Trachea

The trachea leads to the terminal bronchioles. The major histologic changes occurring in the passage from the trachea to the bronchioles are summarized in Table 1-6-1.

Table 1-6-1. Histologic Features of Trachea, Bronchi, and Bronchioles

Trachea

Bronchi

Bronchioles

: Epithel i a

Pseudo stratified ciliated columnar (PCC) cells, goblet cells

PCC to simple columnar cells

Ciliated, some goblet cells, Clara cells in terminal bronchioles

, Cartilage

16-20 C-shaped cartilaginous rings

Irregular plates

None

j Glands

Seromucous glands

Fewer seromucous glands

None

Smooth muscle

Between open ends of C-shaped cartilage

Prominent

Highest proportion of smooth muscle in the bronchial tree J

Elastic fibers

Present

Abundant

Abundant j

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