SCID 242 -quiz 8 - Neck (Ant. Triangle)

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    Which muscle is innervated by a branch of the ansa cervicalis? 

    • Sternocleidomastoid
    • Platysma
    • Sternohyoid
    • Trapezius
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SCID 242 -quiz 8 - Neck (Ant. Triangle) - Quiz
About This Quiz

SCID 242 -Quiz 8 focuses on the anterior triangle of the neck, assessing knowledge on nerve damage, muscle innervation, and surgical implications involving the thyroid and surrounding nerves. This quiz is crucial for medical students and professionals in understanding neck anatomy and surgical risks.

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  • 2. 

    A 50-year-old woman is diagnosed as having a thyroid tumor. Surgery to remove the cancerous growth is undertaken. In which triangle of the neck will the surgeon make an incision to gain access to the gland? 

    • Carotid

    • Muscular

    • Subclavian

    • Submandibular

    • Submental

    Correct Answer
    A. Muscular
    Explanation
    The muscular triangle is found in the anterior triangle of the neck. It is bounded by the midline as its medial border, the superior belly of the omohyoid as its superolateral border, and sternocleidomastoid as its inferolateral border. The strap muscles, thyroid, and parathyroids are found in this triangle.

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  • 3. 

    A six-year-old child, whose medical history includes a rather difficult birth, has a permanently tilted head posture, with the right ear near the right shoulder and the face turned upward and to the left. Which of the following muscles was very likely damaged during birth? 

    • Anterior scalene

    • Omohyoid

    • Sternocleidomastoid

    • Trapezius

    • Platysma

    Correct Answer
    A. Sternocleidomastoid
    Explanation
    If the sternocleidomastoid is damaged at birth and becomes shortened, a patient may have muscular torticollis.

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  • 4. 

    A person receives a shallow knife wound just behind the sternocleidomastoid muscle and about 1 1/2 inches above the clavicle. There is an immediate numbness of the skin below the wound and over the acromion and clavicle. The nerve most likely severed was the _______

    • Greater auricular

    • Lesser occipital

    • Supraclavicular

    • Suprascapular

    • Transverse cervical

    Correct Answer
    A. Supraclavicular
    Explanation
    The supraclavicular nerves come from C3 and C4 in the cervical plexus. These cutaneous nerves provide sensory innervation to the skin of the root of the neck, upper chest, and upper shoulder. These nerves innervate the skin right above the clavicle, so they are the correct answer.

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  • 5. 

    A 20 year old man was brought into the emergency room with a stab wound in the upper part of the neck. Although there was no major damage done, he lost sensation from the skin over the angle of the jaw. Which nerve has been cut? 

    • Supraclavicular n.

    • Transverse cervical n.

    • Great auricular n.

    • Greater occipital n.

    • Lesser occipital n.

    Correct Answer
    A. Great auricular n.
    Explanation
    The great auricular nerve comes from C2 and C3 branches of the cervical plexus; it provides sensory innervation to the ear and the skin below the ear, including the angle of the jaw.

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  • 6. 

    You are called on to do a venous catheterization to measure central venous pressure in the heart. Which muscle of the neck would provide the best area of approach to the internal jugular vein? 

    • Anterior scalene

    • Digastric

    • Omohyoid

    • Sternocleidomastoid

    • Sternohyoid

    Correct Answer
    A. Sternocleidomastoid
    Explanation
    The internal jugular vein is found in the carotid triangle, which is bounded medially by omohyoid, laterally by sternocleidomastoid, and superiorly by the posterior belly of digastric. Of these three muscles, sternocleidomastoid is the easiest landmark to find on the neck and the most practical muscle to find when looking for the carotid triangle and the internal jugular vein.

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  • 7. 

    Exploration of the tracheoesophageal groove at the level of the thyroid gland would reveal what important structure bilaterally? 

    • Cervical sympathetic trunk

    • Phrenic nerve

    • Pyramidal lobe

    • Recurrent laryngeal nerve

    • Superior thyroid artery

    Correct Answer
    A. Recurrent laryngeal nerve
    Explanation
    The left and right recurrent laryngeal nerves can be found in the left and right tracheoesophageal grooves. This is a very characteristic relationship that you need to know! The cervical sympathetic trunk is much deeper in the neck--it lies in the prevertebral fascia, in front of the prevertebral muscles.

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  • 8. 

    Any irritation of the diaphragm (e.g. infection, tumor) may create referred pain that seems (to the patient) to originate in the area atop the shoulder. This is due to the fact that the phrenic nerve shares spinal segments with what cutaneous nerve in the shoulder region? 

    • Dorsal scapular

    • Lesser occipital nerve

    • Long thoracic nerve

    • Supraclavicular nerve

    • Suprascapular nerve

    Correct Answer
    A. Supraclavicular nerve
    Explanation
    The phrenic nerve consists of contributions from the ventral primary rami of C3, C4, and C5. The supraclavicular nerves come from the C3 and C4 roots of the cervical plexus. So, these nerves share spinal segments.

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  • 9. 

    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? 

    • External branch of the superior laryngeal

    • Internal branch of the superior laryngeal

    • Recurrent laryngeal

    • Vagus

    • Sympathetic trunk

    Correct Answer
    A. Recurrent laryngeal
    Explanation
    The inferior thyroid artery supplies the lower lobes of the thyroid. It is a branch of the thyrocervical trunk. Branches of this artery cross the recurrent laryngeal nerve, so this is the nerve that might be damaged during the surgery.

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  • 10. 

    One of the motor components of the cervical plexus, the ansa cervicalis, innervates all of the following muscles except the: ________

    • Omohyoid

    • Sternohyoid

    • Sternothyroid

    • Stylohyoid

    • Thyrohyoid

    Correct Answer
    A. Stylohyoid
    Explanation
    The stylohyoid muscle runs from the posterior portion of the digastric muscle to the body of the hyoid bone. It elevates and retracts the hyoid, and it is innervated by the facial nerve (CN VII). Omohyoid, sternohyoid, sternothyroid, and thyrohyoid are all strap muscles which are innervated by ansa cervicalis (although thyrohyoid receives its branch via the hypoglossal nerve).

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  • Current Version
  • Mar 19, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 06, 2015
    Quiz Created by
    Permphan
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