Drtbalu: Created page with " Category:Laryngology Pyriform fossa: Is a potential space that lie on either side of the larynx. They are two in number. It is shaped like a pyramid with the base poin..."

2018-10-23T06:13:36Z

Created page with " Category:Laryngology Pyriform fossa: Is a potential space that lie on either side of the larynx. They are two in number. It is shaped like a pyramid with the base poin..."

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[[Category:Laryngology]]

Pyriform fossa:

Is a potential space that lie on either side of the larynx. They are two in number. It is shaped like a pyramid with the base point above and the apex below. They belong to the hypopharyngeal area of the pharynx. It has two parts; the shallow upper part and a deeper lower part.

Boundaries:

Lateral - Mucosa lining the lamina of thyroid cartilage

Medial - Aryepiglottic fold and arytenoid cartilages above

cricoid cartilage below

Superiorly - lateral glosso epiglottic fold

Inferiorly - continues as the oesophagus

Deep to the mucous membrane of the pyriform fossa lies the internal laryngeal nerve
branch of superior laryngeal nerve. This nerve supplies sensation to this
area.

Importance of pyriform fossa:

1. Anatomically it is a hidden area. Any malignancy in this area will initially
cause fewer symptoms and has a tendency to present late

2. This area is rich in lymphatics. These lymphatics drain into the upper
deep cervical group of nodes. Malignancy in this area has a tendency for
distant metastasis

3. Foreign bodies commonly gets lodged here

4. Since superior laryngeal nerve lies just under the mucosa of pyriform fossa
it can be blocked using a gauze dipped in 4% xylocaine. This is known as pyriform
fossa.

5. Pooling of saliva occurs in pyriform fossa if there is any obstruction in the food passage (Jackson's sign)

[[File:Pyriform fossa.jpg|framed|center|Diagram illustrating Pyrinform fossa]]

Pyriform fossa - Revision history

Drtbalu: Created page with " Category:Laryngology Pyriform fossa: Is a potential space that lie on either side of the larynx. They are two in number. It is shaped like a pyramid with the base poin..."