Head — MCQs
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All are structures lying deep to the hyoglossus muscle except:
Elevation of the eyebrows and production of transverse wrinkles of the face is characteristic of which muscle contraction?
A 27-year-old woman is admitted to the emergency department after being thrown from a motor scooter. Radiographic evaluation reveals a type I Lefort fracture and comminuted fractures of the mandible and temporomandibular joint. Despite reconstructive surgery, the patient develops hyperacusis due to facial nerve paralysis. Which muscle is most likely paralyzed?
All of the following are structures associated with the pterygopalatine fossa, except:
Which of the following arteries is a branch of the facial artery?
Which of the following is the LARGEST paranasal sinus that drains directly into the middle meatus?
Which of the following structures is not found in the parotid gland?
Which structure contributes to the formation of the arcuate eminence of the petrous temporal bone?
Ascending pharyngeal artery is a branch of which?
Which of the following is not a part of the ethmoidal bone?
Head Indian Medical PG Practice Questions and MCQs
Question 1351: All are structures lying deep to the hyoglossus muscle except:
- A. Hypoglossal nerve
- B. Lingual artery
- C. Stylohyoid muscle (Correct Answer)
- D. Geniohyoid muscle
Explanation: ***Stylohyoid muscle*** - The **stylohyoid muscle** is a suprahyoid muscle that runs superficially in the neck. - It lies **superficial to the hyoglossus muscle**, not deep to it. - It originates from the styloid process and splits around the intermediate tendon of digastric before inserting on the hyoid bone. - This is the correct answer as it does NOT lie deep to hyoglossus. *Lingual artery* - The **lingual artery** passes deep to the hyoglossus muscle in its course. - While its third part emerges at the anterior border of hyoglossus, the middle portion runs deep to this muscle. - It is one of the classic structures deep to hyoglossus. *Hypoglossal nerve* - The **hypoglossal nerve (CN XII)** passes deep to the hyoglossus muscle. - It runs along with the lingual vein in the deep plane. - It provides motor innervation to intrinsic and most extrinsic tongue muscles (except palatoglossus). *Geniohyoid muscle* - The **geniohyoid muscle** lies deep to both mylohyoid and hyoglossus muscles. - It extends from the inferior genial tubercle of the mandible to the body of the hyoid bone. - It acts to elevate and protract the hyoid bone during swallowing.
Question 1352: Elevation of the eyebrows and production of transverse wrinkles of the face is characteristic of which muscle contraction?
- A. Only the frontal belly of occipitofrontalis contracts (Correct Answer)
- B. Only the occipital belly of occipitofrontalis contracts
- C. Both bellies of occipitofrontalis contract one after the other
- D. Both bellies of occipitofrontalis contract simultaneously
Explanation: **Only the frontal belly of occipitofrontalis contracts** - The **frontal belly of the occipitofrontalis** muscle is responsible for elevating the eyebrows and producing **transverse (horizontal) wrinkles on the forehead** [1]. - It is innervated by the **temporal branches of the facial nerve (CN VII)** and its actions are crucial for expressing emotions like surprise or curiosity. - This is the primary muscle action for the described movements. *Only the occipital belly of occipitofrontalis contracts* - The **occipital belly of the occipitofrontalis** muscle pulls the scalp posteriorly. - It does not directly affect eyebrow movement or forehead wrinkling. - Its main function is to retract the scalp backward. *Both bellies of occipitofrontalis contract one after the other* - While both bellies can act, their primary functions are distinct and do not typically involve sequential contraction for eyebrow elevation. - The **frontal belly alone** is responsible for the specific action of eyebrow elevation and forehead wrinkling. *Both bellies of occipitofrontalis contract simultaneously* - Simultaneous contraction would primarily tighten the **epicranial aponeurosis** (galea aponeurotica) and stabilize the scalp. - However, the **frontal belly acting alone** is singularly responsible for the specific action of eyebrow elevation and creating transverse forehead wrinkles [1]. - This combined action does not produce the characteristic eyebrow elevation described in the question.
Question 1353: A 27-year-old woman is admitted to the emergency department after being thrown from a motor scooter. Radiographic evaluation reveals a type I Lefort fracture and comminuted fractures of the mandible and temporomandibular joint. Despite reconstructive surgery, the patient develops hyperacusis due to facial nerve paralysis. Which muscle is most likely paralyzed?
- A. Stapedius (Correct Answer)
- B. Stylohyoid
- C. Posterior belly of digastric
- D. Tensor tympani
Explanation: Stapedius - The **stapedius muscle** is innervated by the **facial nerve (CN VII)** and its paralysis leads to **hyperacusis** because it cannot dampen excessive sound vibrations in the middle ear. - The damage to the facial nerve in this trauma, particularly affecting the branch to the stapedius in the middle ear, is consistent with this outcome. [1] *Posterior belly of digastric* - The **posterior belly of the digastric muscle** is also innervated by the **facial nerve**, but its paralysis primarily affects **swallowing** and **mandibular depression**, not hyperacusis. - While facial nerve injury would affect this muscle, its dysfunction does not directly cause hyperacusis. *Stylohyoid* - The **stylohyoid muscle** is innervated by the **facial nerve** and assists in elevating the **hyoid bone** and retracting the **tongue**. - Paralysis of this muscle would cause difficulties with **swallowing** and **speech**, not hyperacusis. *Tensor tympani* - The **tensor tympani muscle** is innervated by the **trigeminal nerve (CN V)**, not the facial nerve. - While it also helps to dampen sounds, its paralysis would not be a direct consequence of facial nerve paralysis.
Question 1354: All of the following are structures associated with the pterygopalatine fossa, except:
- A. Pterygopalatine ganglion
- B. Maxillary nerve
- C. Greater petrosal nerve
- D. Mid third of maxillary artery (Correct Answer)
Explanation: ***Mid third of maxillary artery*** - The pterygopalatine fossa primarily contains the **third part (pterygopalatine part)** of the maxillary artery, which gives off numerous branches within this space. - The **mid third** (second part/pterygoid part) of the maxillary artery is located in the **infratemporal fossa**, not the pterygopalatine fossa. *Pterygopalatine ganglion* - The **pterygopalatine ganglion** is a parasympathetic ganglion located within the pterygopalatine fossa, suspended from the maxillary nerve. - It receives preganglionic parasympathetic fibers via the **nerve of the pterygoid canal (vidian nerve)** and distributes postganglionic fibers to lacrimal, nasal, and palatine glands. *Maxillary nerve* - The **maxillary nerve (CN V2)** passes through the pterygopalatine fossa after emerging from the foramen rotundum. - It gives off several branches within the fossa, including the **zygomatic nerve**, **posterior superior alveolar nerves**, and **ganglionic branches** to the pterygopalatine ganglion. *Greater petrosal nerve* - The **greater petrosal nerve** (a branch of the facial nerve, CN VII) carries preganglionic parasympathetic fibers that join the deep petrosal nerve to form the **nerve of the pterygoid canal (vidian nerve)**. - The vidian nerve traverses the **pterygoid (vidian) canal** to reach the pterygopalatine ganglion within the pterygopalatine fossa. - While the greater petrosal nerve itself does not directly enter the fossa, it is functionally associated through the vidian nerve pathway.
Question 1355: Which of the following arteries is a branch of the facial artery?
- A. Infraorbital, dorsal nasal, deep facial, mental
- B. Ascending palatine, superficial temporal, submental, inferior labial
- C. Superior thyroid, lingual, facial, maxillary
- D. Inferior labial, superior labial, lateral nasal, angular (Correct Answer)
Explanation: ***Inferior labial, superior labial, lateral nasal, angular*** - The **facial artery** is a major branch of the **external carotid artery** that supplies the face. - Its key branches include the **inferior labial**, **superior labial**, **lateral nasal**, and **angular arteries**, which contribute to the blood supply of the lips, nose, and medial canthus of the eye. *Ascending palatine, superficial temporal, submental, inferior labial* - The **superficial temporal artery** is a terminal branch of the **external carotid artery**, not the facial artery. - While the **ascending palatine** and **submental arteries** are branches of the facial artery, including the superficial temporal artery makes this option incorrect. *Infraorbital, dorsal nasal, deep facial, mental* - The **infraorbital artery** and **mental artery** are branches of the **maxillary artery**, which is another branch of the external carotid artery, not the facial artery. - The **dorsal nasal artery** is typically a terminal branch of the **ophthalmic artery**, which arises from the internal carotid artery. *Superior thyroid, lingual, facial, maxillary* - These are all **major branches of the external carotid artery** itself, not branches of the facial artery. - The question specifically asks for branches *of* the facial artery.
Question 1356: Which of the following is the LARGEST paranasal sinus that drains directly into the middle meatus?
- A. Frontal sinus
- B. Posterior ethmoid sinus
- C. Anterior ethmoid sinus
- D. Maxillary sinus (Correct Answer)
Explanation: ***Maxillary sinus*** - The **maxillary sinus** is the **largest paranasal sinus** (volume 15-20 ml) and drains directly into the **middle meatus** through the **semilunar hiatus** (ostium in the hiatus semilunaris) - Being both the largest and draining into the middle meatus, it satisfies both criteria in the question - Its clinical significance is highlighted by maxillary sinusitis being the most common type of sinusitis *Frontal sinus* - The **frontal sinus** drains into the **middle meatus** through the **frontonasal duct** (infundibulum) - While it drains to the middle meatus, it is **not the largest** paranasal sinus - the maxillary sinus is significantly larger - It is the second largest sinus after the maxillary sinus *Anterior ethmoid sinus* - The **anterior ethmoid sinuses** drain into the **middle meatus** via the **ethmoid bulla** and infundibulum - Like the frontal sinus, it drains to the middle meatus, but it is **not the largest** paranasal sinus - The ethmoid air cells are much smaller than the maxillary sinus *Posterior ethmoid sinus* - The **posterior ethmoid sinuses** drain into the **superior meatus**, **NOT the middle meatus** - This option fails to meet the drainage criterion specified in the question - This makes it incorrect regardless of size considerations
Question 1357: Which of the following structures is not found in the parotid gland?
- A. Buccal branch of mandibular nerve (Correct Answer)
- B. Facial nerve
- C. ECA
- D. Auriculotemporal nerve
Explanation: ***Buccal branch of mandibular nerve*** - The **buccal branch of the mandibular nerve (V3)** is not found within the parotid gland. It innervates the buccinator muscle and provides sensory innervation to the buccal mucosa. - The facial nerve, after exiting the stylomastoid foramen, branches within the parotid gland, but the *mandibular nerve* and its branches are distinct structures. *ECA* - The **external carotid artery (ECA)** runs *through* the parotid gland before dividing into its terminal branches, the superficial temporal and maxillary arteries. - This is a major landmark for surgeons operating on the parotid gland. *Facial nerve* - The **facial nerve (cranial nerve VII)** enters the parotid gland and then divides into its five terminal branches (temporal, zygomatic, buccal, marginal mandibular, cervical) *within* the gland. - These branches are responsible for innervating the muscles of facial expression. *Auriculotemporal nerve* - The **auriculotemporal nerve**, a branch of the mandibular nerve (V3), travels *through* the parotid gland. - It carries postganglionic parasympathetic fibers from the otic ganglion to the parotid gland, providing secretomotor innervation.
Question 1358: Which structure contributes to the formation of the arcuate eminence of the petrous temporal bone?
- A. Superior semicircular canal (Correct Answer)
- B. Posterior semicircular canal
- C. Lateral semicircular canal
- D. Cochlea
Explanation: ***Superior semicircular canal*** - The **superior semicircular canal** is positioned in such a way that its arch creates the **arcuate eminence** on the anterior surface of the petrous part of the temporal bone. - This anatomical relationship is a key landmark when viewing the internal aspect of the skull base. *Posterior semicircular canal* - The **posterior semicircular canal** is located more posteriorly and inferiorly within the petrous bone and does not contribute to the arcuate eminence. - It is oriented in a plane roughly perpendicular to the superior canal. *Lateral semicircular canal* - The **lateral semicircular canal** is situated horizontally and anteriorly within the petrous bone, also not forming the arcuate eminence. - It is responsible for detecting angular acceleration in the transverse plane. *Cochlea* - The **cochlea** is the organ of hearing, located anterior to the vestibule within the inner ear, and is not structurally related to the formation of the arcuate eminence. - Its spiral shape is distinct from the semicircular canals which sense head rotation.
Question 1359: Ascending pharyngeal artery is a branch of which?
- A. Arch of aorta
- B. Inferior thyroid artery
- C. Superior thyroid artery
- D. External carotid artery (Correct Answer)
Explanation: ***External carotid artery*** - The **ascending pharyngeal artery** is typically the first or second branch arising from the medial aspect of the **external carotid artery**. - It supplies structures in the pharynx, prevertebral muscles, palatine tonsil, and parts of the cranial nerves. *Arch of aorta* - The **arch of the aorta** gives rise to major arteries like the brachiocephalic trunk, left common carotid artery, and left subclavian artery [1]. - It does not directly supply arteries to the pharynx or neck at this level. *Inferior thyroid artery* - The **inferior thyroid artery** is a branch of the **thyrocervical trunk**, which in turn arises from the first part of the subclavian artery. - This artery mainly supplies the thyroid gland and adjacent structures but not directly the pharynx from this origin; the recurrent laryngeal nerve is often found in close proximity to its main trunk [1]. *Superior thyroid artery* - The **superior thyroid artery** is a direct branch of the **external carotid artery**, similar to the ascending pharyngeal artery, but it primarily supplies the thyroid gland, larynx, and infrahyoid muscles. - While it originates from the same major artery, it is a distinct branch with a different main distribution.
Question 1360: Which of the following is not a part of the ethmoidal bone?
- A. Uncinate process
- B. Agger nasi
- C. Crista galli
- D. Inferior nasal concha (Correct Answer)
Explanation: ***Inferior nasal concha*** - The **inferior nasal concha** is an independent facial bone, *not* a part of the ethmoid bone. - It forms the lower part of the lateral wall of the nasal cavity and has its own ossification centers separate from the ethmoid. *Uncinate process* - The **uncinate process** is a hook-shaped bony projection of the ethmoid bone. - It forms part of the medial wall of the **maxillary hiatus** and is crucial for the drainage of the paranasal sinuses. *Agger nasi* - The **agger nasi** (or nasal mound) is an anatomical variation which is an anterior extension of the ethmoid bone's uncinate process or an anterior ethmoid air cell. - It is located anterior and superior to the attachment of the middle turbinate, representing an ethmoidal cell. *Crista galli* - The **crista galli** is a strong, vertical, midline projection of the ethmoid bone. - It projects superiorly into the **cranial cavity** and serves as an attachment site for the **falx cerebri**. Note: None of the provided references contain anatomical descriptions of the ethmoid bone structures listed in this question. Therefore, no citations were added.
Practice by Chapter
Skull and Facial Bones
Practice Questions
Scalp and Facial Muscles
Practice Questions
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
Practice Questions
Applied Anatomy and Clinical Correlations
Practice Questions
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