Triangles of the Neck & Thyroid Gland Practice Questions

Question 1

Which muscle is innervated by a branch of the ansa cervicalis? A. Sternocleidomastoid B. Platysma C. Sternohyoid D. Trapezius

Answer 1

C Branches from the ansa cervicalis innervate most of the infrahyoid muscles, including the sternothyroid muscle, sternohyoid muscle, and the omohyoid muscle.

Question 2

The layer of encircling cervical fascia that splits to enclose sternocleidomastoid and trapezius muscles is the: A. Superficial fascia B. Superficial layer of deep fascia C. Alar fascia D. Prevertebral fascia E. Visceral fascia

Answer 2

B

Question 3

Which of the following is a dorsal ramus of a spinal nerve? A. Supraclavicular n. B. Transverse cervical n. C. Great auricular n. D. Greater occipital n. E. Lesser occipital n.

Answer 3

D

Question 4

Which of the following statements best describes the inferior thyroid arteries? A. They arise from the external carotid arteries B. They cross over the superior cervical sympathetic ganglion C. They supply most of the anterior surface of the thyroid gland D. They often supply all four parathyroid glands

Answer 4

D

Question 5

A 35-year-old woman was diagnosed with an adenoma of the thyroid gland. This required excision of the lower pole (left lobe) of the gland and ligation of the artery supplying that region. Which of the following nerves accompanying the artery is most likely to be damaged if the surgeon is not careful? A. External branch of the superior laryngeal B. Internal branch of the superior laryngeal C. Recurrent laryngeal D. Vagus proper E. Sympathetic trunk

Answer 5

C

Question 6

The superior belly of the omohyoid forms the anterior border of which cervical triangle? A. Carotid B. Muscular C. Omoclavicular D. Omotrapezius E. Submandibular

Answer 6

A

Question 7

The carotid body is innervated by a branch of which of the following nerves? A. Glossopharyngeal nerve B. Hypoglossal nerve C. Spinal accessory nerve D. Sympathetic trunk E. Vagus nerve

Answer 7

A

Question 8

Describeborders and subdivisions of Anterior Triangle

Answer 8

Base formed by the inferior margin of the

mandible.

Lateral border by anterior wall of SCM muscle

Medial border by midline of neck.

Subdivided into

• submental
• submandibular
• carotid
• muscular triangles

Question 9

Describeborders and subdivisions of Posterior Triangle

Answer 9

Base formed by the lateral third of clavicle.

Medial border by the SCM muscle.

Lateral border by anterior border of trapezius.

Subdivided into

• occipital triangle
• subclavian triangle