Head Practice Questions

Q: Taste buds are absent in which of the following lingual papillae?

Filiform papillae. ### Explanation The tongue is covered by four types of lingual papillae, which are mucosal projections on the dorsal surface [1]. The primary distinction among them is their function: some are specialized for **taste (gustatory)**, while others are specialized for **mechanical** purposes. **Why Filiform Papillae is the Correct Answer:** Filiform papillae are the most numerous and smallest papillae, covering most of the anterior two-thirds of the tongue. Unlike the other types, they **do not contain taste buds**. Their primary function is mechanical; they are highly keratinized, providing the tongue with a rough texture to increase friction for handling food. **Analysis of Incorrect Options:** * **Fungiform Papillae:** Mushroom-shaped structures scattered among the filiform papillae, mostly at the tip and sides [1]. They contain a few taste buds on their superior surface [1, 3]. * **Circumvallate Papillae:** The largest papillae, arranged in a V-shape just anterior to the sulcus terminalis [1]. Despite being few in number (8–12), they contain hundreds of taste buds located in their lateral walls [1]. * **Foliate Papillae:** Located as vertical folds on the posterolateral margins of the tongue [1]. They contain numerous taste buds, though they are more prominent in children than in adults [1]. **NEET-PG High-Yield Pearls:** * **Innervation:** Taste from the anterior 2/3 (Fungiform) is carried by the **Chorda Tympani (CN VII)**; the posterior 1/3 (Circumvallate and Foliate) is carried by the **Glossopharyngeal nerve (CN IX)**. * **Von Ebner’s Glands:** These are serous salivary glands associated specifically with **Circumvallate papillae** [1]. They secrete lingual lipase and wash out the troughs of the papillae to allow for new taste perceptions. * **Keratinization:** Filiform papillae are the only ones that are significantly keratinized, which is why they appear white in a healthy individual.

Q: Which of the following is FALSE regarding the posterior fontanelle?

Closes at 16-18 months. ### Explanation The **posterior fontanelle** (also known as the **Lambda**) is a small, triangular membranous gap located at the junction of the sagittal and lambdoid sutures [1]. **Why Option C is the correct (False) statement:** The posterior fontanelle typically closes much earlier than the anterior fontanelle. It usually closes by **2 to 3 months of age**. The timeframe of **18–24 months** (or 1.5–2 years) refers to the closure of the **anterior fontanelle** (Bregma). Therefore, Option C is factually incorrect regarding the posterior fontanelle. **Analysis of other options:** * **Option A (Estimating time of birth):** The state of closure of various fontanelles is a standard forensic and pediatric parameter used to estimate the age of an infant or the time elapsed since birth. * **Option B (Site for concealed trauma):** In cases of physical abuse (Shaken Baby Syndrome or direct trauma), the fontanelles can be sites where intracranial pressure changes are noted, or they may be used by perpetrators to inflict internal injury without leaving obvious marks on the scalp bones. * **Option D (Bones involved):** The posterior fontanelle is situated at the meeting point of the **two parietal bones** and the **one occipital bone** [1]. **NEET-PG High-Yield Pearls:** 1. **Anterior Fontanelle (Bregma):** Largest, diamond-shaped, closes at 18–24 months. It is used to assess hydration (sunken in dehydration) and intracranial pressure (bulging in meningitis). 2. **Posterior Fontanelle (Lambda):** Triangular, closes at 2–3 months. 3. **Clinical Significance:** Delayed closure of fontanelles is seen in **Rickets, Cretinism (Hypothyroidism), and Hydrocephalus**. 4. **Vertex:** The area of the skull between the anterior and posterior fontanelles.

Q: The temporalis muscle is inserted into which part of the mandible?

Coronoid process. **Explanation:** The **temporalis muscle** is a powerful fan-shaped muscle of mastication. It originates from the floor of the temporal fossa and the temporal fascia. Its fibers converge inferiorly to form a tendon that passes deep to the zygomatic arch. **Why the Coronoid Process is Correct:** The primary insertion of the temporalis muscle is the **apex and medial surface of the coronoid process** of the mandible. The insertion also extends down the **anterior border of the ramus** of the mandible, nearly as far as the third molar tooth. Its primary action is to elevate the mandible (closing the jaw) and its posterior horizontal fibers retract the mandible. **Analysis of Incorrect Options:** * **A. Condylar process:** This is the insertion site for the **Lateral pterygoid muscle** (specifically the pterygoid fovea on the neck of the condyle). * **C. Lingula:** This is a bony prominence over the mandibular foramen where the **sphenomandibular ligament** attaches. * **D. Ramus of the mandible:** While the temporalis does extend to the anterior border of the ramus, the **Masseter muscle** is the primary muscle inserted into the lateral surface of the ramus, and the **Medial pterygoid** inserts into the medial surface near the angle. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve Supply:** Deep temporal branches of the **mandibular nerve (V3)**. * **Action:** It is the only muscle of mastication that **retracts** the mandible (via posterior fibers). * **Clinical Significance:** In cases of mandibular dislocation, the temporalis and masseter muscles undergo protective spasms, making manual reduction difficult without relaxation. * **Development:** Like all muscles of mastication, it develops from the **1st Pharyngeal Arch**.

Q: Where is a Stafne cyst typically found?

Below the mandibular canal. ### Explanation **Stafne Cyst** (also known as Stafne bone defect or Static bone cyst) is not a true cyst but rather a developmental depression on the lingual surface of the mandible. **Why Option A is correct:** The Stafne cyst is classically located in the **posterior mandible, below the mandibular canal**, between the mandibular angle and the first molar. Anatomically, this radiolucency is caused by a deep cortical depression created by the ectopic or hypertrophic **submandibular salivary gland** tissue resting against the bone. Because the submandibular gland sits inferior to the mylohyoid muscle and the mandibular canal, the defect consistently appears in this inferior position. **Analysis of Incorrect Options:** * **Option B:** Lesions above the mandibular canal are typically odontogenic (related to teeth) in origin. Stafne cysts are non-odontogenic and strictly sub-canal. * **Option C & D:** While the Stafne cyst is located **below the mylohyoid ridge** (making D technically plausible in a general sense), the most specific and diagnostic radiographic landmark used in exams is its relationship to the **mandibular canal**. In clinical anatomy, "below the mandibular canal" is the pathognomonic descriptor for its location on a panoramic X-ray. **High-Yield Clinical Pearls for NEET-PG:** * **Nature:** It is a **pseudocyst** because it lacks an epithelial lining. * **Radiographic Appearance:** A well-defined, ovoid, unilocular radiolucency with a thick sclerotic border. * **Asymptomatic:** It is usually an incidental finding on a panoramic radiograph (OPG). * **Management:** No treatment is required ("Static" bone defect); it does not grow or undergo malignant transformation. * **Anterior Variant:** A rare variant exists in the incisor/canine region, associated with the **sublingual gland**.

Q: Following injection of local anesthesia for lower molar extraction using a classical inferior alveolar nerve block, which space has the highest chance of infection?

Pterygomandibular space. **Explanation:** The **Pterygomandibular space** is the correct answer because it is the specific anatomical site where the local anesthetic is deposited during a classical inferior alveolar nerve block (IANB). **1. Why Pterygomandibular Space is Correct:** The IANB aims to deposit anesthesia near the mandibular foramen. This foramen is located within the pterygomandibular space, which is bounded laterally by the ramus of the mandible and medially by the medial pterygoid muscle. If the needle is contaminated or if an infection is present at the injection site, the needle can track microorganisms directly into this potential space, leading to a pterygomandibular space abscess. **2. Why Other Options are Incorrect:** * **Lateral pharyngeal / Parapharyngeal space:** These terms are often used interchangeably. While the pterygomandibular space communicates posteriorly with the parapharyngeal space, it is not the primary site of deposition. Infection here is usually a secondary spread from the pterygomandibular space or tonsillar infections. * **Pretracheal space:** This is located in the neck, anterior to the trachea. It is anatomically distant from the site of a dental block and is typically involved in infections originating from the thyroid, esophagus, or trachea. **High-Yield Clinical Pearls for NEET-PG:** * **Boundaries:** Pterygomandibular space contains the Inferior Alveolar Nerve, Artery, and Vein, and the Lingual Nerve. * **Trismus:** A common sign of infection or hematoma in this space is trismus (difficulty opening the mouth) due to irritation of the medial pterygoid muscle. * **Needle Landmark:** The needle passes through the buccinator muscle to reach this space during an IANB.

Question 1

Taste buds are absent in which of the following lingual papillae?

Accepted Answer

Filiform papillae

Answer

Fungiform papillae

Answer

Circumvallate papillae

Answer

Foliate papillae

Question 2

Which of the following is FALSE regarding the posterior fontanelle?

Accepted Answer

Closes at 16-18 months

Answer

Helps in estimating the time of birth

Answer

Site for concealed trauma

Answer

Formed by the parietal and occipital bones

Question 3

A patient has an invasive tumor in the cavernous sinus. Which of the following signs is NOT typically present in such a patient?

Accepted Answer

Weakness in screwing the eyes up tightly

Answer

A dilated pupil

Answer

A drooping eyelid

Answer

A deviated eye looking down and laterally

Question 4

The temporalis muscle is inserted into which part of the mandible?

Accepted Answer

Coronoid process

Answer

Condylar process

Answer

Lingula

Answer

Ramus of the mandible

Question 5

Which of the following statements is NOT true regarding the pterygopalatine fossa?

Accepted Answer

Medially, the pterygopalatine fossa communicates with the infratemporal fossa through the pterygomaxillary fissure.

Answer

Inferomedial to the foramen rotundum lies the Vidian (Pterygoid) canal, which connects the foramen lacerum to the pterygopalatine fossa.

Answer

It communicates with the middle cranial cavity through the foramen rotundum and pterygoid canal.

Answer

It contains the sphenopalatine ganglion and the third segment of the maxillary artery.

Question 6

Where is a Stafne cyst typically found?

Accepted Answer

Below the mandibular canal

Answer

Above the mandibular canal

Answer

Above the mylohyoid ridge

Answer

Below the mylohyoid ridge

Question 7

Following injection of local anesthesia for lower molar extraction using a classical inferior alveolar nerve block, which space has the highest chance of infection?

Accepted Answer

Pterygomandibular space

Answer

Lateral pharyngeal space

Answer

Parapharyngeal space

Answer

Pretracheal space

Question 8

Which of the following muscles is not supplied by the mandibular nerve?

Accepted Answer

Posterior belly of digastric

Answer

Masseter

Answer

Buccinator

Answer

Tensor veli palati

Question 9

Which of the following cavities are separated from the middle cranial fossa by a thin layer of bone?

Accepted Answer

Middle ear cavity and sphenoid sinus

Answer

Auditory tube and bony orbit

Answer

Sigmoid sinus and frontal sinus

Answer

Sphenoid sinus and ethmoid sinus

Question 10

Anteroposterior stability of the eyeball is provided by all except:

Accepted Answer

Suspensory ligament of the eyeball

Answer

Superior oblique

Answer

Superior rectus

Answer

Orbital fat

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