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Nutritional Secondary Hyperparathyroidism in the Horse

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16 The Anatomy of <strong>the</strong> Parathyroid Glands <strong>in</strong> <strong>the</strong> <strong>Horse</strong><br />

7nlile I. Sta<strong>in</strong>able fat 11-1 <strong>the</strong> upper parathyroid glands<br />

Sen As, lntcrstitial fat Parcnchy matous<br />

years Subcapsular Intraglandular fat<br />

F 4/12 I I I<br />

F 8/12 l i I '<br />

It1 8/12 I I I I<br />

I; 9/12 I 1<br />

r 2 I I<br />

I\ 1 2 I/r 1 I<br />

At 5 I<br />

hl 6 I<br />

IZI 6<br />

h1 7<br />

F 8<br />

hl 8 I<br />

hl 8<br />

P 10 I<br />

A1 11<br />

F 13<br />

r 13<br />

F 14 I<br />

hl 1s I '<br />

21 15<br />

hl 16 1<br />

ill 18 I<br />

ill 24<br />

17123 10123 9123<br />

+, slight amount of fat. + +, modcratc amount of fat. + + -I-, abundant amount<br />

of fat.<br />

Table II. Sizc of epi<strong>the</strong>lial cclls <strong>in</strong> upper parathyroid glands<br />

Nuclcus Nuclcus Cell Cell Cytoplasm/<br />

diameter surface diamctcr surface nucleus<br />

I' sq. /I 1' sq. /( ratio<br />

Light chief cells 4.9 19 10.8 117 5.3<br />

(11 ~ 3,600)<br />

Dark chicf cells<br />

(I1 = 20)<br />

4.0* 10 6.5* 30 2.7<br />

Watcr-clear cclls 4.2 14 11.1 124 7.8<br />

(I1 ~ 100)<br />

Pale oxyphil cells<br />

(11 = 20)<br />

* 1ong.itud<strong>in</strong>al axis<br />

5.1 20 17.0* 220 10<br />

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