What is connected by 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.
What is function of anterior commissure?
The anterior commissure works with the posterior commissure to link the two cerebral hemispheres of the brain and also interconnects the amygdalas and temporal lobes, contributing to the role of memory, emotion, speech and hearing. It also is involved in olfaction, instinct, and sexual behavior.
Is the anterior commissure part of the fornix?
The anterior commissure (also known as the precommissure) is a white matter tract (a bundle of axons) connecting the two temporal lobes of the cerebral hemispheres across the midline, and placed in front of the columns of the fornix.
What is the lamina terminalis?
The lamina terminalis is a thin sheet of gray matter and pia mater that attaches to the upper surface of the chiasm and stretches upward to fill the interval between the optic chiasm and the rostrum of the corpus callosum.
What crosses in the anterior 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.
Is lamina terminalis a commissure?
Early in development, crossing fibers from each cerebral ventricle form together in the lamina terminalis to create the anterior commissure.
Where is the lamina terminalis?
the third ventricle
The lamina terminalis is a forebrain structure lying on the anterior wall of the third ventricle that plays a key role integrating signals for the regulation of numerous aspects of homeostasis including not only cardiovascular function but also immune, reproductive, and metabolic functions.
Why is the anterior commissure important in brain scanning?
Why the commissures? The commissure have become key landmarks, because Talairach and Tournoux chose them to determine the standard alignment of the brain for their famous atlas. To align a scan to Talairach space, a brain has to be set so that the anterior and posterior commissures are on a horizonatal line.
What is lamina terminalis?
Where is the anterior commissure located?
The anterior commissure is located in the anterior wall of the third ventricle at the upper end of the lamina terminalis. It runs across the midline in front of the anterior columns of the fornix, above the basal forebrain and beneath the medial and ventral aspect of the anterior limb of the internal capsule.
What does the lamina terminalis become?
The lamina terminalis is immediately anterior to the tuber cinereum; together they form the pituitary stalk.
What is the difference between Connective and commissure?
“Commissure” is a noun, and it refers to a place where two parts of the body unite. For example, the “median commissure” of the brain is the collection of axons (white matter) where the two sides of the brain connect. “Connective” is an adjective, and it refers to something which attaches one thing to another.
Is lamina terminalis paired?
The neural circuitry of the lamina terminalis involves both afferent and efferent connections to several other regions of the brain, and neurons within the individual components of lamina terminalis are reciprocally connected with each other.
What is the transverse commissure?
The commissural fibers or transverse fibers are axons that connect the two hemispheres of the brain. In contrast to commissural fibers, association fibers connect regions within the same hemisphere of the brain, and projection fibers connect each region to other parts of the brain or to the spinal cord.