In the lateral wall of the nasopharynx

Nasopharynx

The nasopharynx is the uppermost part of the pharynx. It extends from the base of the skull to the upper surface of the soft palate; it differs from the oral and laryngeal parts of the pharynx in that its cavity always remains patent .-Lateral:On its lateral wall is the pharyngeal ostium of the...

, the salpingopalatine fold, smaller than the salpingopharyngeal fold

Salpingopharyngeal fold

A vertical fold of mucous membrane, the salpingopharyngeal fold, stretches from the lower part of the torus tubarius; it contains the Salpingopharyngeus muscle....

, stretches from the upper part of the torus tubarius

Torus tubarius

The base of the cartilaginous portion of the Eustachian tube lies directly under the mucous membrane of the nasal part of the pharynx, where it forms an elevation, the torus tubarius, the torus of the auditory tube, or cushion, behind the pharyngeal orifice of the tube...

 to the palate anteroinferiorly; it contains the levator veli palatini

Levator veli palatini

The levator veli palatini is the elevator muscle of the soft palate in the human body. During swallowing, it contracts, elevating the soft palate to help prevent food from entering the nasopharynx...

 muscle. The tensor veli palatini is lateral to the levator and does not contribute the fold, since the origin is deep to the cartilaginous opening.

It is anterior to the salpingopharyngeal fold

Salpingopharyngeal fold

A vertical fold of mucous membrane, the salpingopharyngeal fold, stretches from the lower part of the torus tubarius; it contains the Salpingopharyngeus muscle....

.

External links

• http://ect.downstate.edu/courseware/haonline/labs/L31/140103.htm