Head — MCQs
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Which of the following foramen transmits maxillary nerve?
The image shows the parotid gland. Through which ganglion does the secretomotor supply to the parotid gland pass?
Identify the structure labeled as genioglossus in the given image showing a sagittal view of the oral cavity and pharynx.
The image shows the lateral pterygoid muscle. What is the primary action of this muscle on the mandible?
Which of the following is correct about the image shown below?
The highlighted part in the image is called
The secreto-motor fibers to the gland shown in the figure pass through?
All are true about the ganglion ' $X$ ' shown in the image except:
Safety muscle of the tongue is:
Identify the structure marked as $X$ below:
Head Indian Medical PG Practice Questions and MCQs
Question 1151: Which of the following foramen transmits maxillary nerve?
- A. Foramen ovale
- B. Foramen spinosum
- C. Foramen rotundum (Correct Answer)
- D. Foramen lacerum
Explanation: ***Foramen rotundum*** - The **maxillary nerve (V2)**, which is the second division of the trigeminal nerve, exits the middle cranial fossa through the foramen rotundum. - This foramen connects the middle cranial fossa to the **pterygopalatine fossa**. *Foramen ovale* - The foramen ovale transmits the **mandibular nerve (V3)**, which is the third division of the trigeminal nerve. - It also transmits the accessory meningeal artery and the lesser petrosal nerve. *Foramen spinosum* - The foramen spinosum transmits the **middle meningeal artery** and the meningeal branch of the mandibular nerve. - It is a small opening located posterolateral to the foramen ovale. *Foramen lacerum* - The foramen lacerum is a jagged opening filled with **fibrocartilage** in the living individual. - While some small vessels and nerves pass over it, no major cranial nerve passes *through* it in its entirety; the **internal carotid artery** passes over its superior aspect.
Question 1152: The image shows the parotid gland. Through which ganglion does the secretomotor supply to the parotid gland pass?
- A. Otic ganglion (Correct Answer)
- B. Ciliary ganglion
- C. Pterygopalatine ganglion
- D. Submandibular ganglion
Explanation: ***Otic ganglion*** - The **glossopharyngeal nerve (CN IX)** provides secretomotor innervation to the parotid gland. - The preganglionic parasympathetic fibers from CN IX travel via the **lesser petrosal nerve** and synapse in the **otic ganglion**. - Postganglionic fibers then travel with the **auriculotemporal nerve (branch of CN V3)** to innervate the parotid gland for salivary secretion. *Ciliary ganglion* - This is the parasympathetic ganglion associated with the **oculomotor nerve (CN III)**. - It provides postganglionic fibers for pupillary constriction and accommodation, not salivary secretion. *Pterygopalatine ganglion* - This is the parasympathetic ganglion associated with the **facial nerve (CN VII)** via the greater petrosal nerve. - It supplies the lacrimal gland and nasal/palatine glands, not the parotid gland. *Submandibular ganglion* - This is another parasympathetic ganglion associated with the **facial nerve (CN VII)** via the chorda tympani. - It supplies the submandibular and sublingual salivary glands, not the parotid gland.
Question 1153: Identify the structure labeled as genioglossus in the given image showing a sagittal view of the oral cavity and pharynx.
- A. Genioglossus (Correct Answer)
- B. Hyoglossus
- C. Palatoglossus
- D. Styloglossus
Explanation: The image displays a sagittal view of the oral cavity and pharynx, highlighting several muscles of the tongue and floor of the mouth. The question asks to identify the structure labeled as **genioglossus**. ***Genioglossus*** - The genioglossus muscle is the **largest and strongest extrinsic muscle** of the tongue. - It arises from the superior genial tubercle of the mandible and fans out posteriorly to insert into the dorsal surface of the tongue and the hyoid bone. Its actions include **protruding the tongue** (sticking it out), depressing the central part of the tongue, and acting as a safety muscle to prevent the tongue from falling backward and obstructing the airway. *Palatoglossus* - The palatoglossus muscle forms the **palatoglossal arch** and is located more superiorly and posteriorly, connecting the soft palate to the side of the tongue. - It functions to depress the soft palate and elevate the back of the tongue, thereby **narrowing the oropharyngeal isthmus**. *Styloglossus* - The styloglossus muscle originates from the **styloid process of the temporal bone** and inserts into the side and undersurface of the tongue. - Its primary actions are to **retract and elevate the tongue**, contributing to shaping the tongue for swallowing. *Hyoglossus* - The hyoglossus muscle arises from the **hyoid bone** and inserts into the side and inferior part of the tongue. - It primarily functions to **depress the tongue** and retract it. *Geniohyoid* - The geniohyoid muscle is a **suprahyoid muscle** located above the mylohyoid, originating from the inferior mental spine of the mandible and inserting into the body of the hyoid bone. - It functions to **elevate the hyoid bone** and pull it anteriorly, or to depress the mandible if the hyoid is fixed. *Mylohyoid muscle (out)* - The mylohyoid muscle forms the **floor of the mouth**, lying inferior to the genioglossus and geniohyoid. - It elevates the hyoid bone, elevates the floor of the mouth, and assists in **swallowing and speech**. The "(out)" likely signifies that the superficial portion of this muscle might have been partially removed or is shown extrinsically to other deeper muscles. *Hyoid bone* - The hyoid bone is a **U-shaped bone** located in the anterior neck between the mandible and the thyroid cartilage. - It serves as an **attachment point for muscles** of the tongue, floor of the mouth, pharynx, and larynx, and is unique in that it does not articulate directly with any other bone.
Question 1154: The image shows the lateral pterygoid muscle. What is the primary action of this muscle on the mandible?
- A. Depression (Correct Answer)
- B. Elevation
- C. Protrusion
- D. Mouth closure
Explanation: ***Depression*** - The **lateral pterygoid muscle** is the primary muscle responsible for **depression of the mandible** (opening the mouth). - It pulls the **mandibular condyle** and articular disc anteriorly and inferiorly out of the mandibular fossa. - This action initiates mouth opening by lowering the mandible. *Elevation* - **Elevation** of the mandible (closing the mouth) is performed by the **masseter**, **temporalis**, and **medial pterygoid muscles**. - The lateral pterygoid does not contribute to elevation; it opposes this action. *Protrusion* - While the lateral pterygoid does contribute to **protrusion** (forward movement of the mandible), this is a **secondary action**. - The **primary and most important function** is depression of the mandible for mouth opening. - Bilateral contraction causes protrusion, while unilateral contraction causes lateral deviation. *Mouth closure* - **Mouth closure** involves mandibular elevation and retrusion, achieved by the **masseter**, **temporalis**, and **medial pterygoid muscles**. - The lateral pterygoid opposes mouth closure by opening the mouth and moving the mandible forward.
Question 1155: Which of the following is correct about the image shown below?
- A. A = Cisterna magna, B= Posterior nasal aperture
- B. A = Ethmoidal sinus, B= Auditory tube opening
- C. A = Sphenoid sinus, B= Auditory tube opening (Correct Answer)
- D. A = Sella turcica, B= Posterior nasal aperture
Explanation: ***A = Sphenoid sinus, B= Auditory tube opening*** - Label **A** clearly points to the **sphenoid sinus**, an air-filled cavity within the sphenoid bone, located posterior to the nasal cavity and inferior to the sella turcica. - Label **B** indicates the opening of the **auditory (Eustachian) tube** in the lateral wall of the nasopharynx, connecting the nasopharynx to the middle ear. *A = Cisterna magna, B= Posterior nasal aperture* - **Cisterna magna** is a subarachnoid space located posterior to the cerebellum and medulla, not visible at this anterior anatomical location. - The **posterior nasal aperture (choana)** is the opening between the nasal cavity and the nasopharynx, which is located more anteriorly and inferiorly relative to point B. *A = Ethmoidal sinus, B= Auditory tube opening* - The **ethmoidal sinuses** are located anterior to the sphenoid sinus, within the ethmoid bone, and would appear more superior and anterior to where A is located. - While B is correctly identified as the auditory tube opening, A is misplaced for the ethmoidal sinus. *A = Sella turcica, B= Posterior nasal aperture* - The **sella turcica** is a saddle-shaped depression in the sphenoid bone, superior to the sphenoid sinus, which houses the pituitary gland. - The **posterior nasal aperture** is incorrect for B, as explained above.
Question 1156: The highlighted part in the image is called
- A. Pterion (Correct Answer)
- B. Bregma
- C. Asterion
- D. Lambda
Explanation: ***Pterion*** - The highlighted region indicates the **pterion**, a clinically significant area on the side of the skull where four skull bones (frontal, parietal, sphenoid, and temporal) meet. - It is a common site for trauma, as the middle meningeal artery lies deep to it, making it vulnerable to **epidural hematomas** if fractured.
Question 1157: The secreto-motor fibers to the gland shown in the figure pass through?
- A. Petrotympanic fissure (Correct Answer)
- B. Geniculate ganglion
- C. Infratemporal fossa
- D. Foramen spinosum
Explanation: ***Petrotympanic fissure*** - The image shows the **submandibular gland** and associated innervation. The secreto-motor fibers to this gland are postganglionic parasympathetic fibers originating from the **submandibular ganglion**. - These preganglionic parasympathetic fibers originate from the **facial nerve (CN VII)** as the chorda tympani, which passes through the **petrotympanic fissure** to join the lingual nerve before synapsing in the submandibular ganglion. *Geniculate ganglion* - The **geniculate ganglion** contains the sensory neuron cell bodies for taste from the anterior two-thirds of the tongue and preganglionic parasympathetic fibers that branch off to form the greater petrosal nerve. - While part of the facial nerve pathway, it does not directly transmit the secreto-motor fibers that supply the submandibular gland after they leave the facial nerve trunk. *Infratemporal fossa* - The **infratemporal fossa** is a region inferior to the temporal fossa, housing structures like the mandibular nerve, otic ganglion, and medial and lateral pterygoid muscles. - While the submandibular ganglion and parts of the nerve supply are in the vicinity, the specific anatomical passageway for the chorda tympani within the skull base is the petrotympanic fissure, not the infratemporal fossa as a whole. *Foramen spinosum* - The **foramen spinosum** transmits the middle meningeal artery and the meningeal branch of the mandibular nerve. - It is not involved in the passage of facial nerve branches or parasympathetic fibers related to salivary gland innervation.
Question 1158: All are true about the ganglion ' $X$ ' shown in the image except:
- A. Semilunar in shape
- B. Housed in Meckel's cave
- C. Corresponds to posterior root ganglion of spinal nerve
- D. Located at external genu near facial canal (Correct Answer)
Explanation: ***Located at external genu near facial canal*** - The ganglion labeled 'X' is the **trigeminal ganglion** (also known as the **Gasserian ganglion**). - The **geniculate ganglion** is located at the external genu of the facial nerve (cranial nerve VII) near the facial canal, not the trigeminal ganglion. - This statement is **incorrect** for the trigeminal ganglion, making it the correct answer to this EXCEPT question. *Semilunar in shape* - The **trigeminal ganglion** (ganglion 'X' in the image) is indeed flat and **semilunar or crescent-shaped**. - This characteristic shape allows it to conform to the contours of the temporal bone within the cranial cavity. *Housed in Meckel's cave* - The **trigeminal ganglion** is specifically located within a dura mater pouch known as **Meckel's cave** (also called the trigeminal cave or cavum trigeminale). - This cave is situated in the middle cranial fossa, near the apex of the petrous part of the temporal bone. *Corresponds to posterior root ganglion of spinal nerve* - The **trigeminal ganglion** is homologous to the **posterior root ganglia** (also known as dorsal root ganglia) of spinal nerves. - Both types of ganglia contain the cell bodies of **sensory neurons** (pseudounipolar neurons) that transmit sensory information to the central nervous system.
Question 1159: Safety muscle of the tongue is:
- A. A (Correct Answer)
- B. B
- C. C
- D. D
Explanation: ***A - Genioglossus muscle*** - The **genioglossus muscle** is the "safety muscle" of the tongue because it **prevents the tongue from falling backward and obstructing the airway**. - It originates from the **superior genial tubercle** of the mandible and fans out into the tongue, with its primary action being **tongue protrusion**. - **Clinical significance**: In unconscious patients, loss of genioglossus tone allows the tongue to fall back, causing airway obstruction. This is why the **jaw thrust maneuver** works—it pulls the mandible (and attached genioglossus) forward. *B - Mylohyoid muscle* - The mylohyoid forms the **floor of the mouth** (diaphragma oris). - Its primary function is **elevating the hyoid bone and floor of the mouth** during swallowing and speaking. - It does not directly prevent airway obstruction by the tongue. *C - Styloglossus muscle* - The styloglossus is an **extrinsic muscle** that retracts and elevates the tongue. - It acts as an **antagonist to the genioglossus**, pulling the tongue backward and upward. - It does not have a protective role in maintaining airway patency. *D - Palatoglossus muscle* - The palatoglossus elevates the **posterior part of the tongue** and depresses the soft palate. - It helps **seal off the oral cavity from the pharynx** during swallowing (forming the palatoglossal arch/anterior pillar of fauces). - It does not prevent tongue from falling back into the airway.
Question 1160: Identify the structure marked as $X$ below:
- A. Arytenoid cartilage (Correct Answer)
- B. Corniculate cartilage
- C. Cuneiform cartilage
- D. Thyroid cartilage
Explanation: ***Arytenoid cartilage*** - The image displays a superior view of the larynx, with **E** pointing to the **epiglottis**. The structures labeled **X** are located posterior and inferior to the epiglottis, consistent with the position of the **arytenoid cartilages**. - The arytenoid cartilages are paired, pyramidal-shaped cartilages that articulate with the **cricoid cartilage** and play a crucial role in vocal cord movement and phonation.
Practice by Chapter
Skull and Facial Bones
Practice Questions
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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