What is the function of a commissure?
The anterior commissure works with the posterior commissure to link the two cerebral hemispheres of the brain and also interconnects the amygdalae and temporal lobes, contributing to the role of memory, emotion, speech and hearing. It also is involved in olfaction, instinct, and sexual behavior.
What is commissure meaning?
1 : a point or line of union or junction especially between two anatomical parts (such as adjacent heart valves) 2 : a connecting band of nerve tissue in the brain or spinal cord.
What is the function of posterior commissure?
The posterior commissure is the inferior lamina or stalk of the pineal gland and is important in language processing and connects the language processing centres of both cerebral hemispheres. It is closely related in function to the splenium of the corpus callosum, and injury to it may lead to disorders such as alexia.
What are commissures made of?
The five are the anterior commissure, posterior commissure, corpus callosum, commissure of fornix (hippocampal commissure), and habenular commissure. They consist of fibre tracts that connect the two cerebral hemispheres and span the longitudinal fissure.
What does the forebrain contain?
By far the largest region of your brain is the forebrain (derived from the developmental prosencephalon), which contains the entire cerebrum and several structures directly nestled within it – the thalamus, hypothalamus, the pineal gland and the limbic system.
How many commissures are there?
What is commissure in nervous system?
Commissural fibers of the brain, also known as commissural tracts of the brain or commissures are a type of white matter tract that cross the midline, connecting the same cortical area in opposite hemispheres (right-left hemispheric connections 3).
What is the function of anterior and posterior commissure?
The anterior commissure connects the olfactory bulbs, amygdaloid nuclei, and the medial and inferior temporal lobes. The posterior commissure fibers connect areas in the occipital lobes, primarily areas concerned with pupillary response and eye movement control.
What do association fibers do?
The association fibers interconnect various areas of cortex within the same hemisphere. These may be short association fibers that connect the cortices of adjacent gyri or long association fibers that interconnect more distant areas of cortex (Fig. 16.13).
What does the neocortex do?
The neocortex is the center for higher brain functions, such as perception, decision-making and language. Our group focuses on the mechanisms governing neocortex development, with a strong interest on the role and regulation of the neural stem cells.
What is the neocortex ratio?
The neocortex ratio of a species is the ratio of the size of the neocortex to the rest of the brain. A high neocortex ratio is thought to correlate with a number of social variables such as group size and the complexity of social mating behaviors.
How does a series circuit of light bulbs work?
If the light bulbs are connected in parallel, the current flowing through the light bulbs combine to form the current flowing in the battery, while the voltage drop is 6.0 V across each bulb and they all glow. In a series circuit, every device must function for the circuit to be complete. One bulb burning out in a series circuit breaks the circuit.
What is the medical definition of a commissure?
com′mis·su′ral adj. commissure. 1 a band of nerve fiber or other tissue that crosses from one side of the body to the other, usually connecting two structures or masses of tissue. 2 a site of union of two anatomical parts, as the corner of the eye, lips, or labia.
What causes a light bulb to become dimmer?
For bulbs that are added in series, the additional bulb (s) will share the electric current flowing through the circuit hence the bulbs will become dimmer (Figure 5, right). For bulbs that are added in parallel, the additional bulb (s) will have the same amount of electric current flowing through and each bulb does not share the electric current.
How many light bulbs are in a circuit?
Consider a very simple circuit consisting of four light bulbs and one 6 V battery. If a wire joins the battery to one bulb, to a second bulb, to a third bulb, then back to the battery, in one continuous loop, the bulbs are said to be in series.