Symmetric alterations in the medial thalami, mammillary bodies, periaqueductal region and tectal
plate are the common typical lesions.
These grains are monosulcate and have reticulate-columellar exine structure; Couper and other early authors (e.g., Brenner, 1963; Doyle, 1969) described the columellae as varying from free to fused at their heads to form a tectal
reticulum, but SEM studies showed that they are typically reticulate (Doyle et al., 1975; Hughes et al., 1979).
For example, intense somatic staining was evident in cells directly adjacent to the telencephalic ventricles (TelV; Figure 1B), the rhombocephalic ventricles (RV; Figures 1A, 1C), the tectal
ventricle (TeV; Figure 1D), and the hypothalamic diencephalic ventricle (DiV; Figure 1E).
Typically, MRI scan results are symmetrical lesions in the mammillary bodies, thalami, tectal
plate, and periaqueductal area which showed increased T2 signal in these sites. In our case, brain computed tomography scan result was unremarkable.
codification of eye movements in goldfish studied by electrical microstimulation.
Calculation of the ETVSS * Score Age Etiology 0 <1 mo Postinfectious 10 1 mo to <6 mos 20 Myelomeningocele, IVH, nontectal brain tumor 30 6 mos to <1 yr Aqueductal stenosis, tectal
tumor, other 40 1 yr to < 10 yrs 50 [greater than or equal to]10 yrs Calculation of the ETVSS * Score Previous Shunt 0 Previous shunt 10 No previous shunt 20 30 40 50 * The ETVSS is calculated as age score + etiology score + previous shunt score.
Gaze, "Selection of appropriate tectal
connections by regenerating optic nerve fibers in adult goldfish," Experimental Neurology, vol.
glioma is a relatively benign tumour and presents with symptoms of obstructive hydrocephalus with good prognosis.
Marked flattening of the tectal
plate was noted due to cerebral aqueductal dilatation and dilated perimesencephalic cisterns.