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A 22-year-old man is admitted to the emergency department after being beaten up in a street fight. Radiographic examination reveals that he has suffered a forehead fracture from a blow with a club, resulting in black and swollen eyes. Due to the patient's severe pain, an anesthetic solution is ordered to be injected into his orbit. Which nerve is most likely to be anesthetized?
Which of the following is not a paranasal sinus?
Which muscle is primarily responsible for the protrusion of the tongue?
Normal nasofrontal angle is:
Foramen spinosum transmits which of the following structures?
What is the anatomical relation between the upper lacrimal punctum and the lower punctum?
The perilymph, present in the scala vestibuli and scala tympani, drains into the cerebrospinal fluid through the
Which part of the external auditory canal is cartilaginous?
Following a knife injury to the face causing facial nerve damage, secretion from which of the following glands would be LEAST likely to be impaired?
During examination of the parotid gland, the parotid duct can be palpated at the following locations except:
Head Indian Medical PG Practice Questions and MCQs
Question 1331: A 22-year-old man is admitted to the emergency department after being beaten up in a street fight. Radiographic examination reveals that he has suffered a forehead fracture from a blow with a club, resulting in black and swollen eyes. Due to the patient's severe pain, an anesthetic solution is ordered to be injected into his orbit. Which nerve is most likely to be anesthetized?
- A. Infraorbital
- B. Anterior ethmoidal
- C. Ophthalmic
- D. Frontal (Correct Answer)
Explanation: The frontal nerve is a branch of the ophthalmic nerve (CN V1) and supplies sensation to the forehead, upper eyelid, and scalp, areas affected by swelling and pain due to the forehead fracture. Anesthetic injection into the orbit would target this nerve to alleviate pain in the supraorbital and supratrochlear regions. The face is commonly injured in the setting of blunt trauma, although these injuries are rarely life-threatening [1]. Facial injuries can result from direct impact during a blunt mechanism that results in the transmission of energy to the structures of the face; as a result, facial bone fractures and soft tissue injuries are commonly identified [1]. Directly anesthetizing the ophthalmic nerve would block sensation from the entire forehead, upper eyelid, and nasal dorsum, which might be overkill for a specific forehead injury.
Question 1332: Which of the following is not a paranasal sinus?
- A. Ethmoid sinus
- B. Pyriform sinus (Correct Answer)
- C. Maxillary sinus
- D. Frontal sinus
Explanation: ***Pyriform sinus*** - The **pyriform sinus** (or piriform fossa) is part of the **hypopharynx** and is not an air-filled cavity within the skull bones. - It serves as a channel for food and liquid to pass into the esophagus, located on either side of the laryngeal inlet. *Frontal sinus* - The **frontal sinuses** are paired air-filled cavities located within the **frontal bone**, superior to the orbits. - They are one of the four main groups of paranasal sinuses. *Ethmoid sinus* - The **ethmoid sinuses** are a collection of small air cells located within the **ethmoid bone** between the eyes. - They are typically divided into anterior, middle, and posterior groups. *Maxillary sinus* - The **maxillary sinuses** are the largest of the paranasal sinuses, located within the **maxillary bone** (cheekbones). - They are paired and pyramidal-shaped, draining into the middle meatus of the nasal cavity.
Question 1333: Which muscle is primarily responsible for the protrusion of the tongue?
- A. Palatoglossus
- B. Genioglossus (Correct Answer)
- C. Styloglossus
- D. Hyoglossus
Explanation: ***Genioglossus*** - The **genioglossus muscle** is the largest and strongest extrinsic tongue muscle, primarily responsible for **protruding the tongue** and depressing its central part. - Its contraction pulls the tongue forward and downward, allowing it to extend out of the mouth. *Styloglossus* - The **styloglossus muscle** retracts the tongue and draws it upward, assisting in swallowing. - It is involved in movements that pull the tongue back into the oral cavity, rather than pushing it out. *Hyoglossus* - The **hyoglossus muscle** depresses the tongue and pulls its sides downward, facilitating tongue shaping during speech and swallowing. - It primarily aids in flattening and lowering the tongue, not in protrusion. *Palatoglossus* - The **palatoglossus muscle** elevates the posterior part of the tongue and depresses the soft palate, helping to initiate swallowing and narrow the fauces. - It is involved in movements that position the tongue for swallowing, not in tongue protrusion.
Question 1334: Normal nasofrontal angle is:
- A. 105
- B. 125 (Correct Answer)
- C. 134
- D. 190
Explanation: Normal nasofrontal angle is: ***125*** - The **nasofrontal angle** is a key anthropometric measurement in facial aesthetics, particularly important in **rhinoplasty** and craniofacial analysis. - The normal nasofrontal angle ranges from **115-130 degrees**, with **120-125 degrees** considered the average ideal. - An angle of **125 degrees** falls well within this normal range and represents a **harmonious transition** from the forehead to the nasal bridge. - This angle provides a natural-appearing nasofrontal depression (sellion) and is aesthetically balanced for most facial profiles. *105* - An angle of **105 degrees** is significantly **below the normal range** (115-130°) and would be considered acute. - This could indicate a **deep sellion** or overly projected brow, potentially creating a "ski-slope" appearance or **concave nasal profile**. - Such an acute angle may result in an aesthetically less favorable appearance with excessive nasofrontal depression. *134* - An angle of **134 degrees** is **above the normal range** and would be considered obtuse. - This would create a **flatter transition** from forehead to nose with minimal nasofrontal depression. - While not as extreme as 190°, this angle exceeds the typical ideal range and may appear as an overly straight or convex profile. *190* - An angle of **190 degrees** is anatomically extreme and represents a nearly **flat or obtuse transition** from forehead to nose. - This would indicate virtually **no nasofrontal depression**, which is aesthetically undesirable and not within normal anatomical variations. - Such an extreme angle is rarely seen and would represent significant deviation from normal facial proportions.
Question 1335: Foramen spinosum transmits which of the following structures?
- A. Lesser petrosal nerve
- B. Middle meningeal artery (Correct Answer)
- C. Mandibular nerve
- D. Maxillary nerve
Explanation: ***Middle meningeal artery*** - The **foramen spinosum**, a small opening in the greater wing of the sphenoid bone, is primarily known for transmitting the **middle meningeal artery**. - This artery supplies blood to the **dura mater** and calvaria, making its passage through the foramen spinosum crucial for intracranial arterial supply. *Lateral petrosal nerve* - The **lesser petrosal nerve**, not the lateral petrosal nerve, passes through the **foramen ovale** or occasionally a small fissure near it, not the foramen spinosum. - The lesser petrosal nerve is involved in **parasympathetic innervation** to the parotid gland. *Mandibular nerve* - The **mandibular nerve** (V3), a branch of the trigeminal nerve, exits the skull through the **foramen ovale**, located anterior and lateral to the foramen spinosum. - It provides both **sensory and motor innervation** to structures in the head and neck. *Maxillary nerve* - The **maxillary nerve** (V2), another branch of the trigeminal nerve, exits the skull through the **foramen rotundum**, which is anterior to the foramen ovale. - It is primarily responsible for **sensory innervation** to the midface region.
Question 1336: What is the anatomical relation between the upper lacrimal punctum and the lower punctum?
- A. Medial position (Correct Answer)
- B. Touching each other
- C. No anatomical relation
- D. Farther from midline
Explanation: ***Medial position*** - The **upper lacrimal punctum** is positioned slightly more **medially** than the lower punctum on the upper eyelid. - This anatomical arrangement contributes to the efficient drainage of tears into the **lacrimal drainage system**. *Touching each other* - The upper and lower puncta are **distinct orifices** on their respective eyelids and do not physically touch each other. - They are separated by the interpalpebral fissure and the eyelid margins. *No anatomical relation* - This statement is incorrect as there is a clear and functional **anatomical relationship** between the upper and lower puncta. - They both serve as entrances to the **lacrimal canaliculi** and are crucial for tear drainage. *Farther from midline* - The upper punctum is not farther from the midline; rather, it is positioned slightly **more medially** than the lower punctum. - Both puncta are located towards the **medial canthus** of the eye to facilitate tear collection.
Question 1337: The perilymph, present in the scala vestibuli and scala tympani, drains into the cerebrospinal fluid through the
- A. Aqueduct of cochlea (Correct Answer)
- B. Aqueduct of vestibule
- C. Cochlear duct
- D. Ductus reuniens
Explanation: ***Aqueduct of cochlea*** - The **aqueduct of cochlea (perilymphatic duct)** is a small canal that connects the **subarachnoid space**, which contains cerebrospinal fluid, with the **perilymphatic space** of the inner ear (scala tympani). [1] - This connection allows for the drainage of perilymph and helps in the regulation of perilymphatic pressure and composition. *Aqueduct of vestibule* - The **aqueduct of vestibule** houses the **endolymphatic duct and sac**, which are involved in the reabsorption and regulation of **endolymph**, not perilymph. - It drains **endolymph** into the dural venous sinuses, not perilymph into the cerebrospinal fluid. *Ductus reuniens* - The **ductus reuniens** is a small tube that connects the **saccule** (part of the vestibular system) to the **cochlear duct**. - It facilitates the flow and communication of **endolymph** between these two structures, and is not involved in perilymph drainage into CSF. *Cochlear duct* - The **cochlear duct (scala media)** is filled with **endolymph** and is the site of the organ of Corti, essential for hearing. - It is distinct from the perilymph-filled scala vestibuli and scala tympani and does not drain into the cerebrospinal fluid.
Question 1338: Which part of the external auditory canal is cartilaginous?
- A. Lateral 2/3 (Cartilaginous)
- B. Medial 2/3 (Osseous)
- C. Medial 1/3 (Osseous)
- D. Lateral 1/3 (Cartilaginous) (Correct Answer)
Explanation: ***Lateral 1/3 (Cartilaginous)*** - The **external auditory canal** is composed of a **lateral cartilaginous portion** and a **medial osseous (bony) portion**. - The cartilaginous part forms approximately the **outer one-third (lateral 1/3)** of the canal and is continuous with the cartilage of the auricle. - This is the **correct answer** to the question. *Lateral 2/3 (Cartilaginous)* - This incorrectly states that **two-thirds** of the canal is cartilaginous. - In reality, only the **lateral 1/3** is cartilaginous, while the **medial 2/3** is osseous (bony). *Medial 2/3 (Osseous)* - This statement is **anatomically correct** - the medial 2/3 of the external auditory canal is indeed osseous. - However, the question asks for the **cartilaginous part**, not the osseous part. *Medial 1/3 (Osseous)* - This is **anatomically incorrect** as it suggests only **1/3** of the canal is osseous. - The **osseous (bony) part** actually constitutes the **medial 2/3** of the external auditory canal, not 1/3.
Question 1339: Following a knife injury to the face causing facial nerve damage, secretion from which of the following glands would be LEAST likely to be impaired?
- A. Parotid gland (Correct Answer)
- B. Sublingual gland
- C. Lacrimal gland
- D. Submandibular gland
Explanation: ***Parotid gland*** - The **parotid gland** receives parasympathetic innervation for secretion via the **glossopharyngeal nerve (CN IX)**, specifically through the **lesser petrosal nerve** → **otic ganglion** → **auriculotemporal nerve**. - The **facial nerve (CN VII)** passes through the parotid gland but does not provide secretomotor innervation, so facial nerve damage would **not impair parotid secretion**. *Sublingual gland* - The **sublingual gland** receives parasympathetic innervation from the **facial nerve (CN VII)** via the **chorda tympani** → **submandibular ganglion**. - Damage to the facial nerve would impair secretion from the sublingual gland. *Lacrimal gland* - The **lacrimal gland** receives parasympathetic innervation from the **facial nerve (CN VII)** via the **greater petrosal nerve** → **pterygopalatine ganglion**. - Damage to the facial nerve would impair tear production from the lacrimal gland, leading to **dry eye** (keratoconjunctivitis sicca). *Submandibular gland* - The **submandibular gland** receives parasympathetic innervation from the **facial nerve (CN VII)** via the **chorda tympani** → **submandibular ganglion**. - Damage to the facial nerve would impair secretion from the submandibular gland.
Question 1340: During examination of the parotid gland, the parotid duct can be palpated at the following locations except:
- A. At the anterior border of parotid gland
- B. Where it pierces the buccinator
- C. Anterior border of masseter
- D. At the opening just opposite to upper second molar (Correct Answer)
Explanation: ***At the opening just opposite to upper second molar*** - This location refers to the **intraoral opening** of the parotid duct (Stensen's duct), where it opens into the oral vestibule. - This opening is **mucosal and internal**, and cannot be palpated from the exterior during clinical examination. - Palpation of the parotid duct refers to external bimanual palpation through the cheek. *Anterior border of masseter* - The parotid duct crosses the **anterior border of the masseter muscle** superficially before turning medially. - This is the **most common location** for external palpation of the duct - it can be felt by pressing the cheek against the masseter. *Where it pierces the buccinator* - While the duct does pierce the buccinator muscle, at this point it becomes **deep and intramucosal**. - External palpation becomes difficult once the duct enters the buccinator, though the duct may still be felt along its course just before piercing. *At the anterior border of parotid gland* - The parotid duct emerges from the **anterior border of the parotid gland** and runs anteriorly across the masseter. - This is the **initial segment** of the duct's superficial course and can be palpated externally.
Practice by Chapter
Skull and Facial Bones
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Scalp and Facial Muscles
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Dural Venous Sinuses
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Cranial Cavity
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Orbit and Contents
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Temporal and Infratemporal Regions
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Pterygopalatine Fossa
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Oral Cavity
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Paranasal Sinuses
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Applied Anatomy and Clinical Correlations
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