Limbic System + Reticular Formation Flashcards
Anatomically what are the structures in the limbic system?
Subcallosal gyrus
Cingulate gyrus
Parahippocampal gyrus
Hippocampal formation
Amygdaloid nucleus
Mammillary bodies
Anterior thalamic nucleus
What are the connecting pathways of the limbic system?
Alveus (comes from hippocampus)
Fimbria (comes from alveus)
Fornix
Striae terminalis
Mammillothalamic tract
What makes up the hippocampal formation?
Hippocampus
Dentate gyrus
Parahippocampal gyrus
The stria terminalis emerges from which nucleus?
Amygdaloid nucleus
What are the afferent connections of the hippocampus?
Fibers from:
Cingulate gyrus
Septal nuclei
The other hippocampus
Infusion griseum
Entorhinal area
Dentate and parahippocampal gyri
What are the efferent connections of the hippocampus?
Fibers end in the:
Medial nucleus
Anterior nuclei of thalamus
Tegmentum of midbrain
Septal nuclei, lateral Preoptic area, anterior part of hypothalamus
Habenular nuclei
What are the functions of the limbic system?
Controls:
Emotions
Behavior
Drive/ survival
Memory
Note: its connection to hypothalamus + control of endocrine system allows it to control many aspects of emotional behavior
What is Kluver Bucy syndrome?
Destruction of the amygdaloid nucleus results in:
Docile
No fear/no anger
Hypersexual
Hyperphagia
Note: No memory disturbance
What is the reticular formation?
Deeply placed continuous network of nerve cells and fibers that extend throughout the brainstem, subthalamus, hypothalamus and thalamus
What are the 3 longitudinal columns of the reticular formation?
Median (with intermediate sized neurons)
Medial (with large neurons)
Lateral (small neurons)
What can the reticular columns modulate?
Muscle tone and reflex activity
Somatic and visceral sensations
ANS
Endocrine functions
Biological clocks
Reticular activating system (arousal and consciousness)
Damage to the reticular formation can cause what?
Loss of consciousness and comas
