By Klaus J. Barteczko, Monika I. Jacob (auth.)

The testicular descent (descensus testis) is defined in an entire sequence of human fabric from degree 14 CC to the grownup kingdom by utilizing personal levels. principal sights during this paintings are solutions to questions that have been mentioned controversially via generations of scientists and that are improper or inadequately documented in so much textbooks of embryology: Does an internal gonadal descent exist? What approximately starting place, position and destiny of gubernaculum H., processus vaginalis peritonei and gonadal ligaments? How do the annexes of testis come into their ultimate place? the consequences are in accordance with serial sections, scanning electron microscopy, third-dimensional reconstructions, microdissection and immunohistochemistry.

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Additional info for The Testicular Descent in Human: Origin, Development and Fate of the Gubernaculum Hunteri, Processus Vaginalis Peritonei, and Gonadal Ligaments

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5 mm. 1, testis; 2. genital ducts; 3 cranial mesonephric ligament; 4. abdominal gubernaculum; 5. connection of caudal pole of testis with the mesenchyme of genital ducts; 6, rectum; 7. urinary bladder; 8, ureters. The arrow shows the inner inguinal ring, arrowheads show openings of ureters 41 Fig. 3Ia,b. SEM micrograph of the same foetus as in Fig. 30 but after removal of the testis. ducts . Cranial view. 5 mm b Dorsocranial view of removed testis. Bar, 0. 1 mm. 1, miilleriar duct; 2, wolffian duct; 3, fracture zone of the caudal part of testis at mesenchyme of genital ducts; 4 opposite side at isolated testis; 5, ligament which connects testis and epididymis with the posteriOi abdominal wall (mesorchium); 6, cranial mesonephric ligament; 7, right abdominal gubernaculum 8, testis; 9, epididymis (mesonephric rudiment); 10, urinary bladder.

In a 45-mm CRL male embryo, the retroperitoneal abdominal gubernaculum forms a narrow ridge elevating immediately lateral to the plica of the inferior epigastric vessels (Fig. 26a,b). The parietal peritoneum exhibits a deeper excavation between the gubernaculum and the vessels than at the lateral side of the gubernaculum. Thus, the processus vaginalis becomes medially more distinct extending into the abdominal wall (Fig. 26c). The interstitial gubernaculum (Fig. 27) broadens into loose mesenchyme descending through the external oblique aponeurosis.

Connection between caudal pole of the testis and mesenchymal surrounding of genital ducts in a 26-mm CRL male embryo (stage 22 CC) a Bipartite reconstruction block. Medial view on caudal pole of left testis connecting the dorsal duct mesenchyme by a meso. Inset: abdominal gubernaculum. Distance from section b is 91 Ilm more lateral. b Sagittal section showing connection between the caudal pole of testis and dorsal mesenchyme of genital ducts. c Further lateral, contacts of abdominal gubernaculum with duct mesenchyme.

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