The Cerebrospinal Fluid as a Pathway in Neuroendocrine Integration

Laboratorio de Investigaciones Endócrino–Oncológicas, Instituto de Histología y Embriología, Facultad de Ciencias Médicas, U.N.C. Mendoza, Argentina (Received 6 August 1975) CONTENTS Page Introduction 408 Electron microscopy of intraependymal and intraventricular nerve fibres 408 Ultrastructure of nerve fibres reaching the IIIrd ventricle 408 Fibres containing neurosecretory granules 408 Fibres containing dense-cored and/or clear vesicles 409 Fibres with few or no secretory inclusions 409 Ultrastructure of nerve fibres reaching ventricular cavities other than the IIIrd ventricle 409 Ultrastructure of nerve fibres closely associated with the ependyma but which do not reach the ventricular cavities 409 Ependymal specializations 410 Secretory ependyma 410 Subcommissural organ 410 Ependyma of the suprachiasmatic recess of the IIIrd ventricle 410 Ependyma of the infundibular recess 410 Other regions of the ventricular walls 411 The pineal gland 411 Transporting ependyma 411 Ependyma of the median eminence 412 Ependyma of the neural lobe 413 Ependyma of the neural stalk 413