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It has been suggested that these axons would fulfil the necessary cytochemical and anatomical requirements for axons supplying the hypothalamic factors; but the matter is still in some doubt (Fuxe, 1963; J0rgensen, 1965). Wherever they come from, the axons carrying the releasing and inhibit­ ing factors must all make contact with the circulation to the pars distalis of the adenohypophysis, where it comes in contact with the floor of the infundibular recess (Fig. 2-8). In Teleostei, the extent of this circulation is very slight, and the factors seem virtually to diffuse through the capillaries, rather than being circu­ lated within them, to arrive directly among the adenohypophysial cells (Fig.

The antecedents of the granules are probably synthesized within the ergastoplasm (at a), thence transferred to the Golgi apparatus (at b) where they become electron dense by concentration between the lamellae and eventually fill the terminal vesicles (at c). Next, the vesicles bud off surrounded by a membrane furnished by the Golgi lamellae and accumulate (at d) in the perikaryon round the nucleus (e). The granules are stored in the intercisternal space of the ergastoplasm, which becomes dis­ organized.

Whence the blood finally drains into the jugular veins. n. , medulla oblongata. 114 NEUROSECRETORY CELLS 37 In either case, the capillaries drain by the hypophysial portal system, as they do in lower tetrapods, and break up into the secondary capillary plexus, which ramifies through the pars distalis of the adenohypophysis, to bring the hypothalamic factors into contact with all its secretory cells (Figs. 2-4c and 2-9). Reflex nervous arcs in the diencephalon are discussed in a later chapter, in connection with the part that these arcs play in controlling the activity of the hypothalamic neurosecretory cells and the relation of their secretion to internal and external stimuli reaching the brain (arrows in Fig.

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