Not true about pyriform fossa
**Core Concept**
The pyriform fossa is a part of the laryngeal vestibule, which is the upper portion of the larynx. It is a funnel-shaped area where the epiglottis and the aryepiglottic folds meet.
**Why the Correct Answer is Right**
The pyriform fossa is a site for the attachment of the aryepiglottic folds, which are composed of mucous membrane and are involved in the closure of the larynx during swallowing. The pyriform fossa is also a site for the attachment of the ventricular folds (false vocal cords). The pyriform fossa is lined by mucous membrane and is a part of the respiratory tract.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the pyriform fossa is not a part of the pharynx.
**Option B:** This option is incorrect because the pyriform fossa is not a site for the attachment of the epiglottis.
**Option C:** This option is incorrect because the pyriform fossa is not a part of the glottis.
**Option D:** This option is incorrect because the pyriform fossa is not a site for the attachment of the cricoid cartilage.
**Clinical Pearl / High-Yield Fact**
The pyriform fossa is an important area for laryngoscopy and endoscopy, as it is a site for the attachment of the aryepiglottic folds and the ventricular folds.
**Correct Answer: A.**