Neck Practice Questions

Q: The superior thyroid artery originates from which of the following arteries?

External carotid artery. The **superior thyroid artery** is the first anterior branch of the **External Carotid Artery (ECA)**. It arises just below the level of the greater cornu of the hyoid bone and descends to supply the upper pole of the thyroid gland. **Why the correct answer is right:** The External Carotid Artery provides the primary arterial supply to the neck and face through eight major branches. The superior thyroid artery is typically the first branch to emerge from the ECA, often originating near its bifurcation from the Common Carotid Artery. It plays a vital role in supplying the thyroid gland and the larynx (via the superior laryngeal artery). **Why the incorrect options are wrong:** * **Internal Carotid Artery (ICA):** In the neck, the ICA has **no branches**. It enters the skull through the carotid canal to supply the brain and the eye. * **Facial Artery:** This is the third anterior branch of the ECA. While it originates from the same parent vessel, it primarily supplies the structures of the face. * **Maxillary Artery:** This is one of the two terminal branches of the ECA (the other being the superficial temporal artery). It originates within the parotid gland and supplies deep structures of the face and the meninges. **High-Yield Clinical Pearls for NEET-PG:** 1. **Surgical Anatomy:** During a thyroidectomy, the superior thyroid artery is ligated **close to the gland** to avoid injuring the **external laryngeal nerve**, which runs in close proximity to the artery. 2. **Blood Supply:** The thyroid gland has a dual supply; the inferior thyroid artery (a branch of the thyrocervical trunk from the subclavian artery) [1] supplies the lower pole. 3. **Mnemonic for ECA branches:** "**S**ome **A**ttic **L**ife **F**orce **O**nly **P**repares **M**aximum **S**trength" (Superior thyroid, Ascending pharyngeal, Lingual, Facial, Occipital, Posterior auricular, Maxillary, Superficial temporal).

Q: Which of the following statements is NOT true regarding the deep cervical lymph nodes?

They lie along the external jugular vein.. The deep cervical lymph nodes are a vital chain of nodes responsible for the ultimate lymphatic drainage of the head and neck. **Explanation of the Correct Answer (A):** The deep cervical lymph nodes are specifically arranged along the **internal jugular vein (IJV)**, not the external jugular vein [1]. They are located deep to the sternocleidomastoid muscle. In contrast, the **superficial cervical lymph nodes** are the ones that lie along the external jugular vein. Therefore, statement A is incorrect and the right answer. **Analysis of Other Options:** * **Option B:** The **jugulodigastric node** (located where the posterior belly of the digastric crosses the IJV) is the primary node for the palatine tonsils. It is often referred to as the "principal node of the tonsil." * **Option C:** These nodes are anatomically situated within the carotid sheath [1], lying **deep to the sternocleidomastoid muscle**, which serves as a protective landmark. * **Option D:** The **juguloomohyoid node** (located where the omohyoid muscle crosses the IJV) receives lymphatic drainage from the tongue, specifically the submental and submandibular nodes. It is often called the "principal node of the tongue." **High-Yield NEET-PG Pearls:** * **Leveling System:** Deep cervical nodes are classified into Levels II through IV (Upper, Middle, and Lower) [1]. * **Virchow’s Node:** A supraclavicular node (Level V) on the left side; its enlargement (Troisier’s sign) suggests occult intra-abdominal malignancy (e.g., gastric cancer). * **Drainage:** All lymphatic vessels of the head and neck eventually drain into the deep cervical nodes before entering the jugular lymph trunks.

Q: Which vein collects blood from the common facial vein?

Internal jugular vein. The **Common Facial Vein** is formed by the union of the **Anterior Facial Vein** and the **Anterior Division of the Retromandibular Vein**. It crosses the carotid sheath and its contents to drain directly into the **Internal Jugular Vein (IJV)** at the level of the greater cornua of the hyoid bone. This makes the IJV the primary collector of venous blood from the face and submandibular region. **Analysis of Options:** * **Internal Jugular Vein (Correct):** As the largest vein in the neck, it receives the common facial, lingual, and superior thyroid veins before joining the subclavian vein. * **External Jugular Vein (Incorrect):** This is formed by the union of the **Posterior Division of the Retromandibular Vein** and the **Posterior Auricular Vein**. It runs superficially over the sternocleidomastoid muscle. * **Subclavian Vein (Incorrect):** This vein receives the external jugular vein but does not directly receive the common facial vein. * **Suboccipital Venous Plexus (Incorrect):** This plexus is located in the suboccipital triangle and drains into the vertebral veins; it is unrelated to the facial venous drainage. **High-Yield Clinical Pearls for NEET-PG:** * **The "Dangerous Area of the Face":** The facial vein communicates with the **Cavernous Sinus** via the superior ophthalmic vein and the pterygoid plexus (via deep facial veins). Since facial veins lack valves, infections from the nose or upper lip can lead to **Cavernous Sinus Thrombosis**. * **Retromandibular Vein Split:** Remember the mnemonic: **P**osterior division + **P**osterior auricular = **E**xternal Jugular. **A**nterior division + **F**acial vein = **C**ommon Facial (drains to IJV).

Q: Which muscle is responsible for the change in pitch of sound?

Cricothyroid. **Explanation:** The pitch of the human voice is primarily determined by the **tension and length** of the vocal folds. **Why Cricothyroid is correct:** The **Cricothyroid muscle** is known as the "tensing muscle" of the larynx. When it contracts, it tilts the thyroid cartilage forward or pulls the cricoid cartilage upward. This action increases the distance between the thyroid and arytenoid cartilages, thereby **stretching and tensing** the vocal folds. Increased tension leads to a higher frequency of vibration, which results in a **higher pitch**. **Analysis of Incorrect Options:** * **Posterior cricoarytenoids:** These are the only **abductors** of the vocal folds (opening the glottis). Their primary role is respiratory, not pitch modulation. * **Lateral cricoarytenoids:** These are the primary **adductors** of the vocal folds, closing the glottis for phonation. * **Vocalis:** This muscle (the medial part of the thyroarytenoid) adjusts the local tension of the vocal folds. While it helps in fine-tuning the voice and "thickening" the folds to lower pitch, the primary muscle responsible for the gross change in pitch (especially high pitch) is the cricothyroid. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve Supply:** All intrinsic muscles of the larynx are supplied by the **Recurrent Laryngeal Nerve (RLN)**, EXCEPT the **Cricothyroid**, which is supplied by the **External Laryngeal Nerve**. * **Safety Muscle:** The **Posterior Cricoarytenoid** is the "safety muscle of the larynx" because it is the only muscle that opens the airway. * **Injury:** Damage to the external laryngeal nerve (often during thyroid surgery) leads to an inability to tense the vocal folds, resulting in a **hoarse voice and loss of high-pitched notes** (important for singers).

Q: What is the usual number of parathyroid glands in a human?

4. **Explanation:** The parathyroid glands are small, endocrine glands located on the posterior aspect of the thyroid gland. In approximately **80-90% of the population**, there are **four** parathyroid glands: two superior and two inferior [1], [2]. * **Superior Parathyroid Glands:** Derived from the **fourth pharyngeal pouch**. They are relatively constant in position, usually located at the level of the lower border of the cricoid cartilage. * **Inferior Parathyroid Glands:** Derived from the **third pharyngeal pouch** (along with the thymus). Because they migrate a longer distance during development, their final position is more variable [1]. **Analysis of Options:** * **Option A (4):** This is the standard anatomical number. They are organized as a superior and inferior pair on each side [2]. * **Options B, C, and D:** While numerical variations exist (some individuals may have 3, 5, or even 6 glands due to developmental remnants or division of primordia), these are considered anatomical variations. For examination purposes, "4" is the definitive "usual" number. **High-Yield NEET-PG Pearls:** 1. **Blood Supply:** All four glands are primarily supplied by the **inferior thyroid artery** (a branch of the thyrocervical trunk) [1]. This is a critical landmark during thyroid surgery. 2. **Ectopic Location:** The inferior parathyroids are more likely to be ectopic (found in the mediastinum or thymus) due to their longer migratory path from the 3rd pouch. 3. **Surgical Landmark:** The **recurrent laryngeal nerve** typically passes deep to the parathyroid glands; surgeons must identify it to avoid vocal cord paralysis [1].

Q: What is true regarding the lymphatic drainage of the neck?

Tonsils drain to the upper deep cervical nodes.. The lymphatic drainage of the head and neck is a high-yield topic for NEET-PG, centered on the concept that all lymph eventually filters through the deep cervical chain. ### **Analysis of Options** * **Correct Answer (B):** The palatine tonsils drain primarily into the **jugulodigastric node**, which is the largest node in the **upper deep cervical group**. Located where the posterior belly of the digastric crosses the internal jugular vein, it is often referred to as the "tonsillar node." * **Option A is incorrect:** The posterior third of the tongue is highly vascular and has a rich, bilateral lymphatic supply that drains directly into the **upper deep cervical nodes**. * **Option C is incorrect:** While most lymphatics eventually reach the deep cervical chain, they do not "inevitably" supply only the *lower* nodes first. Lymph from certain areas (like the tip of the tongue) may bypass upper nodes, but the statement is an overgeneralization. * **Option D is incorrect:** The anterior part of the nasal cavity and septum drains into the **submental nodes** or directly to the **submandibular nodes**, but the *posterior* part drains to the retropharyngeal or upper deep cervical nodes. ### **Clinical Pearls for NEET-PG** * **Jugulodigastric Node:** Most common site for metastatic squamous cell carcinoma from the oral cavity/oropharynx. * **Jugulo-omohyoid Node:** Associated with the **tongue**; located where the omohyoid crosses the IJV. * **Virchow’s Node (Troisier’s sign):** Left supraclavicular node enlargement, indicating occult visceral malignancy (e.g., gastric cancer) via the thoracic duct. * **Waldeyer’s Ring:** A protective ring of lymphoid tissue (pharyngeal, tubal, palatine, and lingual tonsils) at the gateway of the digestive and respiratory tracts.

Question 1

Which of the following statements are true about the sternocleidomastoid muscle?

Accepted Answer

a, b, c, and e

Answer

b, c, d, and e

Answer

a, c, d, and e

Answer

a, b, d, and e

Question 2

The superior thyroid artery originates from which of the following arteries?

Accepted Answer

External carotid artery

Answer

Internal carotid artery

Answer

Facial artery

Answer

Maxillary artery

Question 3

Which of the following statements is NOT true regarding the deep cervical lymph nodes?

Accepted Answer

They lie along the external jugular vein.

Answer

The tonsil is drained by the jugulodigastric nodes.

Answer

They lie deep to the sternocleidomastoid muscle.

Answer

The tongue drains into the juguloomohyoid nodes.

Question 4

Which vein collects blood from the common facial vein?

Accepted Answer

Internal jugular vein

Answer

External jugular vein

Answer

Subclavian vein

Answer

Suboccipital venous plexus

Question 5

Which muscle is responsible for the change in pitch of sound?

Accepted Answer

Cricothyroid

Answer

Posterior cricoarytenoids

Answer

Lateral cricoarytenoids

Answer

Vocalis

Question 6

What is the usual number of parathyroid glands in a human?

Accepted Answer

4

Answer

3

Answer

2

Answer

5

Question 7

What is the most common site of subclavian artery stenosis?

Accepted Answer

1st part

Answer

2nd part

Answer

3rd part

Answer

Terminal part

Question 8

The inferior thyroid artery arises from which of the following?

Accepted Answer

The thyrocervical trunk of the first part of the subclavian artery

Answer

The first part of the subclavian artery

Answer

The third part of the subclavian artery

Answer

The internal carotid artery

Question 9

What is true regarding the lymphatic drainage of the neck?

Accepted Answer

Tonsils drain to the upper deep cervical nodes.

Answer

Posterior tongue has no significant lymphatic supply.

Answer

Inevitably all lymphatics ultimately supply to the lower deep cervical nodes.

Answer

Anterior half of the nasal septum drains to the submandibular node.

Question 10

Which of the following statements regarding thyroidectomy is incorrect?

Accepted Answer

The recurrent laryngeal nerve supplies all intrinsic muscles of the larynx.

Answer

The recurrent laryngeal nerve is closely related to the inferior thyroid artery.

Answer

The superior laryngeal nerve supplies the cricothyroid muscle.

Answer

The inferior thyroid artery is long and tortuous.

Neck — MCQs

Neck — MCQs

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