What is hippocampal commissure?

What is hippocampal commissure?

The hippocampal commissure is fibers that connect contralateral hippocampi via the crura of the fornix and run beneath the posterior portion of the corpus callosum.

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 a commissure in the brain?

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 the 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.

Which is the largest commissure in the brain?

corpus callosum

What is Habenular commissure?

The habenular commissure, is a brain commissure (a band of nerve fibers) situated in front of the pineal gland that connects the habenular nuclei on both sides of the diencephalon.

What is Interthalamic adhesion?

The interthalamic adhesion is a flattened band of tissue that connects both parts of the thalamus at their medial surfaces. The medial surfaces form the upper part of the lateral wall to the third ventricle. ... The interthalamic adhesion is notably enlarged in patients with the type II Arnold-Chiari malformation.

What is the Habenular nucleus?

The habenular nuclei (habenula is Latin for "little rein") acts as a regulator of key central nervous system neurotransmitters, connecting the forebrain and midbrain within the epithalamus.

Where in the brain is the Habenular nuclei involved in olfaction located?

The habenular nuclei are located just anterior to the pineal gland and consist of a large lateral nucleus and a small medial nucleus (Figs. 15.

What is fasciculus Retroflexus?

The fasciculus retroflexus (FR) fiber bundle comprises the intense cholinergic projection from the medial division of the habenula nucleus (Hbn) of the epithalamus to the interpeduncular nucleus (IPN) of the limbic midbrain.

Where is the habenula located?


What is Metathalamus?

The metathalamus is a region of the thalamencephalon formed by the medial and lateral geniculate bodies bilaterally. It serves as an important relay nucleus in both the auditory and visual pathways.

What are the 7 structures of the Diencephalons?

The diencephalon consists of the following structures:

  • Thalamus.
  • Hypothalamus including the posterior pituitary.
  • Epithalamus which consists of: Anterior and Posterior Paraventricular nuclei. Medial and lateral habenular nuclei. Stria medullaris thalami. Posterior commissure. Pineal body.
  • Subthalamus.

Where is Metathalamus located?

The metathalamus comprises the geniculate bodies which originate as slight outward bulgings of the alar lamina. In the adult the lateral geniculate body appears as an eminence on the lateral part of the posterior end of the thalamus, while the medial is situated on the lateral aspect of the mid-brain.

What happens if the Diencephalon is damaged?

Diencephalic lesions can cause severe and long-lasting amnesia. Damage to certain nuclei and fiber systems within the diencephalon interrupt the flow of information between key memory structures.

What seven areas of the body does the hypothalamus control?

What seven areas of the body does the Hypothalamus control? The Hypothalamus controls the ANS, center of emotional responses, body temperature regulation, regulation of food intake, regulation of water balance and thirst, regulation of sleep-wake cycles, control of endocrine functions.

How would damage to the cerebellum affect the body?

Damage to the cerebellum can lead to: 1) loss of coordination of motor movement (asynergia), 2) the inability to judge distance and when to stop (dysmetria), 3) the inability to perform rapid alternating movements (adiadochokinesia), 4) movement tremors (intention tremor), 5) staggering, wide based walking (ataxic gait ...

What happens if the medulla is damaged?

It plays an essential role in passing messages between your spinal cord and brain. It's also essential for regulating your cardiovascular and respiratory systems. If your medulla oblongata becomes damaged, it can lead to respiratory failure, paralysis, or loss of sensation.

Can you live if your brain stem is damaged?

When the brain stem stops working, the brain cannot send messages to the body to control our unconscious functions, and equally cannot receive messages back from the body. If this is the case, then the person has no chance of recovery, the damage is irreversible and according to UK law, the person has died.

How does the medulla affect behavior?

The medulla oblongata plays a critical role in transmitting signals between the spinal cord and the higher parts of the brain and in controlling autonomic activities, such as heartbeat and respiration. Dissection of the left hemisphere of the human brain, showing the internal capsule and middle cerebellar peduncle.

Why does damage to the medulla oblongata cause death?

The medulla oblongata controls involuntary functions such as heart beat, rate of respiration, secretion of saliva, gut peristalsis etc. Injury to the medulla oblongata may stop important activities such as heart beat, respiration etc. This results in death.

Which part of the brain if damage is fatal?

They are the pons, midbrain and medulla oblongata. When an injury occurs to any or all of these three areas, the consequences can be devastating. Heartbeat and breathing can cease, causing death. The brain-stem can become compressed due to swelling, leading to hemorrhaging and stroke.

What brain damage feels like?

It causes headaches, confusion, memory problems, and nausea. In a moderate brain injury, symptoms can last longer and be more pronounced. In both cases, most patients make a good recovery, although even in mild brain injury 15% of people will have persistent problems after one year.

Can a person who is brain dead open their eyes?

A person who is brain dead is dead, with no chance of revival. Coma: A state of profound unresponsiveness as a result of severe illness or brain injury. Patients in a coma do not open their eyes or speak, and they do not exhibit purposeful behaviors. Some patients need ventilators while others do not.

Do brain dead patients feel pain?

Does an individual feel any pain or suffer after brain death is declared? No. When someone is dead, there is no feeling of pain or suffering.

How long can a person be dead and still be revived?

Blood circulation can be stopped in the entire body below the heart for at least 30 minutes, with injury to the spinal cord being a limiting factor. Detached limbs may be successfully reattached after 6 hours of no blood circulation at warm temperatures. Bone, tendon, and skin can survive as long as 8 to 12 hours.

Can the brain repair itself?

Scientists now know that the brain has an amazing ability to change and heal itself in response to mental experience. This phenomenon, known as neuroplasticity, is considered to be one of the most important developments in modern science for our understanding of the brain.

How many days a brain dead person can live?

If a person is in a permanent vegetative state but not brain-dead, their life support likely consists of fluids and nutrition. If these are stopped, it may take anywhere from a few hours to several days for the person's vital organs to shut down completely.