Neck Practice Questions

Q: Which muscle is supplied by the spinal accessory nerve?

Trapezius. **Explanation:** The **Spinal Accessory Nerve (CN XI)** is a purely motor nerve that provides somatic motor innervation to two major muscles: the **Trapezius** and the **Sternocleidomastoid (SCM)**. It originates from the upper five or six cervical segments of the spinal cord, enters the cranium via the foramen magnum, and exits through the **jugular foramen**. In the neck, it crosses the posterior triangle to reach the deep surface of the trapezius. **Analysis of Options:** * **Trapezius (Correct):** It is supplied by the spinal accessory nerve (motor) and branches from the C3 and C4 spinal nerves (proprioception). * **Rhomboids major:** Supplied by the **Dorsal Scapular Nerve** (C5), which arises from the roots of the brachial plexus. * **Levator Scapulae:** Supplied by the **Dorsal Scapular Nerve** (C5) and direct branches from the **C3 and C4** cervical nerves. * **Subclavius:** Supplied by the **Nerve to Subclavius** (C5, C6), which arises from the upper trunk of the brachial plexus. **High-Yield Clinical Pearls for NEET-PG:** * **Iatrogenic Injury:** The spinal accessory nerve is the most commonly injured nerve during surgeries in the **posterior triangle of the neck** (e.g., lymph node biopsy). * **Clinical Presentation:** Injury leads to "drooping of the shoulder" and an inability to shrug (due to trapezius paralysis) and difficulty rotating the head to the opposite side (due to SCM paralysis). * **Surface Anatomy:** The nerve enters the trapezius approximately 2 cm above the clavicle. * **Testing:** Trapezius is tested by shrugging shoulders against resistance; SCM is tested by turning the chin to the opposite side against resistance.

Q: A patient in the emergency room has been stabbed in the back of the neck and complains that he is unable to lift his shoulder. Which of the following nerves has likely been damaged?

Accessory Nerve. ### Explanation **Correct Option: C. Accessory Nerve (CN XI)** The **Spinal Accessory Nerve** provides motor innervation to the **Trapezius** and Sternocleidomastoid muscles. After exiting the skull and supplying the Sternocleidomastoid, it crosses the **posterior triangle of the neck**, where it is superficial and highly vulnerable to penetrating injuries (like a stab wound). The Trapezius is the primary muscle responsible for **shrugging the shoulder** and rotating the scapula during abduction above 90 degrees. Damage to CN XI leads to "drooping" of the shoulder and an inability to lift/shrug it. **Analysis of Incorrect Options:** * **A. Suprascapular Nerve:** Arises from the upper trunk of the brachial plexus (C5, C6). It innervates the Supraspinatus (initiates abduction) and Infraspinatus. While it affects shoulder movement, it does not mediate the "shrugging" action. * **B. Dorsal Scapular Nerve:** Innervates the Rhomboids and Levator Scapulae. While it helps elevate the medial border of the scapula, it is located deeper and is not the primary nerve tested by the "shoulder shrug" clinical exam. * **D. Thoracodorsal Nerve:** Innervates the Latissimus Dorsi. Damage results in weakness in adduction, extension, and internal rotation of the arm (the "climbing" muscle), not an inability to lift the shoulder. **NEET-PG High-Yield Pearls:** * **Surface Anatomy:** The Accessory nerve enters the posterior triangle at the junction of the upper 1/3rd and middle 1/3rd of the Sternocleidomastoid muscle. * **Clinical Sign:** Injury results in a **"Winged Scapula"** that is more pronounced when the arm is abducted (unlike Long Thoracic Nerve injury, where winging is prominent when pushing against a wall). * **Iatrogenic Injury:** The most common cause of Accessory nerve palsy is lymph node biopsy in the posterior triangle of the neck.

Q: Which is the most common muscle affected by fibrosis?

Sternocleidomastoid. **Explanation:** The **Sternocleidomastoid (SCM)** is the most common muscle to undergo localized fibrosis, leading to a clinical condition known as **Congenital Muscular Torticollis (Wry Neck)**. **Why SCM is the Correct Answer:** The fibrosis typically occurs due to birth trauma (e.g., breech delivery) or intrauterine malpositioning, which causes localized ischemia or a hematoma within the muscle fibers [1]. This hematoma is replaced by fibrous tissue, causing the muscle to shorten and contract. Clinically, this presents as the infant’s head tilting toward the affected side and the chin rotating toward the opposite shoulder. A "sternomastoid tumor" (a palpable non-tender mass) may be felt in the muscle during the first few weeks of life. **Analysis of Incorrect Options:** * **Serratus anterior:** While prone to paralysis due to Long Thoracic Nerve injury (leading to "winging of scapula"), it does not typically undergo primary idiopathic fibrosis. * **Trapezius:** Often involved in tension headaches or accessory nerve palsy, but localized fibrosis is rare compared to the SCM. * **Tendocalcaneous (Achilles Tendon):** This is a tendon, not a muscle. While it can undergo xanthomas or rupture, it is not the primary site for the specific fibrotic process described in classical anatomical pathology. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve Supply:** SCM is supplied by the **Spinal Accessory Nerve (CN XI)** for motor function and **C2, C3** for proprioception. * **Torticollis Treatment:** Initial management is conservative (stretching); refractory cases may require surgical release of the SCM heads [1]. * **Relations:** The External Jugular Vein crosses the SCM superficially, and the Carotid Sheath lies deep to it.

Q: The isthmus of the thyroid gland is located across which tracheal rings?

2nd to 4th. ### Explanation **1. Why Option A is Correct:** The thyroid gland consists of two lateral lobes connected by a central bridge called the **isthmus**. In a standard anatomical position, the isthmus lies horizontally across the **2nd, 3rd, and 4th tracheal rings**. This is a high-yield anatomical landmark used by surgeons and clinicians to localize the gland and its relationship to the airway. **2. Analysis of Incorrect Options:** * **Option B (3rd to 5th):** This is too low. While anatomical variations exist, the standard description in textbooks consistently places the superior border at the 2nd ring. * **Option C (5th and 6th):** These rings are located much lower in the neck, closer to the suprasternal notch. Placing the isthmus here would imply an ectopic or low-lying thyroid. * **Option D (4th only):** While the isthmus covers the 4th ring, it is not limited to it. It typically spans three rings in total. **3. Clinical Pearls for NEET-PG:** * **Tracheostomy Site:** A standard tracheostomy is usually performed at the level of the **2nd and 3rd or 3rd and 4th tracheal rings**. Because the isthmus covers this exact area, it often needs to be retracted superiorly or divided during the procedure to gain access to the trachea. * **Pyramidal Lobe:** In about 40-50% of individuals, a small "pyramidal lobe" extends upwards from the isthmus (usually the left side), representing a remnant of the **thyroglossal duct** [1]. * **Levator Glandulae Thyroideae:** This is a fibromuscular band that sometimes connects the isthmus or pyramidal lobe to the hyoid bone. * **Vertebral Level:** The thyroid gland as a whole extends from the **C5 to T1** vertebral levels.

Q: The first part of the vertebral artery is related to which of the following structures?

Stellate ganglion. The vertebral artery is divided into four parts. The **first part (pre-foraminal)** extends from its origin at the subclavian artery to its entry into the foramen transversarium of the C6 vertebra. ### Why Stellate Ganglion is Correct The first part of the vertebral artery ascends in the **"Scalenovertebral Triangle"** (Triangle of Vertebral Artery). Within this space, the artery lies directly anterior to the **Stellate ganglion** (the fusion of the inferior cervical and first thoracic sympathetic ganglia). The ganglion sits on the neck of the first rib, and the vertebral artery passes just in front of it before entering the C6 transverse foramen. ### Why Other Options are Incorrect * **Superior Cervical Ganglion:** Located much higher in the neck, at the level of C2 and C3 vertebrae, posterior to the internal carotid artery. * **Middle Cervical Ganglion:** Usually located at the level of the C6 vertebra, near the inferior thyroid artery, but it lies medial or anterior to the vertebral artery, not in the direct posterior relation characteristic of the first part. * **Ciliary Ganglion:** An ocular parasympathetic ganglion located in the posterior orbit; it has no anatomical relation to the neck or the vertebral artery. ### High-Yield NEET-PG Pearls * **Triangle of Vertebral Artery:** Boundaries are Medial (Longus colli), Lateral (Scalenus anterior), and Apex (Transverse process of C6). * **Course:** The vertebral artery enters the transverse foramen of **C6**, NOT C7. * **Clinical Significance:** Compression of the stellate ganglion (e.g., by a Pancoast tumor or during procedures near the vertebral artery) leads to **Horner’s Syndrome** (miosis, ptosis, anhidrosis).

Q: Which of the following is NOT a branch of the external carotid artery?

Inferior thyroid artery. The external carotid artery (ECA) is one of the two terminal branches of the common carotid artery, providing the primary blood supply to the exterior of the head, face, and neck. ### **Explanation of the Correct Answer** **A. Inferior thyroid artery:** This is the correct answer because it is **not** a branch of the external carotid artery. Instead, it arises from the **thyrocervical trunk**, which is a branch of the first part of the **subclavian artery**. This is a high-yield distinction in anatomy exams. ### **Analysis of Incorrect Options** * **B. Facial artery:** This is the third anterior branch of the ECA. It arises in the carotid triangle and supplies the structures of the face. * **C. Superior thyroid artery:** This is the **first** anterior branch of the ECA. It descends to supply the upper pole of the thyroid gland. * **D. Maxillary artery:** This is one of the two **terminal branches** of the ECA (the other being the superficial temporal artery). It arises within the parotid gland. ### **High-Yield Clinical Pearls for NEET-PG** * **Mnemonic for ECA branches:** "**S**ome **A**natomists **L**ike **F**reaking **O**ut **P**oor **M**edical **S**tudents" (Superior thyroid, Ascending pharyngeal, Lingual, facial, Occipital, Posterior auricular, Maxillary, Superficial temporal). * **Surgical Landmark:** During thyroidectomy, the **Superior Thyroid Artery** is closely related to the **external laryngeal nerve**, while the **inferior thyroid artery** is related to the **recurrent laryngeal nerve** [1]. * **Carotid Triangle:** The ECA begins at the level of the upper border of the thyroid cartilage (C4 level).

Q: What structure is related to the upper border of the posterior belly of the digastric muscle?

Posterior auricular artery.. **Explanation:** The **posterior belly of the digastric muscle** is a key landmark in the neck. Understanding its vascular and neural relations is high-yield for NEET-PG. **1. Why Posterior Auricular Artery is Correct:** The **posterior auricular artery** arises from the external carotid artery just above the upper border of the posterior belly of the digastric. It then tracks upwards and backwards, following the **upper border** of this muscle toward the interval between the mastoid process and the external auditory meatus. **2. Analysis of Incorrect Options:** * **Occipital Artery:** This artery arises at the same level as the facial artery but runs along the **lower border** of the posterior belly of the digastric. It eventually crosses the internal carotid artery and internal jugular vein. * **Ascending Pharyngeal Artery:** This is the first branch of the external carotid artery, arising deep and medial to the external carotid. It ascends vertically between the internal carotid and the pharynx, not specifically related to the digastric borders. * **Lingual Artery:** This artery arises at the level of the greater cornua of the hyoid bone. It is related to the **middle constrictor** and the **hyoglossus** muscle, passing deep to the latter. **3. NEET-PG High-Yield Pearls:** * **Structures passing deep to the muscle:** Internal carotid artery, internal jugular vein, and the 10th, 11th, and 12th cranial nerves. * **Nerve Supply:** The posterior belly is supplied by the **Facial nerve (CN VII)**, while the anterior belly is supplied by the **Nerve to Mylohyoid (CN V3)**. * **The "Sandwich" Rule:** The occipital artery is related to the *lower* border; the posterior auricular artery is related to the *upper* border.

Question 1

Which muscle is supplied by the spinal accessory nerve?

Accepted Answer

Trapezius

Answer

Rhomboids major

Answer

Levator Scapulae

Answer

Subclavius

Question 2

A patient in the emergency room has been stabbed in the back of the neck and complains that he is unable to lift his shoulder. Which of the following nerves has likely been damaged?

Accepted Answer

Accessory Nerve

Answer

Suprascapular Nerve

Answer

Dorsal Scapular Nerve

Answer

Thoracodorsal Nerve

Question 3

Which is the most common muscle affected by fibrosis?

Accepted Answer

Sternocleidomastoid

Answer

Serratus anterior

Answer

Trapezius

Answer

Tendocalcaneous

Question 4

The isthmus of the thyroid gland is located across which tracheal rings?

Accepted Answer

2nd to 4th

Answer

3rd to 5th

Answer

5th and 6th

Answer

4th only

Question 5

Which of the following statements about the thyroid gland is TRUE?

Accepted Answer

It is ensheathed by the pretracheal layer of the deep cervical fascia.

Answer

Its isthmus lies at the level of the first and second tracheal cartilages.

Answer

The superior thyroid artery is related to the recurrent laryngeal nerve.

Answer

The thyroidea ima artery mostly arises from the subclavian artery.

Question 6

A 54-year-old man with a long history of smoking is diagnosed with squamous cell carcinoma of the larynx. During a radical neck dissection to remove the tumor and regional lymph nodes, the spinal accessory nerve is severed. What movement would the patient have the greatest difficulty performing?

Accepted Answer

Elevating the point of the shoulder (shrugging)

Answer

Abducting the arm

Answer

Adducting the arm

Answer

Laterally rotating the arm

Question 7

The first part of the vertebral artery is related to which of the following structures?

Accepted Answer

Stellate ganglion

Answer

Superior cervical ganglion

Answer

Middle cervical ganglion

Answer

Ciliary ganglion

Question 8

Which of the following is NOT a branch of the external carotid artery?

Accepted Answer

Inferior thyroid artery

Answer

Facial artery

Answer

Superior thyroid artery

Answer

Maxillary artery

Question 9

What structure is related to the upper border of the posterior belly of the digastric muscle?

Accepted Answer

Posterior auricular artery.

Answer

Occipital artery.

Answer

Ascending pharyngeal artery.

Answer

Lingual artery.

Question 10

Which of the following structures is NOT found superficial to the mylohyoid muscle in the anterior digastric triangle?

Accepted Answer

Mylohyoid artery and nerve

Answer

Deep part of the submandibular gland

Answer

Hypoglossal nerve

Answer

Parotid gland

Neck — MCQs

Neck — MCQs

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