What are the 3 Commissures?
Commissures are fiber tracts that are defined to connect corresponding cortical areas of both telencephalic hemispheres with each other. They comprise the anterior commissure, the hippocampal commissure, and the corpus callosum.
Which is the largest commissure in mammals?
The corpus callosum
The corpus callosum is the largest commissural tract in the human brain. It consists of about 200-300 million axons that connect the two cerebral hemispheres.
What is the anterior commissure?
The anterior commissure (also labeled ac) is a large bundle of crossing fibers, which connects the olfactory bulb and parts of the cerebrum to the same areas on the opposite side.
Where is the posterior commissure?
The posterior commissure is a small fasciculus that decussates in the inferior pineal lamina, and corresponds to a white matter tract almost completely surrounded by gray matter that crosses the midline just dorsal to the cerebral aqueduct.
Which tract is a commissure?
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).
Which is the largest commissure in the brain?
The corpus callosum is the largest set of commissural fibers in the brain and is a pathway of crucial importance to speech-language functions (Fig. 2-10, B). The corpus callosum serves as the major connection between the hemispheres and conveys neural information from one hemisphere to the other.
What is valve commissure?
The commissures define a distinct area where the anterior and posterior leaflets come together at their insertion into the annulus. Several millimeters of valvular tissue separates the free edge of the commissures from the annulus.
What is the white commissure?
The anterior or ventral white commissure is a collection of nerve fibers that cross the midline of the spinal cord and transmit information from or to the contralateral side of the brain. It is present throughout the length of the spinal cord and lies behind the anterior median fissure.
What do the anterior and posterior commissure do?
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.