Head — MCQs

Head Indian Medical PG Practice Questions and MCQs

Question 1311: Among the following trigeminal nerve divisions, which one is involved in orbital apex syndrome?

A. Olfactory nerve
B. Mandibular division of trigeminal nerve
C. Maxillary division of trigeminal nerve
D. Ophthalmic division of trigeminal nerve (Correct Answer)

Explanation: ***Ophthalmic division of trigeminal nerve*** - Orbital apex syndrome involves deficits of nerves passing through the **superior orbital fissure** and **optic canal**, which includes the ophthalmic division of the trigeminal nerve (CN V1). - Involvement of CN V1 leads to **sensory loss** in the forehead, upper eyelid, and side of the nose. *Olfactory nerve* - The **olfactory nerve (CN I)** is responsible for the sense of smell and does not pass through the orbital apex. - Its involvement would manifest as **anosmia**, which is not a characteristic feature of orbital apex syndrome. *Maxillary division of trigeminal nerve* - The **maxillary division (CN V2)** exits the skull through the **foramen rotundum** and innervates the midface. - It is generally **not involved** in orbital apex syndrome, as its anatomical course is distinct from the structures within the orbital apex. *Mandibular division of trigeminal nerve* - The **mandibular division (CN V3)** exits the skull through the **foramen ovale** and innervates the lower face and muscles of mastication. - Its involvement is **not associated** with orbital apex syndrome, as it is anatomically distant from the orbital apex.

Question 1312: What is the sensory nerve supply of the anterior two-thirds of the tongue?

A. Lingual Nerve (Correct Answer)
B. Maxillary Nerve
C. Glossopharyngeal Nerve
D. Chorda tympani

Explanation: Lingual Nerve - The lingual nerve, a branch of the mandibular nerve (V3), provides general sensory innervation to the anterior two-thirds of the tongue. - This includes touch, pain, and temperature sensation from this region. Maxillary Nerve - The maxillary nerve (V2) provides sensory innervation to the maxilla, upper teeth, palate, and part of the face, but not the tongue's general sensation. - Its sensory distribution is primarily to the mid-face region and upper jaw. Glossopharyngeal Nerve - The glossopharyngeal nerve (CN IX) provides general sensation and taste to the posterior one-third of the tongue. - This nerve is also responsible for innervating the stylopharyngeus muscle and parotid gland. Chorda tympani - The chorda tympani, a branch of the facial nerve (CN VII), carries taste sensation from the anterior two-thirds of the tongue. - It does not provide general sensation (pain, touch, temperature) for this part of the tongue.

Question 1313: What is the origin of the maxillary artery?

A. Maxillary artery.
B. Facial artery.
C. Angle of mandible.
D. External carotid artery. (Correct Answer)

Explanation: ***External carotid artery*** - The **maxillary artery** is the larger of the two terminal branches of the **external carotid artery**. - It originates posterior to the neck of the mandible and travels through the **infratemporal fossa**. *Angle of mandible* - The **angle of the mandible** is an anatomical landmark where the body and ramus of the mandible meet and is not an arterial origin. - While the maxillary artery passes near the mandible, it arises from a larger vessel, not directly from this bone. *Maxillary artery* - This option incorrectly states the artery as its own origin; the **maxillary artery** is itself a branch, not a parent vessel for its own origin. - When discussing the origin of an artery, we refer to the larger vessel from which it branches. *Facial artery* - The **facial artery** is another major branch of the **external carotid artery** but it supplies the face and superficial structures. - It does not give rise to the maxillary artery; they are both distinct branches from the same parent vessel.

Question 1314: Opening of the nasolacrimal duct is located at:

A. Inferior meatus (Correct Answer)
B. Superior meatus
C. Middle meatus
D. Sphenoethmoidal recess

Explanation: ***Inferior meatus*** - The **nasolacrimal duct** drains tears from the eye into the nasal cavity. - Its opening is located in the **anterior part of the inferior meatus**, beneath the inferior concha. *Superior meatus* - This meatus lies beneath the **superior concha** and receives drainage from the **posterior ethmoidal air cells**. - It does not receive the opening of the nasolacrimal duct. *Middle meatus* - The **middle meatus** is located beneath the middle meatus is located beneath the middle concha and receives drainage from the **frontal sinus**, **maxillary sinus**, and **anterior/middle ethmoidal air cells**. - The nasolacrimal duct does not open into this meatus. *Sphenoethmoidal recess* - This is a small space superior to the **superior concha** and receives the opening of the **sphenoid sinus**. - It is not associated with the drainage of the nasolacrimal duct.

Question 1315: Ethmoid bone articulates with which of the following?

A. Inferior turbinate (Correct Answer)
B. Middle turbinate
C. Superior turbinate
D. All of the options

Explanation: Inferior turbinate - The ethmoid bone forms the superior and middle conchae (turbinates) and articulates with the independent inferior nasal concha (inferior turbinate). - This articulation is crucial for forming the lateral wall of the nasal cavity. Middle turbinate - The middle turbinate is actually part of the ethmoid bone itself, specifically a downward projection from the ethmoid labyrinth. - Thus, it does not "articulate" with the ethmoid bone in the sense of two separate bones joining. Superior turbinate - Similar to the middle turbinate, the superior turbinate is also a part of the ethmoid bone. - It arises from the ethmoid labyrinth and does not form a distinct articulation with the main body of the ethmoid, but rather is a component of it. All of the options - This option is incorrect because only the inferior turbinate articulates with the ethmoid bone. The middle and superior turbinates are integral parts of the ethmoid bone.

Question 1316: The direction of the nasolacrimal duct is

A. Downwards, backwards and medially (Correct Answer)
B. Downwards, backwards and laterally
C. Downwards, forwards and medially
D. Downwards, forwards and laterally

Explanation: ***Downwards, backwards and medially*** - The **nasolacrimal duct** extends from the lacrimal sac in the lacrimal fossa and courses **inferiorly, posteriorly, and medially** through the nasolacrimal canal. - It opens into the **lateral wall of the inferior meatus** of the nasal cavity, meaning the duct travels **medially** from the orbit into the nasal cavity. - This anatomical orientation facilitates the drainage of tears from the eye into the nasal cavity. *Downwards, backwards and laterally* - While the duct does extend **downwards and backwards**, it courses **medially** from the orbit towards the nasal cavity, not laterally. - A lateral direction would lead away from the nasal cavity, contradicting its drainage function. *Downwards, forwards and medially* - The nasolacrimal duct courses **posteriorly (backwards)** as it descends, not forwards. - Though it does travel medially, the forward direction is anatomically incorrect. *Downwards, forwards and laterally* - The duct courses **posteriorly (backwards)**, not forwards. - Additionally, it travels **medially** into the nasal cavity, not laterally away from it.

Question 1317: Muscles of mastication are supplied by which nerve?

A. Mandibular nerve (CN V3) (Correct Answer)
B. Facial nerve (CN VII)
C. Hypoglossal nerve (CN XII)
D. Vagus nerve (CN X)

Explanation: ***Mandibular nerve (CN V3)*** - The **mandibular nerve (CN V3)** is a branch of the trigeminal nerve and provides **motor innervation** to all muscles of mastication. - The **four muscles of mastication** are: **masseter**, **temporalis**, **medial pterygoid**, and **lateral pterygoid**. - CN V3 also supplies some additional muscles: anterior belly of the digastric, mylohyoid, tensor tympani, and tensor veli palatini (though these are not classified as muscles of mastication). *Facial nerve (CN VII)* - The **facial nerve (CN VII)** is primarily responsible for innervating the **muscles of facial expression**. - It also carries taste sensation from the anterior two-thirds of the tongue and provides secretomotor innervation to some salivary and lacrimal glands. *Hypoglossal nerve (CN XII)* - The **hypoglossal nerve (CN XII)** provides **motor innervation** to the extrinsic and intrinsic muscles of the **tongue**. - It plays a crucial role in tongue movements involved in speech and swallowing but not mastication. *Vagus nerve (CN X)* - The **vagus nerve (CN X)** has extensive innervation, supplying structures in the pharynx, larynx, and most of the **thoracic and abdominal viscera**. - While it has motor functions in swallowing and speech (via pharyngeal and laryngeal muscles), it does not directly innervate the muscles of mastication.

Question 1318: Which part of the internal carotid artery does not give any branches?

A. Cervical part (Correct Answer)
B. Cavernous part
C. Cerebral part
D. Petrous part

Explanation: ***Cervical part*** - The **cervical portion** of the internal carotid artery ascends within the neck, and its primary function is to transport blood to the brain and other parts of the head without giving off any branches. - This segment is crucial for delivering blood flow to the intracranial circulation, and its lack of branches helps to maintain a consistent pressure gradient. *Cavernous part* - The cavernous part of the internal carotid artery gives off several branches, including the **meningohypophyseal trunk** and the **inferolateral trunk**. - These branches supply structures within the **cavernous sinus**, dura mater, and cranial nerves. *Cerebral part* - The **cerebral portion** of the internal carotid artery is highly branched, giving rise to major arteries like the **ophthalmic artery**, **posterior communicating artery**, and the **anterior and middle cerebral arteries**. - These branches are essential for supplying blood to the brain, eye, and associated structures. *Petrous part* - The **petrous part** of the internal carotid artery gives off the **caroticotympanic artery** and the **artery of the pterygoid canal (vidian artery)**. - These branches supply structures within the middle ear and pterygoid canal, respectively.

Question 1319: Which of the following is NOT a part of the medial wall of the orbit?

A. Tip of maxilla
B. Frontal bone (Correct Answer)
C. Ethmoid bone
D. Lacrimal bone

Explanation: ***Frontal bone*** - The **frontal bone** forms the **orbital roof** and contributes to the superior and superomedial orbital margins. - It does NOT form part of the **medial wall** of the orbit itself. - This is the correct answer to what is NOT part of the medial wall. *Ethmoid bone* - The **ethmoid bone**, specifically its **lamina papyracea** (orbital plate), forms the largest component of the **medial wall** of the orbit. - It is thin and fragile, separating the orbit from the ethmoid air cells. *Lacrimal bone* - The **lacrimal bone** is a small, delicate bone that forms part of the **anterior medial wall** of the orbit. - It lies between the frontal process of maxilla anteriorly and the lamina papyracea posteriorly. - It contains the lacrimal fossa that houses the lacrimal sac. *Tip of maxilla* - The **frontal process of the maxilla** forms the **anterior-most part** of the **medial wall** of the orbit. - It articulates with the frontal bone superiorly and the lacrimal bone posteriorly.

Question 1320: Which of the following parts of the nasal septum is the most common site for epistaxis?

A. Anterosuperior part of nasal septum
B. Posterosuperior part of nasal septum
C. Anteroinferior part of nasal septum (Correct Answer)
D. Posteroinferior part of nasal septum

Explanation: ***Anteroinferior part of nasal septum*** - This region contains **Kiesselbach's plexus** (also known as Little's area), a highly vascularized area located in the anteroinferior nasal septum where four major arteries anastomose (anterior ethmoidal, sphenopalatine, greater palatine, and superior labial arteries). - Due to its **superficial location** and **rich blood supply**, Kiesselbach's plexus is the most common site for **epistaxis** (nosebleeds), accounting for approximately 90% of anterior nosebleeds. - This area is easily accessible and prone to trauma from nose picking, dry air, and minor injuries. *Anterosuperior part of nasal septum* - While part of the anterior septum, this region does not contain the dense vascular network of Kiesselbach's plexus. - It is less commonly associated with epistaxis compared to the anteroinferior region. *Posterosuperior part of nasal septum* - This area is supplied by branches of the **sphenopalatine artery** (Woodruff's plexus) and is associated with **posterior epistaxis**, which is less common but potentially more severe. - Posterior nosebleeds account for only about 10% of all epistaxis cases and typically occur in elderly patients or those with hypertension. *Posteroinferior part of nasal septum* - This region has a relatively less dense vascular supply compared to the anteroinferior or posterosuperior parts. - It is not a primary site for epistaxis and is less clinically significant for nasal bleeding.

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