Neck Practice Questions

Q: Level V lymph nodes include:

Posterior triangular lymph nodes. The cervical lymph node classification (Memorial Sloan-Kettering Cancer Center system) divides the neck into six levels. This is a high-yield topic for NEET-PG. ### **Explanation of the Correct Answer** **Level V** nodes are located within the **posterior triangle** of the neck. This region is anatomically bounded anteriorly by the posterior border of the sternocleidomastoid (SCM) muscle, posteriorly by the anterior border of the trapezius muscle, and inferiorly by the clavicle. It includes the spinal accessory nodes, transverse cervical nodes, and supraclavicular nodes. ### **Analysis of Incorrect Options** * **Option A (Pretracheal/Prelaryngeal):** These belong to **Level VI** (Anterior Compartment nodes) [1]. Level VI extends from the hyoid bone superiorly to the suprasternal notch inferiorly [3]. * **Option B (Mediastinal):** These are classified as **Level VII** nodes, located below the suprasternal notch [2]. * **Option C (Lower jugular):** These are **Level IV** nodes. The deep cervical chain (internal jugular nodes) is divided into Level II (Upper), Level III (Middle), and Level IV (Lower), based on their relationship to the hyoid bone and cricoid cartilage [3]. ### **High-Yield Clinical Pearls for NEET-PG** * **Level I:** Submental (Ia) and Submandibular (Ib) nodes. * **Level II, III, IV:** Related to the Internal Jugular Vein. The landmark dividing Level II/III is the **hyoid bone**, and Level III/IV is the **cricoid cartilage** [3]. * **Boundary of Level V:** The posterior border of the SCM is the key landmark. * **Virchow’s Node:** A specific node in the left supraclavicular fossa (part of Level V) that, when enlarged (Troisier’s sign), suggests metastatic abdominal malignancy (e.g., gastric cancer).

Q: What nerve supplies the geniohyoid muscle?

Geniohyoid. The **Geniohyoid** muscle is a suprahyoid muscle located superior to the mylohyoid. Its nerve supply is a high-yield topic because it is an anatomical exception. **Correct Answer: Geniohyoid (Nerve to Geniohyoid)** The geniohyoid is supplied by the **C1 spinal nerve fibers** via the **Hypoglossal nerve (CN XII)**. Although the nerve fibers travel physically with the hypoglossal nerve, they originate from the C1 ventral ramus. This is a unique arrangement shared only with the thyrohyoid muscle. **Analysis of Incorrect Options:** * **Anterior belly of digastric:** This muscle is derived from the first pharyngeal arch and is supplied by the **nerve to mylohyoid** (a branch of the mandibular nerve, V3). * **Posterior belly of digastric:** Derived from the second pharyngeal arch, it is supplied by the **facial nerve (CN VII)**. * **Stapedius:** This is the smallest skeletal muscle in the body, also derived from the second arch and supplied by the **facial nerve (CN VII)**. **High-Yield Clinical Pearls for NEET-PG:** * **C1 via CN XII Rule:** Remember the mnemonic "Two muscles are supplied by C1 via the Hypoglossal nerve: **Geniohyoid** and **Thyrohyoid**." * **Action:** The geniohyoid elevates the hyoid bone and carries it forward; it also helps depress the mandible when the hyoid is fixed. * **Mylohyoid vs. Geniohyoid:** The mylohyoid forms the anatomical floor of the mouth, while the geniohyoid lies immediately superior (deeper) to it. The mylohyoid is supplied by V3, whereas the geniohyoid is supplied by C1.

Q: All of the following are anterior branches of the external carotid artery except?

Ascending pharyngeal. ### Explanation The **External Carotid Artery (ECA)** is one of the two terminal branches of the common carotid artery. It provides the primary arterial supply to the structures of the neck, face, and scalp. To master this topic for NEET-PG, it is essential to categorize its eight branches based on their anatomical origin. **Why Ascending Pharyngeal is the correct answer:** The **Ascending Pharyngeal artery** is the smallest branch of the ECA. It arises from the **medial (deep) aspect** of the artery, not the anterior aspect. It ascends between the internal carotid artery and the pharynx to supply the pharyngeal wall, middle ear, and meninges. **Analysis of Incorrect Options (Anterior Branches):** The ECA gives off three distinct **anterior branches**: * **A. Superior Thyroid Artery:** The first branch of the ECA, arising near the level of the greater cornua of the hyoid bone. * **B. Lingual Artery:** Arises at the level of the hyoid bone; it is the primary supply to the tongue. * **C. Facial Artery:** Arises just above the lingual artery, often passing deep to the submandibular gland. **High-Yield Classification of ECA Branches:** To remember the branches, use the mnemonic: *"**S**ome **A**natomists **L**ike **F**reaking **O**ut **P**oor **M**edical **S**tudents"* 1. **Anterior:** Superior thyroid, Lingual, Facial. 2. **Posterior:** Occipital, Posterior auricular. 3. **Medial:** Ascending pharyngeal. 4. **Terminal:** Maxillary, Superficial temporal. **Clinical Pearls for NEET-PG:** * **Surgical Landmark:** The ECA is distinguished from the Internal Carotid Artery (ICA) in the neck because the **ECA has branches in the neck**, whereas the ICA has none. * **Ligation:** During surgery, the ECA is ligated distal to the superior thyroid artery to maintain collateral circulation to the thyroid gland.

Q: The thyrocervical trunk is a branch of which part of the subclavian artery?

1st part. The subclavian artery is divided into three parts by the **scalenus anterior muscle**: the first part is medial to the muscle, the second part is posterior (behind) it, and the third part is lateral to it. **1. Why the Correct Answer is Right (1st Part):** The first part of the subclavian artery gives off three major branches, often remembered by the mnemonic **VIT**: * **V:** Vertebral artery * **I:** Internal thoracic artery (Internal mammary) * **T: Thyrocervical trunk** The thyrocervical trunk is a short, wide vessel that further divides into the inferior thyroid, suprascapular, and transverse cervical arteries. **2. Why Incorrect Options are Wrong:** * **2nd Part:** This part typically gives off only one branch: the **costocervical trunk** (which divides into the superior intercostal and deep cervical arteries). *Note: On the left side, the costocervical trunk occasionally arises from the 1st part.* * **3rd Part:** This part is usually branchless, but it may occasionally give rise to the **dorsal scapular artery** (if it does not arise from the transverse cervical artery). **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Inferior Thyroid Artery:** A branch of the thyrocervical trunk, it is closely related to the **recurrent laryngeal nerve**. During thyroidectomy, this artery is ligated far from the gland to avoid nerve injury [1]. * **Steal Syndrome:** Obstruction of the subclavian artery proximal to the origin of the vertebral artery (1st part) can lead to Subclavian Steal Syndrome. * **Surface Anatomy:** The subclavian artery becomes the axillary artery at the outer border of the first rib.

Q: A 46-year-old woman presents with a large mass in her lower anterior neck. Ultrasound reveals a benign thyroid tumor. During surgical removal, the superior thyroid artery is identified and used as a landmark to avoid damaging its small companion nerve. Which of the following nerves is most likely to accompany the superior thyroid artery?

External branch of the superior laryngeal nerve. ### Explanation The correct answer is **B. External branch of the superior laryngeal nerve.** **1. Why it is correct:** The **superior thyroid artery (STA)**, a branch of the external carotid artery, descends to the upper pole of the thyroid gland [2]. It is closely accompanied by the **external branch of the superior laryngeal nerve (EBSLN)** [2]. Crucially, as they approach the gland, the nerve lies medial to the artery [2]. To avoid damaging this nerve during a thyroidectomy, surgeons must ligate the superior thyroid artery as **close to the gland** as possible [2]. Damage to the EBSLN results in paralysis of the **cricothyroid muscle**, leading to an inability to tense the vocal cords, manifested clinically as a loss of high-pitched voice and easy vocal fatigue. **2. Why the other options are incorrect:** * **A. Cervical sympathetic trunk:** This lies posterior to the carotid sheath, resting on the prevertebral fascia. It is not a direct companion to the STA. * **C. Inferior root of the ansa cervicalis:** This is formed by fibers from C2 and C3 and is located superficial to or within the carotid sheath, supplying the infrahyoid (strap) muscles. * **D. Internal branch of the superior laryngeal nerve:** This nerve is purely sensory. It accompanies the **superior laryngeal artery** (a branch of the STA) to pierce the thyrohyoid membrane, but it does not descend to the thyroid pole with the main STA. **3. NEET-PG High-Yield Pearls:** * **Superior Thyroid Artery:** Ligate **near** the gland to save the External Laryngeal Nerve [2]. * **Inferior Thyroid Artery:** Ligate **away** from the gland to save the Recurrent Laryngeal Nerve (RLN) [1], [3]. * **Nerve Injury Effects:** * **EBSLN:** Loss of high pitch (the "Amelita Galli-Curci" nerve). * **Unilateral RLN:** Hoarseness of voice. * **Bilateral RLN:** Respiratory distress/stridor (emergency) [3].

Q: The ligament of Berry is formed by which anatomical structure?

Pretracheal layer. The **Ligament of Berry** (also known as the posterior suspensory ligament of the thyroid) is a condensation of the **Pretracheal layer** of the deep cervical fascia. It connects the posteromedial aspect of the thyroid gland’s lobes to the cricoid cartilage and the first two tracheal rings [1]. This attachment is clinically significant as it causes the thyroid gland to move upward during deglutition (swallowing). **Analysis of Options:** * **Option B (Correct):** The pretracheal fascia splits to enclose the thyroid gland. Its thickened posterior part forms the Ligament of Berry, anchoring the gland to the larynx and trachea [1]. * **Option A:** The **Investing layer** surrounds the entire neck and encloses the trapezius and sternocleidomastoid muscles, but it does not form the suspensory ligaments of the thyroid. * **Option C:** The **Prevertebral layer** covers the prevertebral muscles and forms the floor of the posterior triangle; it is located posterior to the retropharyngeal space. * **Option D:** The **Pharyngobasilar fascia** is a fibrous membrane between the muscular and mucous coats of the pharyngeal wall, attaching the pharynx to the base of the skull. **High-Yield Clinical Pearls for NEET-PG:** 1. **Recurrent Laryngeal Nerve (RLN):** The RLN usually passes deep (posterior) to the Ligament of Berry or through its fibers [1]. This makes the nerve highly vulnerable to injury during thyroidectomy when the ligament is being divided [1]. 2. **Thyroid Mobility:** Because the ligament attaches the gland to the respiratory skeleton, any mass within the thyroid (goiter/adenoma) will move superiorly during swallowing—a key diagnostic sign. 3. **Berry’s Ligament vs. Thyroid Capsule:** The ligament is a part of the *false capsule* (pretracheal fascia), not the true fibrous capsule of the gland.

Q: What forms the posterior boundary of the carotid triangle?

Sternocleidomastoid. ### Explanation The **carotid triangle** is a highly significant anatomical space within the anterior triangle of the neck, containing major neurovascular structures. Its boundaries are defined by muscular landmarks: * **Posterior Boundary:** The **anterior border of the Sternocleidomastoid (SCM)**. This muscle serves as the primary landmark separating the anterior and posterior triangles of the neck. * **Anterosuperior Boundary:** The posterior belly of the digastric muscle. * **Anteroinferior Boundary:** The superior belly of the omohyoid muscle. * **Floor:** Formed by the thyrohyoid, hyoglossus, and the inferior and middle constrictor muscles of the pharynx. #### Analysis of Incorrect Options: * **A. Superior belly of omohyoid:** This forms the **anteroinferior** boundary of the carotid triangle. * **B. Posterior belly of digastric:** This forms the **anterosuperior** boundary. * **C. Sternohyoid:** This muscle is located more medially and forms part of the boundaries for the muscular triangle, not the carotid triangle. #### NEET-PG High-Yield Pearls: 1. **Contents:** The carotid triangle is famous for the **Carotid Sheath**, which contains the Common Carotid Artery (and its bifurcation), the Internal Jugular Vein, and the Vagus Nerve (CN X). 2. **Carotid Bifurcation:** Usually occurs at the level of the upper border of the thyroid cartilage (**C4 level**) within this triangle. 3. **Hypoglossal Nerve (CN XII):** Crosses both the internal and external carotid arteries superficially within this triangle. 4. **Ansa Cervicalis:** The superior root (descendens hypoglossi) is often found embedded in the anterior wall of the carotid sheath here.

Question 1

A patient presents with a history of swelling in the submandibular region and is diagnosed with a submandibular abscess. The incision to drain the abscess is placed 1 cm below the base of the mandible. What is the reason for this placement?

Accepted Answer

The marginal mandibular nerve can be injured if the incision is made along the base of the mandible.

Answer

The submandibular gland is located 1 cm below the mandible.

Answer

It is difficult to incise directly along the margin of the mandible.

Answer

To avoid injury to the cervical branch of the facial nerve.

Question 2

Level V lymph nodes include:

Accepted Answer

Posterior triangular lymph nodes

Answer

Pretracheal and prelaryngeal lymph nodes

Answer

Mediastinal lymph nodes

Answer

Lower jugular lymph nodes

Question 3

What nerve supplies the geniohyoid muscle?

Accepted Answer

Geniohyoid

Answer

Anterior belly of digastric

Answer

Posterior belly of digastric

Answer

Stapedius

Question 4

All of the following are anterior branches of the external carotid artery except?

Accepted Answer

Ascending pharyngeal

Answer

Superior thyroid

Answer

Lingual

Answer

Facial

Question 5

The thyrocervical trunk is a branch of which part of the subclavian artery?

Accepted Answer

1st part

Answer

2nd part

Answer

3rd part

Answer

None of the above

Question 6

A 46-year-old woman presents with a large mass in her lower anterior neck. Ultrasound reveals a benign thyroid tumor. During surgical removal, the superior thyroid artery is identified and used as a landmark to avoid damaging its small companion nerve. Which of the following nerves is most likely to accompany the superior thyroid artery?

Accepted Answer

External branch of the superior laryngeal nerve

Answer

Cervical sympathetic trunk

Answer

Inferior root of the ansa cervicalis

Answer

Internal branch of the superior laryngeal nerve

Question 7

What is true regarding Chassaignac's tubercle?

Accepted Answer

It is the anterior tubercle of the transverse process of the C6 vertebra.

Answer

It is a landmark of the otic ganglion.

Answer

It is seen in the occipital region of the skull.

Answer

All the above.

Question 8

The ligament of Berry is formed by which anatomical structure?

Accepted Answer

Pretracheal layer

Answer

Investing layer of the Deep Cervical fascia

Answer

Prevertebral layer

Answer

Pharyngobasilar fascia

Question 9

Which of the following joints is involved in the side-to-side movement of the neck?

Accepted Answer

Atlanto-axial joint

Answer

Atlanto-occipital joint

Answer

Occipital-axial joint

Answer

C6-C7 articulation

Question 10

What forms the posterior boundary of the carotid triangle?

Accepted Answer

Sternocleidomastoid

Answer

Superior belly of omohyoid

Answer

Posterior belly of digastric

Answer

Sternohyoid

Neck — MCQs

Neck — MCQs

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