Th. van Veen

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Recently, we have reported the peculiar topographic separation of shortwave- and middlewave-sensitive (S and M) cones in the retina of the common house mouse (Mus musculus) and in a number of inbred laboratory mouse strains derived from the same species. In an attempt to follow the phylogeny of the complementary cone fields, we have investigated the retina(More)
The ontogenetic developments of the pineal organ, parapineal organ, and retina were studied by the use of light and electron microscopy in embryos and fry of the teleost, Gasterosteus aculeatus, from 60 to 168 h after fertilization. Sixty to 66 h after fertilization, the primordium of the pineal complex is discernible in the diencephalic roofplate; the(More)
In the telencephalon and diencephalon of the eel (Anguilla anguilla L.) formaldehyde-induced fluorescence was studied microscopically and microfluorometrically with special emphasis on the innervation of the pituitary. In the telencephalon fluorescent fibers contained predominantly noradrenaline fluorophores. Fluorescent nuclei could not be established. In(More)
The pineal complex of the three-spined stickleback (Gasterosteus aculeatus L.) was investigated by light and electron microscopy, as well as fluorescence histochemistry for demonstration of catecholamines and indolamines. The pineal complex of the stickleback consists of a pineal organ and a small parapineal organ situated on the left side of the pineal(More)
Opsin-immunoreactive sites in the eye and optic nerve of the hagfish, Myxine glutinosa, were studied by use of light-microscopic pre- and postembedding peroxidase-antiperoxidase or avidin-biotin-peroxidase techniques, and the immuno-electron-microscopic protein A-gold method. At the light-microscopic level, a strong opsin immuno-reaction was obtained on the(More)
In Phodopus sungorus, as in other mammals, the pineal organ forms an important link in the transduction of photoperiodic information to the endocrine system. The sympathetic innervation, via the superior cervical ganglion, controls the metabolism of serotonin and melatonin in the pineal, which in turn is involved in the control of the gonads. In the present(More)
Supravital recordings of spectral transmission in the brains of two species of teleosts (Anguilla anguilla, Ictalurus nebulosus), an amphibian (Rana temporaria), a reptile (Lacerta muralis), two species of birds (Passer domesticus, Columba livia), and a mammal (Phodopus sungorus) indicate that photons of longer wavelengths (700–750 nm) penetrate(More)
Light-dependent motor activity and phototactic behavior was investigated in 1) untreated, 2) blinded, and 3) blinded and pinealectomized eels (Anguilla anguilla L.). Neither blinding nor blinding combined with pinealectomy interfered with the observed nocturnal motor activity or the photonegative behavior characteristic for the untreated animals. However,(More)
We have found a complex eye disease in the SJL/N mouse. This animal is closely related to the SJL/J mouse, which is homozygous for retinal degeneration (rd) and which also suffers from extraocular reticulum cell sarcomas at around 200 days of age. In the SJL/N animal, a high incidence of subretinal tumor is present at 9 days after birth. Furthermore, we(More)
m: Continuous work in the field of Retinal Transplantation baa now been carried out for more than a decade. we are at the stage where cIinicaI studies are underway. With this work, we plan on investigating the clinical and functional outcomes of fetal neural Mind cells transplanted to patients with Retinitis Pigmentosa (RP). M&Q&: Dissociated neural retinal(More)