Electronic Resource
Springer
Cell & tissue research
102 (1969), S. 153-171
ISSN:
1432-0878
Keywords:
Toad
;
Median eminence
;
Ependyma
;
Neurosecretion
;
Electron microscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The primary plexus of the toad hypothalamic-adenohypophysial portal system has two types of loops. The short loops are localized in the external region of the median eminence and surrounded by nerve endings and glial cells. The long loops approach the ependymal lining of the median eminence. The ascending and descending branches of these loops are surrounded by nerve and ependymal endings and glial cells. The actual subependymal portion of the long loops is virtually in contact with ependymal processes only, which form a “cuff” interposed between this portion of the long loops and the fibres of the hypothalamic-neurohypophysial tract. Many of the vascular endings of the ependymal processes have electron dense granules whose diameter ranges between 700 and 1400 Å. The ultrastructure of the ependymal cells suggests that these granules are transport material and not secretory material. This anatomical arrangement linking the ependyma of the median eminence and the long loops of the primary plexus of the hypothalamic-adenohypophysial portal system makes the possibility of an interrelationship between the cerebrospinal fluid and the portal blood very considerable.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00335497
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