Development and Aging of the Vertebrate Visual System by D.E. Lorke

By D.E. Lorke

Distinct subject factor: Neuroembryology and getting older 2006/2007, Vol. four, No. 1-2 This particular subject factor of 'Neuroembryology and getting older' comprises contributions discussing the topic in-depth. 'Neuroembryology and getting older' is a well-respected, foreign peer-reviewed magazine in Neurology. particular subject matters are incorporated within the subscription.

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1). e. not traversed by blood vessels. However, a high-pressure dissolved oxygen is available for its high metabolic demand by a series of vascular connections. In the trout, the choroid rete mirabile is supplied with doubly oxygenated blood by the ophthalmic artery which is the efferent blood vessel of the pseudobranch. The pseudobranch (a hemigill) in turn is fed by the efferent artery of the first gill arch. g. ‘adult’ eels (in contrast to larval eels) and catfish lack them]. In addition, some teleosts possess a vascular falciform process which receives its blood from the lentiform body (another countercurrent system, which in turn receives its blood from the choriocapillaris).

4. TEM of double cones of P. reticulata showing a highly dense ellipsosome in a double cone of the ventral area. 7,000. E = ellipsosome; M = mitochondria; SS = subsurface membranes. Inset showing diagram of a dorsoventral section through the optic nerve (ON). ) Lactate Dehydrogenase Pattern of Trout and Guppy Eye In teleosts, the glycolytic enzyme lactate dehydrogenase (LDH) presents three loci (A, B and C), with the C4- isozyme being primarily expressed in retinal photoreceptors and optical parts of the brain.

From Schmitt and Kunz [38], with kind permission of S. ) ventronasal patch. At 70–74 hpf photoreceptor synapses form triads (consisting of two lateral horizontal cell processes and a central bipolar cell process opposing the ribbon; fig. 32a). Inner Nuclear Layer At 50 hpf this layer is 25 ␮m wide. Horizontal cells are small and irregularly shaped. In the midregion spindleshaped neuroblasts (presumptive bipolar cells) are observed. Lightly staining presumptive nuclei of amacrine cells are evident.

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