Page 394 - Anatomy and Physiology of Farm Animals, 8th Edition

Anatomy of the Digestive System / 379

(A)
VetBooks.ir Nasal Pharynx Esophagus
cavity

Trachea

Mouth Epiglottis

(B)
Nasal cavity Pharynx Esophagus

Mouth Epiglottis Trachea

Figure 20-9. Relationship of pharynx and mouth to larynx and esophagus during (A) normal respira­
tion and (B) swallowing.

Pharyngeal tonsil
Tubal tonsil
Lingual tonsil
Tonsil of the
soft palate
Location of
palatine tonsil
Opening into auditory tube
Pharyngeal recess

Figure 20-10. Sagittal section of the equine head, showing locations of tonsils.

The lingual tonsils consist of accumu­ tic animals. Enlargement of the pharyngeal
lations of lymphatic nodules in the base of tonsil of humans creates the condition
the tongue. These tonsils are most promi­ commonly called adenoids.
nent in the horse, ox, and pig. The openings of the auditory tubes (see
The pharyngeal tonsil is an accumula­ Chapter 12) in the nasopharynx feature
tion of lymphoid tissue in the submucosa aggregations of lymphatic nodules, the
of the dorsal pharyngeal wall of all domes­ tubal tonsils.