tonsil

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tonsil

1. either of two small masses of lymphatic tissue situated one on each side of the back of the mouth
2. Anatomy any small rounded mass of tissue, esp lymphatic tissue

Tonsil

Localized aggregation of diffuse and nodular lymphoid tissue found in the region where the nasal and oral cavities open into the pharynx. The tonsils are important sources of blood lymphocytes. They often become inflamed and enlarged, necessitating surgical removal.

The two palatine (faucial) tonsils are almond-shaped bodies measuring 1 by 0.5 in. (2.5 by 1.2 cm) and are embedded between folds of tissue connecting the pharynx and posterior part of the tongue with the soft palate. These are the structures commonly known as the tonsils. The lingual tonsil occupies the posterior part of the tongue surface. It is really a collection of 35–100 separate tonsillar units, each having a single crypt surrounded by lymphoid tissue. Each tonsil forms a smooth swelling about 0.08– 0.16 in. (2–4 mm) in diameter. The pharyngeal tonsil (called adenoids when enlarged) occupies the roof of the nasal part of the pharynx. This tonsil may enlarge to block the nasal passage, forcing mouth breathing. See Lymphatic system

tonsil

[′tän·səl]
(anatomy)
Localized aggregation of diffuse and nodular lymphoid tissue found in the throat where the nasal and oral cavities open into the pharynx.
References in periodicals archive ?
There was no herniation of the temporal lobe unci or cerebellar tonsils.
In pediatric clients, the Chiari I malformation may spontaneously correct as the cerebellar tonsils rise normally with growth.
Pathophysiology of syringomyelia associated with Chiari I malformation of the cerebellar tonsils.
Chiari I malformation is a herniation of the cerebellar tonsils into the foramen magnum.
Chiari described what is now known as a Chiari type I malformation as elongated, "pegged," cerebellar tonsils, displaced into the upper cervical canal.
Position of the cerebellar tonsils is of great importance in assessment of Chiari malformation.
The cerebellar tonsils were specially noted for their position with reference to foramen magnum and symmetry.
A Chiari I malformation is a congenital anomaly characterized by a downward herniation of the cerebellar tonsils through the foramen magnum.
Chiari I Malformation: Chiari I malformation is characterized by inferior displacement of cerebellar tonsils into the rostral cervical spinal canal (Figure 4).