Chapter IV: Part 4

43. BROWN, W. L. The Principles of Internal Secretion. Brit. Med. Jour,
1920, II, 687–691.

44. JUMP. Discussion in Penn. Med. Jour., XXV, 81.

45. BIEDL, A. The Internal Secretory Organs.

46. HEWER, E. E. The Effect of Thymus Feeding on the Activity of the
Reproductive Organs of the Rat. Jour. of Physiology, XLVII,
1913–1914, 479.

47. LLOYD-JONES, O. and HAYS, F. A. The Influence of Excessive Sexual
Activity of Male Rabbits. 1. On the Properties of the Seminal
Discharge. Jour. of Exper. Zoology, 1918, XXV, 463.

48. WILLIAMS, W. L. Improvement of the Reproductive Efficiency of
Cattle. North Amer. Veterinarian, III, May, 1922.

DESCRIPTION OF PLATES

PLATE I.

Fig. 1. Diagrammatic sketches showing the development of a
spermatozoon from a spermatogonium.

Fig. 2. Diagrammatic sketch showing the minute structure of a
spermatozoon. The middle piece is made comparatively
thick in order to bring out the finer structures.
Adapted from Ellenberger.

PLATE II.

Fig. 3. Testicle of bull, showing extensive degeneration and
necrosis.

PLATE III.

Fig. 4. Inner part of wall of ductus deferens. Normal. × 230.

Fig. 5. Same, but showing extensive degeneration and exfoliation
of the lining membrane. × 230.

PLATE IV.

Fig. 6. Ductus deferens, showing entire exfoliation of the lining
membrane. The lumen is filled with a cellular debris. ×
50.

Fig. 7. Same, showing the degeneration of the lining membrane, and
debris in lumen. × 230.

PLATE V.

Fig. 8. Seminal vesicle of bull. High power section showing the
normal structure of the vesicular cavities.

Fig. 9. Seminal vesicle of bull. Low power. The membrane lining
the cavities is degenerated and exfoliated. The cavities
are filled with cellular debris, and exudates. There is
some increase in the interstitial tissue, and atrophy of
some of vesicular cavities.

PLATE VI.

Fig. 10. Low power section of seminal vesicle of bull. The
condition is about the same as in Fig. 9 except that it
is not quite as severe.

Fig. 11. Same as Fig. 10. High power.

PLATE VII.

Fig. 12. Testicular tubule showing normal spermatogenesis. × 230.

Fig. 13. Testicular tubule showing no evidence of mitosis. × 230.

Fig. 14. Testicular tubule. The spermatogenic epithelium is
beginning to degenerate and become cast off into the
lumen. × 230.

Fig. 15. Testicular tubule, showing almost total exfoliation of the
spermatogenic epithelium. × 230.

PLATE VIII.

Fig. 16. Testicular tubule. The seminal epithelium is entirely
degenerated. The membrana propria is markedly thickened.
× 230.

Fig. 17. Testicular tubule. The tubule is undergoing atrophy and
degeneration. The interstitial connective tissue is much
increased in amount. × 230.

Fig. 18. Same as Fig. 17, except that it is in the more advanced
stages.

Fig. 19. Testicular tubule. The spermatogenic epithelium has
undergone a sort of hydropic degeneration. The
interstitial connective tissue has become much increased
in amount and has undergone cellular infiltration.

PLATE IX.

Fig. 20. Normal structure of epididymis tubule. × 140.

Fig. 21. Epididymis tubule showing exfoliation of the lining
membrane, and cellular debris in the lumen. × 140.

Fig. 22. Atrophy and degeneration of epididymis tubule. The
interstitial connective tissue is much increased in
amount. × 140.

Fig. 23. Same, but in more advanced stage. × 140.

PLATE X.

Fig. 24. About the same as Fig. 22. × 140.

Fig. 25. Marked degeneration of epididymis tubule. There is a
cellular infiltration of the interstitial tissue. × 60.

PLATE XI.

Fig. 26. Spermatozoon, showing constriction at middle of head. The
head is also somewhat contorted. × 670.

Fig. 27. Spermatozoon. Pear shaped head. × 670.

Fig. 28. Spermatozoon. The head is quite long, and pointed at its
posterior end. × 670.

Fig. 29. Spermatozoon, showing a constriction at middle of the
head. × 670.

PLATE XII.

Fig. 30. Microcephalic spermatozoon. × 670.

Fig. 31. Spermatozoon. The head is small, and pear shaped. × 670.

Fig. 32. Macrocephalic sperm. The middle piece is much thickened. ×
670.

Fig. 33. Tailless spermatozoa. × 670.

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TRANSCRIBER’S NOTES

Page Changed from Changed to

54 [blank] Bacteriology of the Genital
Tracts of Mature Infertile or
Sterile Bulls Group VI

● Typos fixed; non-standard spelling and dialect retained. ● Enclosed italics font in _underscores_.