close together), the **voice remains remarkably good or only mildly hoarse**. This "good voice but poor airway" paradox is a classic diagnostic hallmark.

2.  **Why the incorrect options are wrong:**
    *   **Unilateral abductor palsy:** Usually presents with mild hoarseness or breathiness, but the unaffected cord compensates. Stridor is typically absent because the airway remains adequate.
    *   **Laryngomalacia:** The most common cause of congenital stridor. It presents with an inspiratory "crowing" sound that improves when the infant is prone. Hoarseness is not a feature as the vocal cords function normally.
    *   **Tracheal stenosis:** Presents with biphasic stridor and dyspnea. Since the pathology is below the level of the larynx, the voice is typically normal unless there is associated glottic involvement.

### Clinical Pearls for NEET-PG:
*   **Most common cause** of bilateral abductor palsy: Thyroid surgery (injury to bilateral Recurrent Laryngeal Nerves).
*   **Management:** Emergency tracheostomy is often required to secure the airway, followed by permanent procedures like lateralization of the cord (Woodman’s operation) or posterior cordotomy.
*   **Semon’s Law:** States that in progressive lesions of the recurrent laryngeal nerve, the abductor fibers are affected before the adductor fibers. [Practice more ENT questions on OnCourse]

Question 3

Which muscle arises from the 4th pharyngeal arch?

Accepted Answer

Cricothyroid. **Explanation:**

The pharyngeal (branchial) arches are fundamental to head and neck development. Each arch is associated with a specific cranial nerve and specific muscular derivatives.

**1. Why Cricothyroid is Correct:**
The **4th pharyngeal arch** is innervated by the **Superior Laryngeal Nerve (SLN)**, a branch of the Vagus nerve (CN X). The **Cricothyroid muscle** is the only muscle of the larynx derived from the 4th arch and, consequently, the only laryngeal muscle supplied by the external branch of the SLN. Its primary function is to tense the vocal cords.

**2. Why the Other Options are Incorrect:**
*   **Options B, C, and D (Cricoarytenoid, Posterior cricoarytenoid, and Thyroarytenoid):** These are all intrinsic muscles of the larynx. All intrinsic muscles of the larynx—**except the cricothyroid**—are derived from the **6th pharyngeal arch**.
*   The 6th arch is innervated by the **Recurrent Laryngeal Nerve (RLN)**, which is why these muscles are paralyzed in cases of RLN injury.

**3. High-Yield Facts for NEET-PG:**
*   **Nerve Supply Rule:** 4th Arch = Superior Laryngeal Nerve; 6th Arch = Recurrent Laryngeal Nerve.
*   **The "Tenser":** The Cricothyroid is known as the "tenser" of the vocal cords. Damage to the SLN leads to a loss of high-pitched voice.
*   **The "Safety Muscle":** The Posterior Cricoarytenoid (6th arch) is the only **abductor** of the vocal cords; its paralysis leads to airway obstruction.
*   **Skeletal Derivatives:** The 4th arch contributes to the thyroid cartilage, while the 6th arch contributes to the cricoid and arytenoid cartilages. [Practice more ENT questions on OnCourse]

Question 4

A middle-aged male presents with a 2-year history of hoarseness and a 30-year smoking history. Examination reveals a reddish area of mucosal irregularity over a portion of both vocal cords. Which of the following is NOT indicated in the management?

Accepted Answer

Bilateral cordectomy. ### Explanation

The clinical presentation describes **Vocal Cord Leukoplakia/Erythroplakia**, which are premalignant lesions (keratosis with dysplasia) often associated with chronic irritation from smoking.

#### Why "Bilateral Cordectomy" is NOT indicated:
A **cordectomy** (excision of the vocal cord) is a radical surgical procedure used for confirmed early-stage laryngeal malignancy (T1a glottic cancer). Performing a bilateral cordectomy for a lesion that has not yet been histologically confirmed as invasive cancer is inappropriate. Furthermore, bilateral cordectomy results in severe, permanent dysphonia and potential airway compromise due to scarring (web formation), making it an overly aggressive and incorrect initial management step.

#### Analysis of Other Options:
*   **Cessation of smoking:** This is the most critical conservative step. Smoking is the primary etiological factor; stopping it can sometimes lead to the regression of dysplastic changes.
*   **Microlaryngeal surgery (MLS) for biopsy:** This is the **gold standard for diagnosis**. Any suspicious mucosal irregularity must be biopsied to rule out invasive squamous cell carcinoma and to grade the degree of dysplasia.
*   **Regular follow-up:** Premalignant lesions of the larynx carry a significant risk of transformation into carcinoma. Even after biopsy or excision, close surveillance is mandatory to detect recurrence or progression.

#### NEET-PG High-Yield Pearls:
*   **Pre-cancerous lesions of Larynx:** Leukoplakia (white patch), Erythroplakia (red patch), and Chronic Hypertrophic Laryngitis.
*   **Management Protocol:** Stop irritants (smoking/alcohol) → MLS with excisional biopsy (stripping of the vocal cord) → Histopathological examination → Long-term follow-up.
*   **Cordectomy Indications:** Primarily indicated for **T1a Squamous Cell Carcinoma** of the glottis. It is never the first step for unconfirmed mucosal irregularities. [Practice more ENT questions on OnCourse]

Question 5

What is the sensory nerve supply above the level of the vocal cords?

Accepted Answer

Superior laryngeal nerve. **Explanation:**

The sensory innervation of the larynx is divided into two distinct zones by the **vocal cords**, primarily supplied by branches of the **Vagus nerve (CN X)**.

1.  **Above the level of the vocal cords:** Sensory supply is provided by the **Internal Laryngeal Nerve**, which is a branch of the **Superior Laryngeal Nerve (SLN)**. It pierces the thyrohyoid membrane to provide sensation to the laryngeal mucosa up to the level of the vocal folds.
2.  **Below the level of the vocal cords:** Sensory supply is provided by the **Recurrent Laryngeal Nerve (RLN)**, which covers the subglottic region down to the trachea.

**Analysis of Options:**
*   **A. Glossopharyngeal nerve (CN IX):** Provides sensory supply to the oropharynx, posterior 1/3rd of the tongue, and the vallecula, but not the larynx itself.
*   **C. Recurrent laryngeal nerve:** Provides sensory supply **below** the vocal cords and motor supply to all intrinsic muscles of the larynx except the cricothyroid.
*   **D. Pharyngeal branch of vagus nerve:** Primarily involved in the motor supply to the pharyngeal plexus (muscles of the pharynx and soft palate).

**High-Yield Clinical Pearls for NEET-PG:**
*   **Cricothyroid Muscle:** The only intrinsic laryngeal muscle supplied by the **External Laryngeal Nerve** (a branch of the SLN); all others are supplied by the RLN.
*   **Foreign Body Aspiration:** The "cough reflex" is triggered by the internal laryngeal nerve when a foreign body touches the supraglottic mucosa.
*   **Nerve Injury:** Injury to the SLN results in a loss of pitch (monotone voice) due to cricothyroid paralysis, whereas RLN injury typically causes hoarseness. [Practice more ENT questions on OnCourse]

ENT Questions

Topics

Otolaryngology Basics

Diseases of the Ear

Diseases of the Nose and Paranasal Sinuses

Diseases of the Oral Cavity and Salivary Glands

Diseases of the Pharynx

Diseases of the Larynx

Head and Neck Surgery

Facial Plastic and Reconstructive Surgery

Neurotology

Pediatric Otolaryngology

Audiology and Speech Disorders

Snoring and Sleep Apnea

Allergy and Immunotherapy

Otologic and Neurotologic Emergencies

ENT Oncology

Skull Base Surgery

Rhinology

Vestibular Disorders

Otology

Phoniatrics and Voice Disorders