The principal parts of the upper Surface of the vocal tract:

Nasal cavity

Oral cavity

Lips

Teeth

Hard palate

Soft palate (Velum)

Uvula

Alveoral ridge

Pharynx wall

The principal parts of the lower surface of the vocal tract:

Lips

Teeth

Nasal cavity

Oral cavity

Tongue (tip, blade, front, back, roof)

Epiglottis

Larynx

Vocal folds

Trachea

Glottis

Lungs