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Nutritional Secondary Hyperparathyroidism in the Horse

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24 ’l’hc Anatomy of <strong>the</strong> Parathyroid Glands <strong>in</strong> thc Florsc<br />

I,ower Parathyroids<br />

The architecture, cell types, etc., of <strong>the</strong> lower parathyroids were<br />

identical to those described for <strong>the</strong> upper parathyroids. The <strong>in</strong>cidence<br />

of embryologic rudiments <strong>in</strong> <strong>the</strong> lower glands is given <strong>in</strong> Table IV<br />

(see also Fig. 3).<br />

4. Discussion<br />

The existence of two pairs of parathyroid glands <strong>in</strong> <strong>the</strong> horse was<br />

demonstrated by Hi\smmno and 1L4ro (1932) and <strong>the</strong> present study<br />

is <strong>in</strong> agreement with <strong>the</strong>ir f<strong>in</strong>d<strong>in</strong>gs. The nomenclature will now be<br />

discussed.<br />

Previous to I-IASHIMOT’O and KATO (1 932) <strong>the</strong> discussion on “external”<br />

and “<strong>in</strong>ternal” parathyroids concerned <strong>the</strong> relationship to <strong>the</strong><br />

thyroid gland. After HAsHImmo and I

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