Question

____________encloses thyroid, responsible for its movement during swallowing
A. Prevertebral fascia
B. Pretracheal fascia
C. Investing layer of the deep cervical fascia
D. Superficial fascia

Answer 1

Hint:
Before we proceed into the problem, it is important to know the definition of thyroid.
The thyroid is a small gland located in the neck just below Adam's apple. It produces hormones that regulate many aspects of metabolism, including fat storage and energy production. Dysfunction of the thyroid can lead to problems such as weight gain, fatigue, depression, slowed cognitive function, and hyperthyroidism (an over-active thyroid).

Complete answer:
Swallowing involves the mandible and maxilla, both of which enclose the thyroid. The lower jaw moves up and down due to muscle contraction, moving the thyroid into and out of contact with the larynx (voice box) during swallowing.
The thyroid is a small gland that lives in the neck and produces hormones called triiodothyronines (T3) and thyroxine (T4). Thyroid hormones regulate metabolism, growth, weight gain/loss, reproduction, moods and emotions, the color of hair and nails. Thyroid gland surrounds parathyroid glands which are responsible for different activities like calcium absorption from the intestine etc.
Pretracheal fascia is attached to the hyoid bone above and the fibrous pericardium below, where it is carried down in front of the trachea and major vessels at the root of the neck. This layer completes the compartment holding the thyroid gland, the throat, and esophagus, the larynx and the trachea, and is joined on either side with the prevertebral fascia.
Therefore, the Pretracheal fascia encloses the thyroid, responsible for its movement during swallowing.

Option ‘B’ is correct

Note:
The pretracheal fascia helps to build the carotid sheath by extending medially in front of the carotid arteries. After wrapping around the thyroid gland, it is extended in front of the trachea to meet the similar layer on the opposing side.