Tonsils - Anatomy & Physiology
The tonsils are part of the MALT and more specifically the GALT. They are located in the nasopharynx and oropharynx and form a ring of lymphoid tissue around the pharynx to protect the openings into the alimentary and respiratory systems.
The tonsils are non-encapsulated lymphoid tissue. They have crypts lined with stratified squamous epithelium which are infiltrated with lymphocytes.
Species being covered here are dog, cat, horse, cattle and pig.
Also called adenoids
Present in all the species they are located on the pharyngeal septum in the nasopharynx. In cattle it is located on the caudal end of the septum.
In common speech these are “the tonsil"
Present all species except the pig and are located dorsally in the lateral walls of oropharynx. In cattle and dogs and cats they are compact and in cattle they project away from oropharynx lumen and in cats and dogs they project towards the lumen. In horses they are diffuse.
Absent in the cat and dog. They are located in the lateral wall of the nasopharynx and provide protection to the entrance of the auditory tubes. Compact in cattle and pigs and diffuse in horses.
Found in varying degrees in all species on floor of oropharynx.
Present in the pig and are found rostrolateral to epiglottis base.
- Actinobacillus pleuropneumoniae in pigs may remain undetected by serological tests and swabbing in on the palatine tonsil
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