Neck Practice Questions

Q: A patient has loss of sensation at the angle of the mandible and the parotid area. Which of the following nerves is most likely to be injured?

Greater auricular nerve. ### Explanation **1. Why the Correct Answer is Right:** The **Greater Auricular Nerve** is a branch of the **Cervical Plexus (C2, C3)**. It ascends across the sternocleidomastoid muscle to provide cutaneous innervation to the skin over the **angle of the mandible**, the **parotid gland fascia**, and both surfaces of the lower part of the auricle. This is a classic anatomical "trap" because while the mandibular nerve supplies most of the lower face, the skin over the angle of the mandible is a notable exception, being supplied by the spinal nerves (Cervical Plexus) rather than the Cranial Nerve V (Trigeminal). **2. Why the Incorrect Options are Wrong:** * **Mandibular Nerve (V3):** While it supplies the lower teeth and chin, it specifically **does not** supply the skin over the angle of the mandible. * **Auriculotemporal Nerve:** A branch of V3, it supplies the upper part of the auricle, the external auditory meatus, and the temple region. It also carries postganglionic parasympathetic fibers to the parotid gland but does not provide sensation to the skin over the angle. * **Lesser Occipital Nerve (C2):** This nerve supplies the scalp behind and above the auricle. **3. Clinical Pearls for NEET-PG:** * **The "Angle Exception":** Always remember that the skin over the angle of the mandible is the only part of the face not supplied by the Trigeminal nerve. * **Parotid Surgery:** The Greater Auricular Nerve is the most commonly injured nerve during a parotidectomy, leading to numbness in the earlobe and the area over the parotid. * **Nerve Point of the Neck (Erb’s Point):** The Greater Auricular, Lesser Occipital, Transverse Cervical, and Supraclavicular nerves all emerge from the posterior border of the sternocleidomastoid at this point.

Q: Foramen transversarium transmits all except:

Emissary vein. The **foramen transversarium** is a characteristic feature of cervical vertebrae (C1–C7), located within the transverse processes. It serves as a protective conduit for vital neurovascular structures ascending to the cranial cavity. [1] ### **Explanation of the Correct Answer** **C. Emissary vein:** This is the correct answer because emissary veins typically pass through cranial foramina (like the parietal or mastoid foramina) to connect extracranial veins with intracranial dural venous sinuses. They do not pass through the foramen transversarium. ### **Analysis of Other Options** * **A. Vertebral artery:** This is the primary structure transmitted. It enters the foramen transversarium of **C6** and ascends through C1 before entering the foramen magnum. (Note: It does *not* pass through C7). * **B. Vertebral vein:** A plexus of veins accompanies the artery. Unlike the artery, the vertebral vein passes through the foramina of **all** cervical vertebrae, including **C7**. * **D. Inferior cervical ganglion:** Sympathetic nerves (the vertebral plexus) accompany the vertebral artery through the foramina. Specifically, the inferior cervical ganglion (or the Stellate ganglion) lies in close proximity to the C7 transverse process, and its postganglionic fibers ascend through the foramina. ### **High-Yield NEET-PG Pearls** * **C7 Exception:** The foramen transversarium of C7 is the smallest. It transmits the **vertebral vein** but **NOT the vertebral artery**. * **Vertebral Artery Origin:** It is the first branch of the first part of the Subclavian artery. * **Clinical Correlation:** Osteophytes (bone spurs) in the cervical spine can compress the foramen transversarium, leading to **Vertebrobasilar Insufficiency (VBI)**, characterized by dizziness upon turning the head.

Q: Which of the following is NOT a branch of the first part of the left subclavian artery?

Costocervical trunk. The subclavian artery is divided into three parts by the **scalenus anterior muscle**. The branching pattern differs slightly between the right and left sides, which is a high-yield distinction for NEET-PG. ### **Explanation of the Correct Answer** On the **left side**, the first part of the subclavian artery gives off three branches: the **Vertebral artery**, the **Internal thoracic artery**, and the **Thyrocervical trunk**. The **Costocervical trunk** typically arises from the **second part** of the left subclavian artery (posterior to the scalenus anterior). *Note:* On the right side, the costocervical trunk usually arises from the first part, making this a classic anatomical "trap" question. ### **Analysis of Incorrect Options** * **A. Vertebral artery:** This is the first and largest branch of the first part. It ascends through the foramina transversaria of the C1–C6 vertebrae. * **B. Thyrocervical trunk:** A short, wide trunk arising from the first part, distal to the vertebral artery. It further divides into the inferior thyroid, suprascapular, and transverse cervical arteries. * **C. Internal thoracic artery:** Arises from the lower aspect of the first part, opposite the thyrocervical trunk, and descends into the thorax. ### **High-Yield Clinical Pearls** * **Mnemonic for 1st part branches:** **VIT** (**V**ertebral, **I**nternal thoracic, **T**hyrocervical trunk). * **Subclavian Steal Syndrome:** Occurs due to proximal stenosis of the subclavian artery (before the origin of the vertebral artery), leading to retrograde flow in the vertebral artery to supply the arm. * **Scalenus Anterior Relationship:** The phrenic nerve crosses the first part of the subclavian artery but lies anterior to the scalenus anterior muscle.

Q: The subcapsular plexus of lymphatics from the thyroid gland drains into which of the following anatomical levels of lymph nodes?

Level VI. ### Explanation **1. Why Level VI is Correct:** The thyroid gland is located in the anterior compartment of the neck. Its primary lymphatic drainage follows a predictable pattern: the **subcapsular plexus** of the thyroid first drains into the **Level VI (Anterior Compartment)** lymph nodes. These include the **prelaryngeal (Delphian)**, **pretracheal**, and **paratracheal** nodes. Because Level VI nodes are the closest anatomical neighbors to the thyroid, they are considered the "first-station" or sentinel nodes for thyroid malignancies (especially papillary thyroid carcinoma). **2. Why Other Options are Incorrect:** * **Level I (Submental/Submandibular):** These nodes drain the lip, oral cavity, and submandibular gland. They are not part of the primary drainage pathway for the thyroid. * **Level III (Middle Jugular):** While the thyroid can drain to the deep cervical chain (Levels II, III, and IV), this is usually secondary to Level VI drainage or occurs via lateral lymphatic channels. Level VI remains the primary immediate site. * **Level VII (Superior Mediastinal):** These nodes are located below the suprasternal notch. While thyroid cancer can extend here (especially from the lower pole), it is considered a secondary progression rather than the primary subcapsular drainage site. **3. Clinical Pearls for NEET-PG:** * **Delphian Node:** A prelaryngeal node in Level VI. If palpable, it may indicate laryngeal cancer or metastatic thyroid cancer (ominous sign). * **Skip Metastasis:** In rare cases, thyroid cancer can skip Level VI and present directly in Level II or III; however, Level VI remains the standard answer for primary drainage. * **Surgical Note:** A "Central Neck Dissection" specifically refers to the removal of Level VI lymph nodes. * **Most Common Site of Metastasis:** For Papillary Carcinoma of the Thyroid, Level VI is the most common site of nodal involvement.

Q: Which part of the vertebral column contains the foramen transversarium?

Cervical vertebra. The **foramen transversarium** is the defining characteristic of **cervical vertebrae**. It is an opening located within the transverse process of all seven cervical vertebrae. **Why the correct answer is right:** The primary function of the foramen transversarium is to provide a protected conduit for the **vertebral artery**, vertebral veins, and sympathetic nerves. Specifically, the vertebral artery enters the foramen at the level of C6 and ascends through C1 before entering the cranium via the foramen magnum. Note that while C7 has a foramen transversarium, it typically only transmits small accessory vertebral veins, not the vertebral artery. **Why the incorrect options are wrong:** * **Options A, B, and C (Cranial Fossae):** These are regions of the internal base of the skull. While they contain numerous important foramina (such as the foramen rotundum in the middle fossa or foramen magnum in the posterior fossa), the foramen transversarium is strictly an anatomical feature of the vertebral column, not the skull base. **High-Yield Clinical Pearls for NEET-PG:** * **Vertebral Artery Path:** It originates from the first part of the subclavian artery and enters the C6 transverse foramen. * **Atypical Cervical Vertebrae:** C1 (Atlas), C2 (Axis), and C7 (Vertebra Prominens) have unique features, but all possess the foramen transversarium. * **Clinical Correlation:** Osteophytic growths or subluxation of cervical vertebrae can compress the vertebral artery within these foramina, leading to **Vertebrobasilar Insufficiency (VBI)**, characterized by dizziness or syncope upon neck rotation.

Q: Which of the following muscles forms the floor of the digastric triangle?

Mylohyoid. ### Explanation The **Digastric Triangle** (also known as the submandibular triangle) is a key anatomical region in the neck. To identify its floor, one must visualize the muscles lying deep to the submandibular gland. **1. Why Mylohyoid is Correct:** The floor of the digastric triangle is formed by two muscles: the **mylohyoid** anteriorly and the **hyoglossus** posteriorly. The mylohyoid muscle acts as a structural diaphragm for the mouth, extending from the mylohyoid line of the mandible to the hyoid bone. Since the digastric triangle is located just below the body of the mandible, the mylohyoid naturally forms its primary floor. **2. Why the Other Options are Incorrect:** * **Geniohyoid:** This muscle lies **superior** (deep) to the mylohyoid. It is located within the floor of the mouth proper, not the floor of the digastric triangle. * **Stylohyoid:** This muscle forms part of the **posterior boundary** of the triangle (along with the posterior belly of the digastric), rather than the floor. * **Sternohyoid:** This is an infrahyoid "strap muscle" located in the **muscular triangle** of the neck, well below the level of the digastric triangle. **3. High-Yield Facts for NEET-PG:** * **Boundaries:** Superiorly by the base of the mandible; Anteroinferiorly by the anterior belly of digastric; Posteroinferiorly by the posterior belly of digastric. * **Contents:** The most important content is the **submandibular salivary gland**, the facial artery/vein, and the **hypoglossal nerve (CN XII)**. * **Nerve Supply:** Remember the "Rule of Two Bellies"—the anterior belly of digastric (and mylohyoid) is supplied by the **Nerve to Mylohyoid (V3)**, while the posterior belly (and stylohyoid) is supplied by the **Facial Nerve (CN VII)**.

Q: Which of the following statements is true regarding the longus colli muscle?

Its nerve supply is from spinal nerves C2-C6.. The **Longus colli** is a deep prevertebral muscle of the neck, essential for stabilizing and moving the cervical spine. ### **Explanation of the Correct Option** **C. Nerve supply is from spinal nerves C2-C6:** The longus colli is supplied by the **anterior rami of the C2 to C6 spinal nerves**. This is a high-yield fact for NEET-PG, as prevertebral muscles are generally supplied by the ventral rami of the cervical nerves corresponding to their level of origin [1]. ### **Analysis of Incorrect Options** * **A. Origin is in the occiput:** This is incorrect. The longus colli does **not** reach the skull (occiput). It spans from the atlas (C1) down to the T3 vertebra [1]. Muscles that attach to the occiput include the *Longus capitis* and *Rectus capitis* group. * **B. Extensor of the neck:** This is incorrect. Located on the anterior aspect of the vertebral column, the longus colli acts as a **flexor** of the neck. It also assists in lateral flexion and rotation to the opposite side. * **D. Inserts on C3-C6:** While parts of the muscle involve these levels, this is an incomplete description of its complex structure. It consists of three parts (superior oblique, inferior oblique, and vertical), extending from the **anterior tubercle of C1 (atlas) to the body of T3** [1]. ### **High-Yield Clinical Pearls for NEET-PG** * **Prevertebral Fascia:** The longus colli lies deep to the prevertebral layer of the deep cervical fascia. * **Retropharyngeal Abscess:** Infections in the retropharyngeal space (located between the buccopharyngeal fascia and prevertebral fascia) can track down to the superior mediastinum, limited posteriorly by the longus colli. * **Sympathetic Chain:** The cervical sympathetic trunk lies directly on the longus colli muscle, medial to the carotid sheath.

Q: In which part of the esophagus do foreign bodies most commonly lodge?

The cricopharyngeus muscle. The esophagus has four physiological constrictions where the lumen is naturally narrowed. These sites are the most common locations for foreign bodies to lodge, with the **cricopharyngeus muscle** being the most frequent. ### 1. Why the Cricopharyngeus is Correct The cricopharyngeus muscle (at the level of **C6**) forms the **upper esophageal sphincter (UES)**. This is the narrowest point of the entire esophagus (approximately 1.5 cm in diameter). Because it is the first and tightest bottleneck, most swallowed foreign bodies (coins, fish bones, boluses) fail to pass this point and become impacted here. ### 2. Analysis of Incorrect Options * **A. The thoracic inlet:** While the esophagus is slightly narrowed here (level of T2), it is wider than the cricopharyngeal opening. * **C. The level of the aortic arch:** This is the second anatomical constriction (level of T4), caused by the arch of the aorta crossing the esophagus. It is a common site for secondary impaction but less frequent than the UES. * **D. The level of the left main bronchus:** This is the third constriction (level of T5/T6). While clinically relevant, it is rarely the primary site of obstruction compared to the UES. ### 3. High-Yield Clinical Pearls for NEET-PG * **The Four Constrictions:** 1. **6 inches (15cm)** from incisors: Cricopharyngeus (Narrowest). 2. **9 inches (22cm)** from incisors: Aortic arch. 3. **11 inches (27cm)** from incisors: Left main bronchus. 4. **15 inches (40cm)** from incisors: Diaphragmatic hiatus (Lower esophageal sphincter). * **Radiology Tip:** On a PA/AP X-ray, a coin lodged in the esophagus appears as a **circular disk** (coronal plane), whereas a coin in the trachea appears as a **vertical line** (sagittal plane). * **Most common site for perforation:** Also the cricopharyngeus (specifically Killian’s dehiscence).

Question 1

A patient has loss of sensation at the angle of the mandible and the parotid area. Which of the following nerves is most likely to be injured?

Accepted Answer

Greater auricular nerve

Answer

Mandibular nerve

Answer

Auriculotemporal nerve

Answer

Lesser occipital nerve

Question 2

The anterior triangle occupies the side of the neck in front of the sternomastoid muscle. What structure forms its anterior boundary?

Accepted Answer

Anterior median line of the neck extending from symphysis menti to suprasternal notch

Answer

The midline of the neck

Answer

Midline of the neck up to the sternoclavicular joint

Answer

Posterior border of the thyroid gland

Question 3

Chassaignac's tubercle is located at the level of which anatomical landmark?

Accepted Answer

Erb's point

Answer

Stellate ganglion

Answer

Atlas

Answer

Odontoid process

Question 4

Foramen transversarium transmits all except:

Accepted Answer

Emissary vein

Answer

Vertebral artery

Answer

Vertebral vein

Answer

Inferior cervical ganglion

Question 5

Which of the following is NOT a branch of the first part of the left subclavian artery?

Accepted Answer

Costocervical trunk

Answer

Vertebral artery

Answer

Thyrocervical trunk

Answer

Internal thoracic artery

Question 6

The subcapsular plexus of lymphatics from the thyroid gland drains into which of the following anatomical levels of lymph nodes?

Accepted Answer

Level VI

Answer

Level I

Answer

Level III

Answer

Level VII

Question 7

Which part of the vertebral column contains the foramen transversarium?

Accepted Answer

Cervical vertebra

Answer

Anterior cranial fossa

Answer

Middle cranial fossa

Answer

Posterior cranial fossa

Question 8

Which of the following muscles forms the floor of the digastric triangle?

Accepted Answer

Mylohyoid

Answer

Geniohyoid

Answer

Stylohyoid

Answer

Sternohyoid

Question 9

Which of the following statements is true regarding the longus colli muscle?

Accepted Answer

Its nerve supply is from spinal nerves C2-C6.

Answer

Its origin is in the occiput.

Answer

It is an extensor of the neck.

Answer

It inserts on cervical vertebrae C3-C6.

Question 10

In which part of the esophagus do foreign bodies most commonly lodge?

Accepted Answer

The cricopharyngeus muscle

Answer

The thoracic inlet

Answer

The level of the aortic arch

Answer

The level of the left main bronchus

Neck — MCQs

Neck — MCQs

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