The pharynx is a musculomembranous tube located behind the nasal cavity, oral cavity, and larynx. It is lined internally by mucous membrane and extends from the base of the skull to the C6 vertebra. The pharynx is divided into three parts - the nasopharynx, oropharynx, and laryngopharynx. It connects the nasal cavity to the oral cavity and larynx and continues below into the esophagus.

2. •Musculo Membranous Tube
Situation
• behind nasal ,oral cavity,
larynx , lined by mucous
memb.(internally)
•Continues below with oesophagus
Extent - base of skull to C6
Measurements
•Length –12-14 cm
•Width
Max – 3.5 cm – naso–pharynx
Min – 1.5 cm at
pharyngo- oesophageal
junction

5. Interior of
pharynx
three parts
• Naso- pharynx
• Oro- pharynx
• Laryngo- pharynx
Anterior communications
Nasal cavity – post.nasal
aperture
Oral cavity - oro-pharyngeal
isthmus
Larynx - laryngeal inlet

24.  PYRIFORM FOSSA
 KILLIAN’S DEHISCENCE