Head — MCQs

Head Indian Medical PG Practice Questions and MCQs

Question 1321: The tensor tympani muscle is inserted into the handle of the malleus. What is the nerve supply to the tensor tympani?

A. Glossopharyngeal nerve
B. Trigeminal nerve (Correct Answer)
C. Facial nerve
D. Vagus nerve

Explanation: ***Trigeminal nerve*** - The **tensor tympani muscle** is innervated by a branch off the **mandibular division (V3)** of the trigeminal nerve. - This muscle helps to dampen loud sounds by pulling the **malleus** medially, increasing tension on the **tympanic membrane**. *Vagus nerve* - The **vagus nerve (CN X)** primarily innervates structures in the pharynx, larynx, and abdominal viscera. - It has no direct motor innervation to the muscles of the middle ear. *Glossopharyngeal nerve* - The **glossopharyngeal nerve (CN IX)** primarily supplies the **stylopharyngeus muscle**, the parotid gland, and provides sensation to the posterior tongue. - It does not innervate the tensor tympani muscle. *Facial nerve* - The **facial nerve (CN VII)** innervates the **stapedius muscle** in the middle ear, which also functions to dampen sounds. - It does not, however, innervate the tensor tympani muscle.

Question 1322: Which nerve provides sensory supply to the vocal cords?

A. Recurrent laryngeal nerve
B. Internal laryngeal nerve (Correct Answer)
C. Superior laryngeal nerve
D. All of the options

Explanation: ***Internal laryngeal nerve*** - This nerve, a branch of the **superior laryngeal nerve**, is entirely sensory. - It provides **sensation to the laryngeal mucosa from the epiglottis down to and including the vocal folds**. - This is the **primary sensory nerve** to the vocal cords, particularly their superior surface. *Recurrent laryngeal nerve* - This nerve is primarily **motor**, innervating all intrinsic laryngeal muscles except the cricothyroid [1]. - It also provides sensory innervation to the **laryngeal mucosa below the vocal folds** and the inferior surface of the vocal cords [1]. - While it contributes some sensory supply, it is not the primary sensory nerve to the vocal cords. *Superior laryngeal nerve* - This nerve divides into the internal and external laryngeal nerves. - The internal branch provides the sensation, but the **superior laryngeal nerve itself** as a complete nerve trunk is not the specific answer. - The **internal laryngeal branch** is the precise anatomical structure responsible. *All of the options* - This is incorrect because while both internal and recurrent laryngeal nerves contribute sensory fibers, the **internal laryngeal nerve** is recognized as the **primary sensory nerve** to the vocal cords. - The superior laryngeal nerve acts through its internal branch, not as a direct supplier.

Question 1323: A patient who suffered a trauma to the face and was brought to the emergency room was unable to chew their food. On examination, their jaw deviates to the right side. Which foramen does the injured mandibular nerve exit through?

A. Foramen Lacerum
B. Foramen Jugulare
C. Foramen Ovale (Correct Answer)
D. Foramen Spinosum

Explanation: Foramen Ovale - The mandibular nerve (V3), a branch of the trigeminal nerve, exits the skull through the foramen ovale. - Injury to this nerve can lead to paralysis of the muscles of mastication, causing deviation of the jaw towards the affected side due to the unopposed action of the contralateral pterygoid muscles. Foramen Lacerum - This foramen is typically filled with cartilage in vivo and is not a usual exit point for major nerves involved in mastication. - It transmits the greater petrosal nerve and the internal carotid artery, among other structures. Foramen Jugulare - The jugular foramen transmits cranial nerves IX (glossopharyngeal), X (vagus), and XI (accessory), along with the internal jugular vein. - These nerves are primarily involved in swallowing, speech, and neck movement, not directly in mastication or jaw deviation. Foramen Spinosum - The foramen spinosum transmits the middle meningeal artery and the nervus spinosus (a branch of the mandibular nerve). - While it's associated with the mandibular nerve, it's not the primary exit point for the main trunk of V3 that innervates the muscles of mastication.

Question 1324: The temporalis muscle originates from:

A. Zygomatic process
B. Ramus of the mandible
C. Pterygopalatine fossa
D. Temporal fossa (Correct Answer)

Explanation: ***Temporal fossa (Correct)*** - The **temporalis muscle** is a large, fan-shaped muscle of mastication that covers the side of the skull. - Its broad origin includes the entire **temporal fossa**, which is located on the lateral surface of the skull superior to the zygomatic arch. - The muscle also originates from the **temporal fascia** covering the fossa. *Zygomatic process (Incorrect)* - The **zygomatic process** of the temporal bone contributes to the zygomatic arch, which the temporalis muscle passes *under* to insert onto the mandible. - It serves as an attachment site for muscles like the **masseter**, but not the primary origin for the temporalis. *Ramus of the mandible (Incorrect)* - The **ramus of the mandible** is the vertical part of the lower jaw, which serves as the primary **insertion point** for the temporalis muscle, not its origin. - The temporalis inserts into the **coronoid process** and the anterior border of the ramus. *Pterygopalatine fossa (Incorrect)* - The **pterygopalatine fossa** is a small, inverted pyramidal space located deep within the skull, anterior to the sphenoid bone. - It contains nerves and vessels but is not involved in the origin or insertion of the **temporalis muscle**.

Question 1325: Which of the following statements about the facial vein is incorrect?

A. Contains valves that prevent backflow (Correct Answer)
B. Largest vein of face
C. Drains into internal jugular vein
D. Formed from angular vein

Explanation: ***Contains valves that prevent backflow*** - The facial vein is notably **valveless or has very few non-functional valves**, making this statement incorrect. - This absence of functional valves is **clinically significant** as it allows **bidirectional flow of blood**. - This characteristic can contribute to the spread of **infections from the face to intracranial sinuses** (dangerous triangle of the face). *Largest vein of face* - While the facial vein is significant, the **retromandibular vein** is generally considered larger. - However, the facial vein is still one of the major venous drainage routes of the face. *Drains into internal jugular vein* - The facial vein typically drains into the **internal jugular vein** in the neck. - This may be directly or via the **common facial vein** (union of facial and anterior branch of retromandibular vein). *Formed from angular vein* - The facial vein begins as the **angular vein** at the medial angle of the eye. - The angular vein is formed by the union of the **supratrochlear** and **supraorbital veins**.

Question 1326: Among the following, which nerve contributes to the sensory innervation of the tympanic membrane?

A. Lesser occipital
B. Greater occipital
C. Tympanic nerve
D. Auriculotemporal (Correct Answer)

Explanation: ***Auriculotemporal*** - The **auriculotemporal nerve**, a branch of the **mandibular nerve (V3)**, provides sensory innervation to the **anterosuperior part of the external (lateral) surface** of the tympanic membrane. - It also supplies the external acoustic meatus and is a key contributor to sensory innervation of this region. - This is the most commonly cited nerve for tympanic membrane sensory innervation in clinical contexts. *Lesser occipital* - The **lesser occipital nerve** is a branch of the **cervical plexus (C2-C3)** and provides sensory innervation to the skin over the lateral scalp posterior to the ear and the mastoid process. - It does **not** innervate the tympanic membrane. *Greater occipital* - The **greater occipital nerve** arises from the **dorsal ramus of C2** and supplies the posterior scalp extending to the vertex. - It has **no role** in tympanic membrane innervation. *Tympanic nerve* - The **tympanic nerve (Jacobson's nerve)**, a branch of the **glossopharyngeal nerve (CN IX)**, provides sensory innervation to the **medial (internal) surface** of the tympanic membrane and the mucosa of the middle ear cavity. - It also carries **parasympathetic fibers** that eventually reach the parotid gland via the otic ganglion. - While it does contribute to tympanic membrane sensation, the auriculotemporal nerve is more commonly emphasized for the **external surface** innervation in standard anatomy teaching.

Question 1327: The two roots of the auriculotemporal nerve encircle which structure?

A. Anterior tympanic artery
B. Middle meningeal artery (Correct Answer)
C. Superficial temporal vein
D. Superficial temporal artery

Explanation: **Middle meningeal artery** - The **auriculotemporal nerve** typically splits into two roots that **encircle** the **middle meningeal artery** as it passes through the foramen spinosum. - This anatomical relationship is a crucial landmark in understanding the nerve's course and potential for compression. *Anterior tympanic artery* - The **anterior tympanic artery** is a branch of the **maxillary artery** that supplies the tympanic cavity, but it is not encircled by the roots of the auriculotemporal nerve. - Its anatomical course is distinct from the path taken by the auriculotemporal nerve roots. *Superficial temporal vein* - The **superficial temporal vein** accompanies the superficial temporal artery and is located more superficially in the temporal region. - It does not have the same close anatomical relationship with the roots of the auriculotemporal nerve as the middle meningeal artery. *Superficial temporal artery* - The **superficial temporal artery** is a terminal branch of the external carotid artery, but it is not encircled by the roots of the auriculotemporal nerve. - While the auriculotemporal nerve runs with the superficial temporal artery in its distal course, the initial anatomical relationship of the nerve roots is with the middle meningeal artery.

Question 1328: The tonsillar artery, which is the principal arterial supply to the palatine tonsil, is a branch of which artery?

A. Lingual artery
B. Superficial temporal artery
C. Maxillary artery
D. Facial artery (Correct Answer)

Explanation: ***Facial artery*** - The **tonsillar artery** is a direct branch of the **facial artery**, providing a significant blood supply to the palatine tonsils. - The facial artery originates from the **external carotid artery** and has multiple branches supplying structures in the face and neck. *Lingual artery* - The lingual artery primarily supplies the **tongue** and the floor of the mouth. - It does not have branches that directly supply the tonsils. *Superficial temporal artery* - The superficial temporal artery is a terminal branch of the **external carotid artery** that supplies the temporal region and scalp. - It is not involved in the blood supply of the palatine tonsils. *Maxillary artery* - The maxillary artery is a large terminal branch of the **external carotid artery** that supplies deep structures of the face, nasal cavity, and skull. - While it has numerous branches in the region, the tonsillar artery specifically originates from the facial artery, not the maxillary artery.

Question 1329: Kisselbach's plexus is situated in which part of the nasal cavity?

A. Anteroinferior part of nasal septum (Correct Answer)
B. Woodruff's area
C. Near superior turbinate
D. Posterior nasal cavity

Explanation: ***Anteroinferior part of nasal septum*** - Kisselbach's plexus, also known as Little's area, is a dense vascular network formed by anastomoses of several arteries in the **anteroinferior septum**. - It is the most common site for **anterior epistaxis** (nosebleeds) due to its superficial location and exposure to trauma and dryness. *Woodruff's area* - Woodruff's area is located on the **posterior nasopharyngeal wall** just inferior to the posterior end of the inferior turbinate. - This area is primarily involved in **posterior epistaxis** and is supplied by branches of the sphenopalatine and ascending pharyngeal arteries. *Near superior turbinate* - The area near the superior turbinate typically contains the openings for the **posterior ethmoid air cells** and sphenoid sinus, but not a distinct vascular plexus like Kisselbach's. - While it has vascular supply, it is not recognized as a common site for nosebleeds or a specific plexus. *Posterior nasal cavity* - The posterior nasal cavity is a general region, and while it contains blood vessels, the most concentrated and clinically significant plexus in this area for epistaxis is **Woodruff's area**, not Kisselbach's. - Bleeding from the posterior nasal cavity is typically more severe and difficult to manage than anterior bleeds from Kisselbach's plexus.

Question 1330: All of the following structures are associated with branches of the trigeminal nerve except for which of the following?

A. Superior orbital fissure
B. Stylomastoid foramen (Correct Answer)
C. Foramen ovale
D. Foramen rotundum

Explanation: ***Stylomastoid foramen*** - The stylomastoid foramen is the exit point for the **facial nerve (cranial nerve VII)** from the skull, not a branch of the trigeminal nerve. - It transmits the facial nerve after it passes through the **temporal bone**. *Foramen ovale* - The foramen ovale transmits the **mandibular division (V3)** of the trigeminal nerve, along with the accessory meningeal artery and lesser petrosal nerve. - It is a key opening for the **sensory and motor innervation** of the lower jaw and muscles of mastication. *Foramen rotundum* - The foramen rotundum is exclusively for the passage of the **maxillary division (V2)** of the trigeminal nerve. - This nerve branch provides sensation to the **midface**, upper teeth, and palate. *Superior orbital fissure* - The superior orbital fissure allows passage for the **ophthalmic division (V1)** of the trigeminal nerve, along with cranial nerves III, IV, VI, and ophthalmic veins. - This division provides **sensory innervation** to the forehead, upper eyelid, and part of the nose.

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