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These diverticula make their appearance before the closure of the anterior end of the neural tube; [1] [2] after the closure of the tube around the 4th week of development, they are known as the optic vesicles. Previous studies of optic vesicles suggest that the surrounding extraocular tissues – the surface ectoderm and extraocular mesenchyme ...
The horse has a "visual streak", or an area within the retina, linear in shape, with a high concentration of ganglion cells (up to 6100 cells/mm 2 in the visual streak compared to the 150 and 200 cells/mm 2 in the peripheral area). [12] Horses have better acuity when the objects they are looking at fall in this region.
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The optic vesicles project toward the sides of the head, and the peripheral part of each expands to form a hollow bulb, while the proximal part remains narrow and constitutes the optic stalk. [1] [2] Closure of the choroidal fissure in the optic stalk occurs during the seventh week of development. The former optic stalk is then called the optic ...
The lens placode under the direction of the optic vesicle gives rise to the lens of the eye. The adenohypophyseal placode , which forms the anterior lobe of the pituitary gland . Other animals
They limit a horse's rear vision but do not restrict the horse's view as much as blinkers do. Pacifiers are hoods with mesh cups over the eyes. Pacifiers protect the wearer's eyes from injury caused by dirt or stones being kicked up by horses ahead of the wearer during a race. They may be banned from use on wet days as they may clog up with mud ...
PAX6 is essential is the formation of the retina, lens and cornea due to its role in early cell determination when forming precursors of these structures such as the optic vesicle and overlying surface ectoderm. [20]
H1. Optic vesicle (V08a). An optic vesicle forms lateral of the prosencephalic region. It can be mistaken for the trigeminal ganglion which is proportional enlarged in Tachyglossus or Monodelphis at this early period of development. But the ganglion lies more caudally. [1] Standard Event System character depiction: H. Eye (V08). H2. Lens ...