Physiology of Speech and Swallowing Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Physiology of Speech and Swallowing. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Physiology of Speech and Swallowing Indian Medical PG Question 1: Which of the following changes in voice is not produced as a result of external laryngeal nerve injury post thyroidectomy?
- A. Inability to sing at higher ranges
- B. Poor volume and projection
- C. Hoarseness (Correct Answer)
- D. Voice fatigue
Physiology of Speech and Swallowing Explanation: ***Hoarseness***
- **Hoarseness** is primarily caused by injury to the **recurrent laryngeal nerve (RLN)**, which innervates most intrinsic laryngeal muscles responsible for vocal cord adduction and abduction.
- An external laryngeal nerve (ELN) injury affects the **cricothyroid muscle**, leading to less tension on the vocal cords, but typically not frank hoarseness.
*Voice fatigue*
- Injury to the external laryngeal nerve (ELN) weakens the **cricothyroid muscle**, which is responsible for tensing and elongating the vocal cords.
- This weakness leads to greater effort required to maintain vocal quality, resulting in **voice fatigue**.
*Inability to sing at higher ranges*
- The **cricothyroid muscle**, innervated by the ELN, is crucial for increasing vocal cord tension.
- Increased tension is necessary for adjusting vocal pitch and reaching **higher frequencies** or notes.
*Poor volume and projection*
- The cricothyroid muscle's role in vocal cord tension contributes to the efficiency of vocal fold vibration.
- Reduced tension due to ELN injury can lead to decreased **vocal power and projection**.
Physiology of Speech and Swallowing Indian Medical PG Question 2: A woman must vomit whenever she eats spicy food. Arrange the sequence of events during vomiting.
1. LES is open and UES is closed
2. Strong contractions in the stomach
3. Inspiration against a closed glottis
4. Relaxation of the pyloric sphincter
5. LES opens and UES opens
6. Reverse peristalsis in the small intestine
LES: Lower esophageal sphincter
UES: Upper esophageal sphincter
- A. 4,6,2,1,3,5
- B. 4,6,2,5,3,1
- C. 6,4,2,5,1,3
- D. 6,4,2,3,1,5 (Correct Answer)
Physiology of Speech and Swallowing Explanation: ***6,4,2,3,1,5***
- The correct sequence of vomiting begins with **reverse peristalsis in the small intestine (6)**, which propels intestinal contents retrograde toward the stomach.
- The **pyloric sphincter then relaxes (4)**, allowing duodenal contents to enter the stomach and mix with gastric contents.
- **Strong stomach contractions (2)** follow, building initial pressure within the gastric lumen.
- **Deep inspiration against a closed glottis (3)** is critical—this generates high intra-abdominal and intrathoracic pressure (the essential expulsive force).
- The **LES opens while UES remains closed (1)**, allowing gastric contents to move into the esophagus.
- Finally, the **UES opens (5)**, permitting expulsion of contents through the mouth.
*4,6,2,1,3,5*
- Incorrect because **pyloric sphincter relaxation precedes reverse peristalsis**, which is physiologically backwards—intestinal contents must first move toward the stomach before the pylorus can allow them entry.
- The positioning of glottis closure late in the sequence misrepresents when intra-abdominal pressure is generated.
*4,6,2,5,3,1*
- This sequence incorrectly places **both sphincters opening (5) before the critical pressure-generating step (3)**, which would result in premature expulsion without adequate force.
- The inspiration against closed glottis must occur before final sphincter opening to create the necessary expulsive pressure.
*6,4,2,5,1,3*
- This option misorders the final events by having **both sphincters open (5) before adequate pressure generation (3)** and before the sequential LES opening (1).
- The glottis closure step is positioned too late—it must precede sphincter opening to generate the high intra-abdominal pressure required for forceful expulsion.
Physiology of Speech and Swallowing Indian Medical PG Question 3: A patient was admitted with skull base trauma. The doctor was testing the marked structure in the pharyngeal region. Which of the following nerves was being tested?
- A. Trigeminal nerve
- B. Facial nerve
- C. Glossopharyngeal nerve (Correct Answer)
- D. Vagus
- E. Hypoglossal nerve
Physiology of Speech and Swallowing Explanation: ***Glossopharyngeal nerve***
- The image shows a probe stimulating the posterior part of the **pharynx**, which elicits the **gag reflex**.
- The afferent limb of the **gag reflex** is mediated primarily by the **glossopharyngeal nerve (CN IX)**, which detects sensation from the posterior tongue and pharynx.
*Trigeminal nerve*
- The **trigeminal nerve (CN V)** primarily mediates sensation from the face, teeth, and anterior two-thirds of the tongue, and motor control of the **muscles of mastication**.
- It does not have a primary role in the sensation or reflex of the posterior pharyngeal wall.
*Facial nerve*
- The **facial nerve (CN VII)** is responsible for the **muscles of facial expression**, taste from the anterior two-thirds of the tongue, and parasympathetic innervation to several glands.
- While it contributes to some aspects of swallowing, it is not the main sensory nerve for the gag reflex from the posterior pharynx.
*Vagus*
- The **vagus nerve (CN X)** provides the efferent limb of the gag reflex, causing pharyngeal muscle contraction.
- However, the sensory input from the posterior pharynx (the afferent limb being tested by the probe) is primarily carried by the **glossopharyngeal nerve**.
*Hypoglossal nerve*
- The **hypoglossal nerve (CN XII)** provides motor innervation to the intrinsic and extrinsic muscles of the tongue.
- While it is relevant in skull base trauma, it does not mediate sensation from the pharynx or the gag reflex being tested in the image.
Physiology of Speech and Swallowing Indian Medical PG Question 4: Match the following:
A) Glossopharyngeal nerve
B) Spinal accessory nerve
C) Facial nerve
D) Mandibular nerve
1) Shrugging of shoulder
2) Touch sensation from the posterior one-third of the tongue
3) Chewing
4) Taste from the anterior two-thirds of the tongue
- A. A-3 , B-1 , C-4 , D-2
- B. A-2 , B-3 , C-4 , D-1
- C. A-4 , B-1 , C-2 , D-3
- D. A-2 , B-1 , C-4 , D-3 (Correct Answer)
Physiology of Speech and Swallowing Explanation: ***A-2 , B-1 , C-4 , D-3***
- **A) Glossopharyngeal nerve (CN IX)** is responsible for **general sensation and taste from the posterior one-third of the tongue** [1]. (2).
- **B) Spinal Accessory nerve (CN XI)** innervates the **sternocleidomastoid** and **trapezius muscles**, which are involved in shrugging the shoulders (1).
- **C) Facial nerve (CN VII)** carries **taste sensation from the anterior two-thirds of the tongue** [1] (4) via the chorda tympani.
- **D) Mandibular nerve (V3)**, a branch of the trigeminal nerve, innervates the muscles of mastication, enabling **chewing** (3).
*A-3 , B-1 , C-4 , D-2*
- This option incorrectly associates the **glossopharyngeal nerve** with chewing, which is a function of the mandibular nerve (V3).
- It also incorrectly associates the **mandibular nerve** with touch sensation from the posterior one-third of the tongue, which is a function of the glossopharyngeal nerve [1].
*A-2 , B-3 , C-4 , D-1*
- This option incorrectly links the **spinal accessory nerve** with chewing; this nerve primarily controls shoulder and neck movements.
- It also incorrectly assigns shrugging of the shoulder to the **mandibular nerve** instead of the spinal accessory nerve.
*A-4 , B-1 , C-2 , D-3*
- This choice incorrectly attributes **taste from the anterior two-thirds of the tongue** to the glossopharyngeal nerve, which supplies the posterior one-third [1].
- It also incorrectly links **touch sensation from the posterior one-third of the tongue** to the facial nerve, which is involved in taste from the anterior two-thirds [1].
Physiology of Speech and Swallowing Indian Medical PG Question 5: Wernicke's encephalopathy involves which part of the CNS?
- A. Thalamus and Frontal lobe
- B. Mammillary body and Thalamus (Correct Answer)
- C. Mammillary body only
- D. Mammillary body and Frontal lobe
Physiology of Speech and Swallowing Explanation: ***Correct: Mammillary body and Thalamus***
- **Wernicke's encephalopathy** is characterized by damage to specific brain regions due to **thiamine (vitamin B1) deficiency**, most notably the **mammillary bodies** and **dorsomedial thalamus**.
- These areas are crucial for memory formation and processing, explaining the classic triad of symptoms: **ataxia**, **ophthalmoplegia**, and **confusion/altered mental status**.
- Other affected regions include the **periaqueductal gray matter**, **tectal plate**, and **floor of the fourth ventricle**.
*Incorrect: Thalamus and Frontal lobe*
- While the **thalamus** is indeed involved (specifically the dorsomedial nuclei), the **frontal lobe** is not a primary site of acute damage in Wernicke's encephalopathy.
- Frontal lobe dysfunction may occur secondarily in chronic cases or in Korsakoff syndrome, but it is not part of the characteristic pathological findings.
*Incorrect: Mammillary body only*
- Although the **mammillary bodies** are the most consistently and severely affected structures, damage is **not confined to them alone**.
- The **thalamus** (particularly dorsomedial nuclei) and other **periventricular structures** are also characteristically involved in the pathology.
*Incorrect: Mammillary body and Frontal lobe*
- The **frontal lobe** is not a characteristic region of acute damage in Wernicke's encephalopathy.
- This option incorrectly substitutes the **thalamus** (which is actually affected) with the frontal lobe, providing an inaccurate picture of the pathological distribution.
Physiology of Speech and Swallowing Indian Medical PG Question 6: Which muscle is derived from the third pharyngeal arch?
- A. Tensor tympani
- B. Stylopharyngeus (Correct Answer)
- C. Cricothyroid
- D. Stapedius
Physiology of Speech and Swallowing Explanation: ***Stylopharyngeus***
- The **stylopharyngeus muscle** is uniquely derived from the **third pharyngeal arch**.
- It is innervated by the **glossopharyngeal nerve (CN IX)** and plays a role in elevating the pharynx and larynx during swallowing.
- This is the **only muscle** derived from the third pharyngeal arch, making it a key anatomical landmark.
*Tensor tympani*
- The **tensor tympani muscle** is derived from the **first pharyngeal arch**.
- It is innervated by the **mandibular nerve (V3)** and dampens sound by tensing the tympanic membrane.
*Cricothyroid*
- The **cricothyroid muscle** is derived from the **fourth and sixth pharyngeal arches**.
- It is innervated by the **external branch of the superior laryngeal nerve (CN X)** and tenses the vocal cords.
*Stapedius*
- The **stapedius muscle** is derived from the **second pharyngeal arch**.
- It is innervated by the **facial nerve (CN VII)** and dampens sound by stabilizing the stapes bone.
Physiology of Speech and Swallowing Indian Medical PG Question 7: A singer presents with difficulty singing at a high pitch. On examination, bowing of the vocal cord is observed on the right side. Which of the following muscles has likely been compromised?
- A. Posterior cricoarytenoid
- B. Lateral cricoarytenoid
- C. Cricothyroid (Correct Answer)
- D. Thyroarytenoid
Physiology of Speech and Swallowing Explanation: ***Cricothyroid***
- The **cricothyroid muscle** is primarily responsible for **tensioning and elongating the vocal cords**, which is crucial for increasing vocal pitch.
- Damage to this muscle or its innervation (superior laryngeal nerve) results in an inability to reach higher pitches and can cause **vocal cord bowing** due to reduced tension.
*Posterior cricoarytenoid*
- This muscle is the **primary abductor** of the vocal cords, meaning it opens the vocal cords for breathing.
- Compromise would lead to difficulty breathing or a paralyzed vocal cord in the adducted position, not bowing with difficulty singing high notes.
*Lateral cricoarytenoid*
- The **lateral cricoarytenoid muscle** is a **vocal cord adductor** and rotator, bringing the vocal cords together to regulate voice intensity.
- Dysfunction typically results in a weak and breathy voice, or difficulty bringing the cords together, not specifically difficulty with high pitch.
*Thyroarytenoid*
- The **thyroarytenoid muscle** (which includes the vocalis muscle) acts to **relax and shorten the vocal cords**, lowering pitch and modulating vocal cord tension.
- Dysfunction would primarily lead to difficulty with lower pitches or a hoarse voice, as it prevents proper relaxation of the vocal cords.
Physiology of Speech and Swallowing Indian Medical PG Question 8: Steps of intubation - arrange in sequence:- a. Head extension and flexion of neck b. Introduction of laryngoscope c. Inflation of cuff d. Check breath sounds with stethoscope e. fixation of the tube to prevent dislodgement
- A. CBAED
- B. ACBED
- C. DBCEA
- D. ABCDE (Correct Answer)
Physiology of Speech and Swallowing Explanation: **ABCDE**
- The correct sequence for intubation starts with proper patient positioning (**A. Head extension and flexion of neck**) followed by insertion of the laryngoscope (**B. Introduction of laryngoscope**).
- After visualizing the glottis and inserting the endotracheal tube, the cuff is inflated (**C. Inflation of cuff**), tube placement is confirmed by checking breath sounds (**D. Check breath sounds with stethoscope**), and finally, the tube is secured (**E. Fixation of the tube to prevent dislodgement**).
*CBAED*
- This sequence is incorrect because inflating the cuff (C) and introducing the laryngoscope (B) occur before head positioning (A), and checking breath sounds (E) and fixation (D) are not in the correct order after intubation.
- Proper patient positioning is the critical first step to align the oral, pharyngeal, and laryngeal axes for optimal visualization.
*ACBED*
- This sequence incorrectly places the inflation of the cuff (C) before the introduction of the laryngoscope (B) and confirmation steps (E and D).
- The cuff is inflated only after the tube is properly placed in the trachea, and confirmation of placement always precedes fixation.
*DBCEA*
- This sequence is incorrect as it begins with checking breath sounds (D), which is a step for confirming tube placement, not initiating the intubation process.
- Head positioning (A) is also placed last, which is contrary to the vital initial steps of airway management for intubation.
Physiology of Speech and Swallowing Indian Medical PG Question 9: Which cranial nerve is not associated with the nucleus ambiguus?
- A. Cranial Nerve X (Vagus)
- B. Cranial Nerve XI (Accessory)
- C. Cranial Nerve IX (Glossopharyngeal)
- D. Cranial Nerve XII (Hypoglossal) (Correct Answer)
Physiology of Speech and Swallowing Explanation: ***Cranial Nerve XII (Hypoglossal)***
- The **hypoglossal nucleus** in the medulla is the origin for CN XII, which primarily controls **tongue movements** [1].
- It does not receive motor fibers from the nucleus ambiguus, as its function is unrelated to the pharyngeal or laryngeal musculature.
*Cranial Nerve X (Vagus)*
- Motor fibers for the muscles of the **pharynx** and **larynx** from the nucleus ambiguus contribute to the vagus nerve.
- The vagus nerve also provides parasympathetic innervation to the **thoracic and abdominal viscera**.
*Cranial Nerve XI (Accessory)*
- Cranial root contributions from the nucleus ambiguus exit with the vagus nerve to innervate the **laryngeal muscles**.
- The **spinal root** of the accessory nerve, originating from the cervical spinal cord, innervates the **sternocleidomastoid** and **trapezius muscles**.
*Cranial Nerve IX (Glossopharyngeal)*
- The nucleus ambiguus provides motor innervation for the **stylopharyngeus muscle** via the glossopharyngeal nerve.
- This muscle plays a role in **swallowing** and elevates the pharynx.
Physiology of Speech and Swallowing Indian Medical PG Question 10: End tracheostomy is performed in patients undergoing surgery for which of the following conditions?
- A. Laryngectomy (Correct Answer)
- B. Laryngofissure surgery
- C. Oropharyngeal growth
- D. Obstructive sleep apnea with stridor
Physiology of Speech and Swallowing Explanation: **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.
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