Head — MCQs
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Which artery supplies the suprahyoid muscles in the floor of the mouth?
What is the ligament of Lockwood related to?
Which of the following does not give sensory supply to the pinna:
Which of the following structures does NOT pass through the palatovaginal canal?
Taste sensations from the posterior one-third of the tongue are carried by which nerve?
The action of the styloglossus muscle is
Which of the following drains into the middle meatus except?
All of the following bones are pneumatic, except:
Sublingual gland is situated between which structures?
Le Fort II fracture involves?
Head Indian Medical PG Practice Questions and MCQs
Question 1341: Which artery supplies the suprahyoid muscles in the floor of the mouth?
- A. Facial artery
- B. Lingual artery (Correct Answer)
- C. Maxillary artery
- D. Inferior alveolar artery
Explanation: ***Lingual artery*** - The **lingual artery**, a branch of the **external carotid artery**, is the **principal arterial supply** to the **floor of the mouth** and is considered the primary vessel for this region. - Its **sublingual branch** directly supplies the **geniohyoid muscle** and contributes to the vascular supply of other suprahyoid structures. - The lingual artery's extensive distribution in the floor of the mouth makes it the most significant vessel for this anatomical region overall. *Facial artery* - The **facial artery** supplies structures of the **face** and gives off the **submental branch** which supplies the **anterior belly of digastric** and **mylohyoid** muscle. - While it contributes to suprahyoid muscle supply, it is not considered the primary vessel for the floor of the mouth region. *Maxillary artery* - The **maxillary artery** supplies deep structures of the **face**, including the **muscles of mastication**, **teeth**, **palate**, and **nasal cavity**. - It does not directly supply the suprahyoid muscles in the floor of the mouth. *Inferior alveolar artery* - The **inferior alveolar artery** is a branch of the **maxillary artery** that gives off the **mylohyoid branch** before entering the mandibular foramen. - The **mylohyoid branch** supplies the **mylohyoid muscle** and **anterior belly of digastric**. - While this artery contributes significantly to individual suprahyoid muscles, the **lingual artery** is considered the principal vessel for the floor of the mouth region as a whole and is the standard answer for this anatomical area.
Question 1342: What is the ligament of Lockwood related to?
- A. Orbit (Correct Answer)
- B. Gallbladder
- C. Scrotum
- D. Lens
Explanation: ***Orbit*** - The **ligament of Lockwood** (or suspensory ligament of Lockwood) is a fibrous hammock-like structure underneath the **eyeball**. - It supports the **globe** and is formed by the fusion of the fascial sheaths of the **inferior rectus** and **inferior oblique muscles** [2]. *Gallbladder* - The gallbladder is supported by various peritoneal folds and attachments to the liver, but it does not have a structure known as the **ligament of Lockwood**. - Its position is primarily maintained by its connection in the **gallbladder fossa** of the liver and the **cystohepatic ligaments** [1]. *Scrotum* - The scrotum houses the testes and is primarily composed of fascial layers (e.g., **Dartos fascia**) and muscle, but it does not contain a structure referred to as the **ligament of Lockwood**. - Testicular suspension involves structures like the **spermatic cord** and **gubernaculum**. *Lens* - The **lens** of the eye is suspended by **zonular fibers** (also known as suspensory ligaments of the lens) which connect it to the **ciliary body**. - These are distinct from the **ligament of Lockwood**, which is an extraconal orbital structure.
Question 1343: Which of the following does not give sensory supply to the pinna:
- A. Lesser Occipital Nerve
- B. Tympanic branch of Glossopharyngeal Nerve (Correct Answer)
- C. Auriculotemporal Nerve
- D. Great Auricular Nerve
Explanation: ***Tympanic branch of Glossopharyngeal Nerve*** - The **tympanic branch of the glossopharyngeal nerve** (Jacobson's nerve) primarily provides **secretomotor innervation to the parotid gland** via the otic ganglion and sensory innervation to the **middle ear cavity** and **eustachian tube**, not the external ear or pinna. - It arises from the inferior ganglion of the glossopharyngeal nerve and plays no direct role in the sensory supply of the pinna. *Auriculotemporal Nerve* - The **auriculotemporal nerve**, a branch of the **mandibular nerve (V3)**, supplies sensation to the **anterior superior part of the pinna**, the tragus, and external auditory meatus. - It also carries postganglionic parasympathetic fibers to the parotid gland. *Great Auricular Nerve* - The **great auricular nerve**, a branch of the **cervical plexus (C2, C3)**, provides sensory innervation to the **inferior and posterior surfaces of the pinna**. - It also supplies sensation to the skin over the mastoid process and the angle of the mandible. *Lesser Occipital Nerve* - The **lesser occipital nerve**, also a branch of the **cervical plexus (C2)**, supplies sensation to the **posterior superior part of the pinna** and the skin behind the ear. - Its territory generally overlaps with the great auricular nerve in the posterior auricular region.
Question 1344: Which of the following structures does NOT pass through the palatovaginal canal?
- A. None of the above.
- B. Pharyngeal branch of the maxillary artery.
- C. Pharyngeal branch of the maxillary nerve. (Correct Answer)
- D. Branches of the pharyngeal nerves and vessels.
Explanation: ***Pharyngeal branch of the maxillary nerve.*** - The palatovaginal canal (also known as the **pharyngeal canal**) is located between the sphenoid and palatine bones. - This canal transmits the **pharyngeal branch of the maxillary artery** and the **pharyngeal nerve** (a branch from the pterygopalatine ganglion). - The **maxillary nerve (V2)** itself passes through the **foramen rotundum**, NOT the palatovaginal canal. - Therefore, a pharyngeal branch of the maxillary nerve does NOT pass through the palatovaginal canal, making this the correct answer to a "NOT" question. *Pharyngeal branch of the maxillary artery.* - The **pharyngeal branch of the maxillary artery** is a well-established structure that passes through the palatovaginal canal. - It supplies the roof of the nasopharynx, the sphenoidal sinus, and the auditory tube. - This is an actual content of the canal. *Branches of the pharyngeal nerves and vessels.* - The **pharyngeal nerve** (from the pterygopalatine ganglion) passes through the palatovaginal canal along with the pharyngeal branch of the maxillary artery. - These branches collectively supply the nasopharynx. - These are recognized contents of the canal. *None of the above.* - This option is incorrect because there IS a structure listed that does NOT pass through the canal. - The pharyngeal branch of the maxillary nerve is the correct answer, so "None of the above" is not applicable.
Question 1345: Taste sensations from the posterior one-third of the tongue are carried by which nerve?
- A. Glossopharyngeal (Correct Answer)
- B. Lingual
- C. Chorda tympani
- D. Vagus
Explanation: ***Glossopharyngeal*** - The **glossopharyngeal nerve (CN IX)** is responsible for conveying **taste sensation** from the posterior one-third of the tongue [1]. - It also provides general sensation to this region and motor innervation to the stylopharyngeus muscle. *Lingual* - The **lingual nerve** is a branch of the mandibular nerve (CN V3) and carries **general sensation** (touch, pain, temperature) from the anterior two-thirds of the tongue. - It does not carry taste sensation directly; taste fibers from the anterior two-thirds are carried by the chorda tympani, which joins the lingual nerve. *Chorda tympani* - The **chorda tympani** is a branch of the facial nerve (CN VII) and carries **taste sensation** from the anterior two-thirds of the tongue [1]. - It joins the lingual nerve but is distinct in its primary function of conveying taste. *Vagus* - The **vagus nerve (CN X)** innervates a small area of the **epiglottis** and the extreme posterior part of the pharynx for taste sensation [1]. - It does not primarily innervate the posterior one-third of the tongue for taste.
Question 1346: The action of the styloglossus muscle is
- A. Protrusion of tongue
- B. Posteriorly retracts the tongue (Correct Answer)
- C. Depression of tongue
- D. Elevation of tongue
Explanation: ***Posteriorly retracts the tongue*** - The **styloglossus muscle** originates from the styloid process and inserts into the tongue, pulling it **superiorly and posteriorly**. - Its primary action is to **retract the tongue** and draw its sides upward, contributing to the formation of a trough for swallowing. *Protrusion of tongue* - **Protrusion of the tongue** is primarily carried out by the **genioglossus muscle**, which pulls the tongue forward. - The styloglossus muscle has the opposite action, drawing the tongue backward. *Depression of tongue* - **Depression of the tongue** is mainly achieved by the **hyoglossus muscle**, which pulls the tongue downwards. - The styloglossus muscle retracts the tongue but does not primarily depress it. *Elevation of tongue* - While styloglossus does have a component of **elevation**, its main action is **retraction**. - Other muscles like the **palatoglossus** are more involved in the general elevation of the tongue.
Question 1347: Which of the following drains into the middle meatus except?
- A. Lacrimal duct (Correct Answer)
- B. Maxillary sinus
- C. Frontal sinus
- D. Ethmoidal sinus
Explanation: ***Lacrimal duct*** - The **nasolacrimal duct**, also known as the lacrimal duct, drains tears from the eye into the **inferior meatus** of the nasal cavity. - It is not associated with the drainage of the paranasal sinuses into the middle meatus. *Maxillary sinus* - The **maxillary sinus** drains into the **middle meatus** via the **semilunar hiatus**, an opening located on the lateral wall of the meatus. - Obstruction of this drainage can lead to **maxillary sinusitis**. *Frontal sinus* - The **frontal sinus** drains into the **middle meatus** via the **frontonasal duct**, which opens into the anterior part of the meatus, often into the ethmoidal infundibulum. - Its drainage is crucial for preventing the accumulation of mucus and infection in the forehead. *Ethmoidal sinus* - The **anterior ethmoidal cells** and **middle ethmoidal cells** drain into the **middle meatus**, typically into the ethmoidal infundibulum or onto the **ethmoidal bulla**. - Note: The **posterior ethmoidal cells** drain into the **superior meatus**, not the middle meatus.
Question 1348: All of the following bones are pneumatic, except:
- A. Frontal
- B. Ethmoid
- C. Mandible (Correct Answer)
- D. Maxilla
Explanation: ***Mandible*** - The mandible is a **dense bone** forming the lower jaw and does not contain air-filled spaces or sinuses. - It is crucial for **mastication** and speech, providing attachment for numerous muscles. *Maxilla* - The maxilla contains the **maxillary sinuses**, which are the largest paranasal sinuses. - These sinuses lighten the skull and contribute to voice resonance. *Frontal* - The frontal bone contains the **frontal sinuses**, located in the forehead region. - These are air-filled cavities that reduce the weight of the skull and produce mucus. *Ethmoid* - The ethmoid bone contains numerous small air cells known as the **ethmoidal sinuses**. - These sinuses are located between the eyes and drain into the nasal cavity.
Question 1349: Sublingual gland is situated between which structures?
- A. Hyoglossus and styloglossus muscles
- B. Genioglossus muscle and mandible (Correct Answer)
- C. Geniohyoid and genioglossus muscles
- D. Hyoglossus and genioglossus muscles
Explanation: ***Genioglossus muscle and mandible*** - The **sublingual gland** lies in the **sublingual fossa** on the medial aspect of the **mandible**. - It is positioned **laterally to the genioglossus muscle** (the gland sits between the mandible laterally and the genioglossus medially). - This makes the **mandible** and **genioglossus muscle** the two key structures between which the sublingual gland is situated. *Hyoglossus and styloglossus muscles* - The **styloglossus muscle** is located more superior and posterior, not adjacent to the sublingual gland. - The **hyoglossus muscle** forms part of the lateral wall of the tongue but is not one of the primary boundaries of the sublingual gland. *Geniohyoid and genioglossus muscles* - The **geniohyoid muscle** lies inferior to the genioglossus in the floor of the mouth. - While both are in the floor of the mouth, they do not form the immediate boundaries that define the position of the sublingual gland. *Hyoglossus and genioglossus muscles* - The **hyoglossus muscle** is positioned lateral to the posterior part of the submandibular duct. - While the hyoglossus has some relationship to structures in the floor of the mouth, the sublingual gland is primarily situated between the **mandible** and **genioglossus**, not between these two muscles.
Question 1350: Le Fort II fracture involves?
- A. Medial wall of orbit
- B. Lateral pyriform rims
- C. Mastoid process
- D. Inferior orbital rim (Correct Answer)
Explanation: ***Inferior orbital rim*** - A **Le Fort II fracture**, also known as a **pyramidal fracture**, characteristically involves the **inferior orbital rims** bilaterally. - This fracture pattern extends through the **nasal bones**, **maxilla**, **lacrimal bones**, and often the **palate**. *Medial wall of orbit* - While the medial wall of the orbit can be involved in complex midface fractures, it is not the defining characteristic of a **Le Fort II fracture**. - Fractures primarily involving the medial orbital wall are more typical of **orbital blowout fractures** or highly comminuted traumas. *Lateral pyriform rims* - The **pyriform aperture** (nasal cavity opening) is indeed involved in **Le Fort II fractures**, specifically its medial and superior aspects. However, the lateral pyriform rims themselves are not the hallmark feature. - Involvement of the lateral pyriform rims without extension through the inferior orbital rims would suggest a different fracture classification or potentially a more localized trauma. *Mastoid process* - The **mastoid process** is part of the temporal bone and is located in the posterior skull base. - Fractures of the mastoid process are associated with **basilar skull fractures** or direct trauma to the temporal region, and are not part of the standard Le Fort classification for midface fractures.
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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