Speech Mechanism and Sound Transmission

Oral Cavity

Lips

Teeth

Hard Palate

Velum

Alveolar Ridge

Tongue

Mandible

Facial Muscles

Nasal Cavity

It extends from the nostrils (nares) to pharynx (throat)

It is important in resonance by opening or closing of velopharyngeal port

Velopharyngeal valve or port is formed by the soft palate making contact with the pharyngeal wall

It must be closed for vowels and non-nasal consonants

Pharinx

It extends from the posterior portion of the nasal cavity downward through the back of the oral cavity to the larynx

Pharynx is a vertical tube with 3 parts

Naso Pharynx

Oropharynx

Laryngopharynx

Larynx

2 Puposes of Larynx

Prevent food from going into trachea

Create a constriction in vocal tract which produces a sound source for communication

Anatomy of Larynx

Cricoid cartilage

Artynoid cartilages

Glottis

Vocal folds

Open (abducted)

Closed (adducted)