Head & Neck Practice Questions

Q: A histology slide from a routine autopsy is shown. The image reveals a tubular structure whose wall contains an inner oblique, middle circular, and outer longitudinal smooth muscle layer. The mucosa is lined by simple columnar epithelium with prominent gastric pits, and the lamina propria contains straight tubular glands extending the full depth of the mucosa with parietal (oxyntic) cells and chief cells that open into the base of the pits. The submucosa is unremarkable. Which region of the gastrointestinal tract does this specimen most likely represent?

Fundus of the stomach. ***Fundus of the stomach*** - The presence of **parietal (oxyntic) cells** and **chief cells** within straight tubular glands that extend the full depth of the mucosa is characteristic of the fundic and body regions of the stomach. - The stomach is unique in the gastrointestinal tract for having a three-layered **muscularis externa** consisting of an **inner oblique**, **middle circular**, and **outer longitudinal** smooth muscle layer. *Cardiac region of the stomach* - The cardia is primarily characterized by **mucous-secreting glands** that are shorter and often branched compared to the fundus. - **Parietal and chief cells** are typically absent or very sparse in this specific region of the stomach. *Pyloric region of the stomach* - The pylorus features very **deep gastric pits** (occupying about half the mucosal thickness) and short, coiled, branched glands. - The glands in this region consist almost entirely of **mucous cells** and G-cells, lacking the high density of **parietal and chief cells** found in the fundus. *First part of the duodenum* - The duodenum is identified by the presence of **Brunner's glands** in the submucosa, which were explicitly described as unremarkable in this specimen. - It lacks an **inner oblique muscle layer** and features a mucosa with **villi and crypts of Lieberkuhn** rather than gastric pits and fundic glands. *Gastroesophageal junction* - This region marks a sharp transition from **stratified squamous epithelium** of the esophagus to the **simple columnar epithelium** of the stomach. - The esophageal side would contain **esophageal cardiac glands** in the lamina propria and would not demonstrate the triple-layered smooth muscle architecture of the gastric wall.

Q: Impaired gag reflex is seen due to a lesion in which cranial nerves?

CN IX & X. ***Correct: CN IX & X*** The **gag reflex (pharyngeal reflex)** is a protective reflex involving two cranial nerves: - **Afferent limb**: **CN IX (Glossopharyngeal nerve)** provides sensory innervation to the posterior third of the tongue, oropharynx, and pharyngeal walls - **Efferent limb**: **CN X (Vagus nerve)** provides motor innervation to the pharyngeal muscles (via the pharyngeal plexus) that contract during the reflex **Clinical correlation**: Testing the gag reflex helps assess brainstem function and the integrity of CN IX and X. Impairment suggests lesions affecting these nerves or their nuclei in the medulla. *Incorrect: CN V & VI* - CN V (Trigeminal) provides facial sensation and motor to muscles of mastication, not involved in gag reflex - CN VI (Abducens) controls lateral rectus muscle for eye abduction *Incorrect: CN X & XI* - While CN X is involved, CN XI (Accessory nerve) innervates sternocleidomastoid and trapezius muscles, not pharyngeal muscles *Incorrect: CN VII & VIII* - CN VII (Facial) controls facial expression and taste from anterior 2/3 of tongue - CN VIII (Vestibulocochlear) is involved in hearing and balance, not the gag reflex *Incorrect: CN XI & XII* - CN XI (Accessory) innervates SCM and trapezius - CN XII (Hypoglossal) provides motor to intrinsic and extrinsic tongue muscles, not pharyngeal muscles involved in gag reflex

Q: Which tongue papillae do not have taste buds?

Filiform. ***Filiform*** - **Filiform papillae** are the most abundant type of papillae on the tongue and are responsible for the **mechanical action of gripping food**, due to their cone-shaped, abrasive structure of keratinized epithelium. - Unlike other papillae, they **lack taste buds** and thus do not play a role in taste sensation. *Fungiform* - **Fungiform papillae** are mushroom-shaped and are scattered among the filiform papillae, primarily on the tip and sides of the tongue. - These papillae **contain taste buds** on their superior surface and are involved in sensing taste stimuli. *Circumvallate* - **Circumvallate papillae** are large, dome-shaped structures arranged in a V-shape at the back of the tongue. - They are surrounded by a trench into which salivary glands empty, and their walls contain a **large number of taste buds**. *Foliate* - **Foliate papillae** are leaf-like folds located on the lateral margins of the posterior tongue. - They are **well-developed in young children** and contain taste buds, though they tend to degenerate with age. *Conical* - **Conical** is not a recognized classification of tongue papillae. While filiform papillae have a conical (cone-shaped) structure, "conical papillae" is not an anatomical term used to describe a distinct type of papilla.

Q: The nerve passing through the arrow-marked region in the provided image has been lesioned. Which of the following is the most likely clinical presentation?

Loss of sensation in the maxillary area of the face. ***Loss of sensation in the maxillary area of the face*** - The arrow points to the **foramen rotundum**, which transmits the **maxillary nerve (V2)**, a branch of the trigeminal nerve. - Lesion of the maxillary nerve (V2) leads to sensory loss in the **maxillary region of the face**, including the cheek, upper lip, upper teeth, and palate. *Loss of sensation in the jaw area* - Sensation in the jaw area, including the lower teeth and chin, is primarily supplied by the **mandibular nerve (V3)**, which exits through the foramen ovale. - A lesion at the foramen rotundum would not directly affect V3. *Loss of sensation on the scalp and nose* - Sensation to the scalp (anterior part) and nose is primarily supplied by the **ophthalmic nerve (V1)**, which exits the skull through the superior orbital fissure. - The foramen rotundum is not involved in the passage of the ophthalmic nerve. *Loss of sensation in the mucosa of nasopharynx* - While parts of the nasopharynx mucosa receive innervation from V2, this is a very specific and limited area, and the primary and most prominent sensory loss from a V2 lesion would be in the **maxillary facial region**. - Other nerves like the glossopharyngeal nerve also contribute to nasopharyngeal sensation. *Loss of motor function to muscles of facial expression* - Motor function to muscles of facial expression is supplied by the **facial nerve (CN VII)**, not the maxillary nerve (V2). - The maxillary nerve is a purely **sensory** branch of the trigeminal nerve and has no motor function. - The facial nerve exits the skull through the stylomastoid foramen, not the foramen rotundum.

Q: A patient was admitted with skull base trauma. The doctor was testing the marked structure in the pharyngeal region. Which of the following nerves was being tested?

Glossopharyngeal nerve. ***Glossopharyngeal nerve*** - The image shows a probe stimulating the posterior part of the **pharynx**, which elicits the **gag reflex**. - The afferent limb of the **gag reflex** is mediated primarily by the **glossopharyngeal nerve (CN IX)**, which detects sensation from the posterior tongue and pharynx. *Trigeminal nerve* - The **trigeminal nerve (CN V)** primarily mediates sensation from the face, teeth, and anterior two-thirds of the tongue, and motor control of the **muscles of mastication**. - It does not have a primary role in the sensation or reflex of the posterior pharyngeal wall. *Facial nerve* - The **facial nerve (CN VII)** is responsible for the **muscles of facial expression**, taste from the anterior two-thirds of the tongue, and parasympathetic innervation to several glands. - While it contributes to some aspects of swallowing, it is not the main sensory nerve for the gag reflex from the posterior pharynx. *Vagus* - The **vagus nerve (CN X)** provides the efferent limb of the gag reflex, causing pharyngeal muscle contraction. - However, the sensory input from the posterior pharynx (the afferent limb being tested by the probe) is primarily carried by the **glossopharyngeal nerve**. *Hypoglossal nerve* - The **hypoglossal nerve (CN XII)** provides motor innervation to the intrinsic and extrinsic muscles of the tongue. - While it is relevant in skull base trauma, it does not mediate sensation from the pharynx or the gag reflex being tested in the image.

Q: Which nerve is responsible for gag reflex

9th Cranial Nerve. ***9th Cranial Nerve*** - The **glossopharyngeal nerve (CN IX)** is primarily responsible for the **afferent (sensory)** limb of the gag reflex, detecting touch in the posterior pharynx. - It transmits sensory information to the **brainstem**, initiating the efferent response via the vagus nerve. - CN IX is considered the nerve "responsible for" the gag reflex as it **detects and initiates** the protective response. *10th Cranial Nerve* - The **vagus nerve (CN X)** provides the **efferent (motor)** limb of the gag reflex, causing pharyngeal muscle contraction. - While essential for the motor response, CN IX is the primary sensory trigger that initiates the reflex. - Both nerves work together, but CN IX is the **detection nerve** that starts the reflex arc. *11th Cranial Nerve* - The **spinal accessory nerve (CN XI)** primarily innervates the **sternocleidomastoid** and **trapezius muscles**, controlling head and shoulder movements. - It has no direct role in the **gag reflex**. *6th Cranial Nerve* - The **abducens nerve (CN VI)** is responsible for the **lateral rectus muscle** of the eye, controlling **abduction of the eyeball**. - It does not participate in the complex **sensory or motor pathways** of the gag reflex. *7th Cranial Nerve* - The **facial nerve (CN VII)** controls **facial expressions**, taste from the anterior two-thirds of the tongue, and some glandular secretions. - While it has some role in taste and salivation, it is not the primary nerve for the **gag reflex**.

Question 1

During a routine appendectomy in a 19-year-old man, the surgeon identifies a 5 cm blind-ended diverticulum on the antimesenteric border of the ileum, approximately 60 cm proximal to the ileocecal valve. Histological examination of the resected specimen reveals heterotopic gastric mucosa within the diverticulum wall alongside normal ileal mucosa and a well-defined muscularis propria continuous with the bowel wall. Which developmental structure failed to obliterate to produce this anomaly?

Accepted Answer

Vitelline (omphalomesenteric) duct connecting the midgut to the yolk sac

Answer

Allantois connecting the bladder to the umbilicus

Answer

Processus vaginalis of the peritoneum descending with the testis

Answer

Umbilical vein within the falciform ligament

Answer

Dorsal mesentery of the midgut during intestinal rotation at week 10

Question 2

A histology slide from a routine autopsy is shown. The image reveals a tubular structure whose wall contains an inner oblique, middle circular, and outer longitudinal smooth muscle layer. The mucosa is lined by simple columnar epithelium with prominent gastric pits, and the lamina propria contains straight tubular glands extending the full depth of the mucosa with parietal (oxyntic) cells and chief cells that open into the base of the pits. The submucosa is unremarkable. Which region of the gastrointestinal tract does this specimen most likely represent?

Accepted Answer

Fundus of the stomach

Answer

Cardiac region of the stomach

Answer

Pyloric region of the stomach

Answer

First part of the duodenum

Answer

Gastroesophageal junction

Question 3

Impaired gag reflex is seen due to a lesion in which cranial nerves?

Accepted Answer

CN IX & X

Answer

CN V&VI

Answer

CN X & XI

Answer

CN VII & VIII

Answer

CN XI & XII

Question 4

Which tongue papillae do not have taste buds?

Accepted Answer

Filiform

Answer

Fungiform

Answer

Circumvallate

Answer

Foliate

Answer

Conical

Question 5

Match the following nerves to their respective areas of supply to the auricle

Accepted Answer

A - Auriculotemporal, B - Greater auricular, C - Vagus, D - Lesser occipital

Answer

A - Greater auricular, B - Auriculotemporal, C - Lesser occipital, D - Vagus

Answer

A - Auriculotemporal, B - Lesser occipital, C - Greater auricular, D - Vagus

Answer

A - Auriculotemporal, B - Lesser occipital, C - Vagus, D - Greater auricular

Answer

A - Vagus, B - Greater auricular, C - Auriculotemporal, D - Lesser occipital

Question 6

The nerve passing through the arrow-marked region in the provided image has been lesioned. Which of the following is the most likely clinical presentation?

Accepted Answer

Loss of sensation in the maxillary area of the face

Answer

Loss of sensation in the jaw area

Answer

Loss of sensation on the scalp and nose

Answer

Loss of sensation in the mucosa of nasopharynx

Answer

Loss of motor function to muscles of facial expression

Question 7

An absent gag reflex can result from injury to which of the following nerves?

Accepted Answer

Cranial Nerve IX (Glossopharyngeal) and Cranial Nerve X (Vagus)

Answer

Cranial Nerve VII (Facial) and Cranial Nerve V (Trigeminal)

Answer

Cranial Nerve V (Trigeminal) and Cranial Nerve IX (Glossopharyngeal)

Answer

Cranial Nerve X (Vagus) and Cranial Nerve VII (Facial)

Answer

Cranial Nerve XII (Hypoglossal) and Cranial Nerve X (Vagus)

Question 8

Which of the following statements is true regarding the structure shown in the image?

Accepted Answer

Lingual nerve

Answer

Hypoglossal nerve

Answer

Nerve to mylohyoid

Answer

Inferior alveolar nerve

Answer

Glossopharyngeal nerve

Question 9

A patient was admitted with skull base trauma. The doctor was testing the marked structure in the pharyngeal region. Which of the following nerves was being tested?

Accepted Answer

Glossopharyngeal nerve

Answer

Trigeminal nerve

Answer

Facial nerve

Answer

Vagus

Answer

Hypoglossal nerve

Question 10

Which nerve is responsible for gag reflex

Accepted Answer

9th Cranial Nerve

Answer

11th cranial nerve

Answer

6th Cranial Nerve

Answer

7th Cranial Nerve

Answer

10th Cranial Nerve

Head & Neck — MCQs

Head & Neck — MCQs

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