Head Practice Questions

Q: Which part of the external auditory canal is cartilaginous?

Lateral 1/3 (Cartilaginous). ***Lateral 1/3 (Cartilaginous)*** - The **external auditory canal** is composed of a **lateral cartilaginous portion** and a **medial osseous (bony) portion**. - The cartilaginous part forms approximately the **outer one-third (lateral 1/3)** of the canal and is continuous with the cartilage of the auricle. - This is the **correct answer** to the question. *Lateral 2/3 (Cartilaginous)* - This incorrectly states that **two-thirds** of the canal is cartilaginous. - In reality, only the **lateral 1/3** is cartilaginous, while the **medial 2/3** is osseous (bony). *Medial 2/3 (Osseous)* - This statement is **anatomically correct** - the medial 2/3 of the external auditory canal is indeed osseous. - However, the question asks for the **cartilaginous part**, not the osseous part. *Medial 1/3 (Osseous)* - This is **anatomically incorrect** as it suggests only **1/3** of the canal is osseous. - The **osseous (bony) part** actually constitutes the **medial 2/3** of the external auditory canal, not 1/3.

Q: Which of the following statements about diploic veins is false?

Contain valves like other peripheral veins. ***Contain valves like other peripheral veins*** - This statement is **false**. Diploic veins are notable for their **lack of valves**, which is a crucial anatomical feature distinguishing them from typical peripheral veins that contain valves to prevent backflow. - Their valveless nature allows for pressure equalization between intracranial and extracranial venous systems. *These have no valves* - This statement is **true** about diploic veins. They are unique in that they **lack valves**, which facilitates bidirectional blood flow. - The absence of valves is a key characteristic that distinguishes diploic veins from most peripheral veins. *Present in cranial bones* - This statement is **true**. Diploic veins are specifically located within the **cancellous bone** (diploë) of the cranial vault. - They connect the meningeal veins, dural venous sinuses, and veins of the scalp. *Have a thin wall lined by single layer of endothelium* - This statement is **true**. Diploic veins, like most veins, have relatively **thin walls** compared to arteries [1]. - Their inner lining is composed of a single layer of **endothelial cells**, which is characteristic of the vascular system [1].

Q: Which one of the following is a branch of the first part of the maxillary artery?

Anterior tympanic. ***Anterior tympanic*** - This artery arises from the **first part** (mandibular part) of the maxillary artery. - It supplies structures within the **tympanic cavity**, including the inner surface of the tympanic membrane. - Among the options listed, this is a **classic branch** consistently mentioned in anatomy texts. *Anterior ethmoidal* - This artery is a branch of the **ophthalmic artery**, which itself is a branch of the internal carotid artery, **not the maxillary artery**. - It supplies the **ethmoid air cells**, frontal sinus, and nasal cavity. - This is the **definitively incorrect option** as it does not arise from the maxillary artery at all. *Middle meningeal* - This artery **also arises from the first part** (mandibular part) of the maxillary artery. - It is a significant artery that supplies the **dura mater** and cranial bones. - While anatomically correct, **anterior tympanic** is the more specific answer being tested in this context. *Inferior alveolar* - This artery **also arises from the first part** (mandibular part) of the maxillary artery. - It descends to supply the **mandible**, its teeth, and the lower lip and chin. - While anatomically correct, it is not the best answer in this specific question context.

Q: During examination of the parotid gland, the parotid duct can be palpated at the following locations except:

At the opening just opposite to upper second molar. ***At the opening just opposite to upper second molar*** - This location refers to the **intraoral opening** of the parotid duct (Stensen's duct), where it opens into the oral vestibule. - This opening is **mucosal and internal**, and cannot be palpated from the exterior during clinical examination. - Palpation of the parotid duct refers to external bimanual palpation through the cheek. *Anterior border of masseter* - The parotid duct crosses the **anterior border of the masseter muscle** superficially before turning medially. - This is the **most common location** for external palpation of the duct - it can be felt by pressing the cheek against the masseter. *Where it pierces the buccinator* - While the duct does pierce the buccinator muscle, at this point it becomes **deep and intramucosal**. - External palpation becomes difficult once the duct enters the buccinator, though the duct may still be felt along its course just before piercing. *At the anterior border of parotid gland* - The parotid duct emerges from the **anterior border of the parotid gland** and runs anteriorly across the masseter. - This is the **initial segment** of the duct's superficial course and can be palpated externally.

Q: What is the ligament of Lockwood related to?

Orbit. ***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.

Q: Taste sensations from the posterior one-third of the tongue are carried by which nerve?

Glossopharyngeal. ***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.

Q: Which of the following structures does NOT pass through the palatovaginal canal?

Pharyngeal branch of the maxillary nerve.. ***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.

Q: Which of the following does not give sensory supply to the pinna:

Tympanic branch of Glossopharyngeal Nerve. ***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.

Q: A young girl presents with symptoms of nasal and palatal dryness. Which ganglion is likely affected?

Pterygopalatine ganglion. ***Pterygopalatine ganglion*** - The **pterygopalatine ganglion** is the primary source of **parasympathetic innervation** for the **nasal** and **palatal mucosa**, including their glands that produce secretions for moisture. - Damage to this ganglion would impair the secretomotor function, leading to **dryness in these regions**. *Nodose ganglion* - The **nodose ganglion** is a **sensory ganglion of the vagus nerve (CN X)**, primarily involved in visceral sensation from the thoracic and abdominal organs. - It does not directly innervate glands of the nasal or palatal mucosa, so its damage would not cause dryness in these areas. *Otic ganglion* - The **otic ganglion** provides **parasympathetic innervation** to the **parotid gland**, controlling saliva production from this gland. - Lesion to the otic ganglion would primarily affect parotid gland function, leading to symptoms like dry mouth, but not specifically nasal or palatal dryness. *Submandibular ganglion* - The **submandibular ganglion** provides **parasympathetic secretomotor innervation** to the **submandibular** and **sublingual salivary glands**. - Damage would lead to reduced saliva production from these glands, causing dry mouth, but not specifically nasal or palatal dryness.

Question 1

Which part of the external auditory canal is cartilaginous?

Accepted Answer

Lateral 1/3 (Cartilaginous)

Answer

Lateral 2/3 (Cartilaginous)

Answer

Medial 2/3 (Osseous)

Answer

Medial 1/3 (Osseous)

Question 2

Which of the following statements about diploic veins is false?

Accepted Answer

Contain valves like other peripheral veins

Answer

Present in cranial bones

Answer

These have no valves

Answer

Have a thin wall lined by single layer of endothelium

Question 3

Which one of the following is a branch of the first part of the maxillary artery?

Accepted Answer

Anterior tympanic

Answer

Middle meningeal

Answer

Inferior alveolar

Answer

Anterior ethmoidal

Question 4

During examination of the parotid gland, the parotid duct can be palpated at the following locations except:

Accepted Answer

At the opening just opposite to upper second molar

Answer

At the anterior border of parotid gland

Answer

Where it pierces the buccinator

Answer

Anterior border of masseter

Question 5

What is the ligament of Lockwood related to?

Accepted Answer

Orbit

Answer

Gallbladder

Answer

Scrotum

Answer

Lens

Question 6

Taste sensations from the posterior one-third of the tongue are carried by which nerve?

Accepted Answer

Glossopharyngeal

Answer

Lingual

Answer

Chorda tympani

Answer

Vagus

Question 7

Which of the following structures does NOT pass through the palatovaginal canal?

Accepted Answer

Pharyngeal branch of the maxillary nerve.

Answer

None of the above.

Answer

Pharyngeal branch of the maxillary artery.

Answer

Branches of the pharyngeal nerves and vessels.

Question 8

Which nerve is responsible for supplying the posterior semicircular canal?

Accepted Answer

Inferior vestibular nerve supplying posterior semicircular canal

Answer

Superior vestibular nerve supplying posterior semicircular canal

Answer

Superior vestibular nerve supplying anterior semicircular canal

Answer

Inferior vestibular nerve supplying anterior semicircular canal

Question 9

Which of the following does not give sensory supply to the pinna:

Accepted Answer

Tympanic branch of Glossopharyngeal Nerve

Answer

Lesser Occipital Nerve

Answer

Auriculotemporal Nerve

Answer

Great Auricular Nerve

Question 10

A young girl presents with symptoms of nasal and palatal dryness. Which ganglion is likely affected?

Accepted Answer

Pterygopalatine ganglion

Answer

Otic ganglion

Answer

Nodose ganglion

Answer

Submandibular ganglion

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