Lower respiratory tract consist of...

1. larynx
2. trachea
3. bronchi
4. lungs

• Series of interconnected cavities and tube bothinside and outside the lungs
• Fx- filter, warm, and moisten air

1. nose
2. pharynx
3. trachea
4. larynx
5. bronchi

Respiratory zone structures

1. Respiratory bronchioles
2. alveoli

3 Fx of interior structures of external nose

1. Warm, moisten, and filter air
2. olfaction
3. modifiy phonation

Internal Nares

(Choanae)

• Produces mucus
• resonating chamber for phonation

Superior, middle, and inferior meatus

Pharynx

(throat)

• funnel shaped tube that starts at the internal nares
• extends to cricoid cartilage (the most inferior cartilage of the larynx)

Nasopharynx- respriation

Oropharynx- digestion

Laryngopharynx- Both digestion and respiration

Pharyngeal Tonsil

(Adenoid)

[image]

 Mass of lymphoid tissue situated at the very back of the nasopharynx

• Portion of the laryngopharynx
• begins at the hyoid bone

Larynx

(Voice Box)

• Short passage
• connects laryngopharynx to trachea

Thyroid Cartilage

(Adam's Apple)

• two fused plates of hyaline cartilage
• anterior wall of larynx

• Ringe shaped hyaline carilage
• inferior wall of larynx

• Triangular pieces of hyaline cartilage
• posterior portion of larynx (superior to cricoid)

• Horn-shaped elaseic cartilage
• located at the apex of arytenoid cartilage