What does the parvocellular system do?
the part of the visual system that projects to or originates from small neurons in the four dorsal layers (the parvocellular layers) of the lateral geniculate nucleus. It allows the perception of fine details, colors, and large changes in brightness.
What do Koniocellular cells do?
AKA K-cells. Koniocellular cells make up the koniocellular layers of the lateral geniculate nucleus. They are thought to be involved with some aspects of color vision, and seem to specifically be involved with processing information from short-wavelength sensitive cone cells in the retina.
Where are Parvocellular Neurosecretory cells?
the hypothalamus
Parvocellular neurosecretory cells are small neurons within paraventricular nucleus (PVN) of the hypothalamus.
What is the koniocellular pathway?
Magno-, parvo-, and koniocellular pathways are the three visual pathways in primates. They are formed of morphologically distinct cellular layers that receive information from different types of retinal ganglion cells and project to dif- ferent layers in the primary visual cortex.
Where do Parvocellular cells receive input?
The parvocellular neurons of the visual system receive their input from midget cells, a type of retinal ganglion cell, whose axons are exiting the optic tract. These synapses occur in one of the four dorsal parvocellular layers of the lateral geniculate nucleus.
What do parvocellular neurons secrete?
The parvocellular neurons found in the parvocellular region of the PVN secrete neuropeptide releasing factors (e.g., CRH, AVP, thyrotropin releasing hormone) into the hypothalamo-hypophyseal portal vasculature.
What are Koniocellular neurons?
A koniocellular cell (konio: Greek, dust or poison, also known as K cell) is a neuron with a small cell body that is located in the koniocellular layer of the lateral geniculate nucleus (LGN) in primates, including humans.
What is the function of Koniocellular neurons in ganglion and LGN?
They are located between and within the principal layers of the lateral geniculate nucleus. These neurons receive their retinal input from blue/yellow retinal ganglion cells, and they project into cytochrome oxidase-rich blobs in the visual cortex that are involved in processing blue/yellow chromatic information.
What do parvocellular neurons release?
The parvocellular neurons of the paraventricular hypothalamic nucleus (PVNp) release oxytocin (OT) into various neural sites. The hormones of late pregnancy and the vaginocervical stimulation (VCS) which occurs during parturition promote the synthesis and release of OT.
What kind of information are the Koniocellular layers thought to signal?
Therefore, K cells are believed to relay short-wavelength visual information. Corticogeniculate axons appear to be quantitatively dominant within the LGN.