Limbic System Anatomy Flashcards
What are the cortical components of the limbic system?
The cingulate gyrus, medial orbito-frontal gyri, gyrus rectus, entorhinal cortex, perirhinal cortex, and parahippocampal cortex.
What cortical gyrus is adjacent to the corpus callosum?
The cingulate gyrus.
What are the limbic structures supplied by the anterior cerebral artery?
The anterior cingulate gyrus and medial orbito-frontal cortex.
What can an occlusion of the ACA resulting in damage to the limbic structures it provides cause?
Abulia (lack of motivation).
What are the symptoms of abulia?
Reduced spontaneous movement/thought/speech, lack of interest in social interaction, and increased response time to queries.
What are the limbic structures supplied by the posterior cerebral artery?
The hippocampal formation, entorhinal cortex, perirhinal cortex, and parahippocampal gyrus.
What is the subarachnoid space where a bilateral PCA occlusion with sparing of other midbrain/cerebellar arteries could occur?
The interpenduncular cistern.
What kind of issues could a bilateral PCA occlusion cause with regards to the limbic system?
Severe memory loss consisting of both retrograde and anterograde amnesia.
What are the parts of the frontal cortex that provide ethical and motivational context for emotional responses?
The anterior cingulate gyrus, anterior pre-frontal cortex, and medial orbito-frontal cortex.
What amygdaloid nucleus receives input from the olfactory bulbs?
The medial nucleus.
What amygdaloid nucleus receives input from the thalamus?
The lateral nucleus (sensory input relayed from the thalamus).
What amygdaloid nucleus receives input from the anterior cingulate cortex?
The basolateral complex. Also receives input from the hippocampus.
What nucleus coordinates amygdaloid output to the brainstem?
The central nucleus.
What are the three main efferent amygdaloid fiber tracts?
The anterior commissure, ventral amygdalofugal pathway, and stria terminalis.
What amygdaloid efferent fiber tract triggers conscious perceptions of emotional responses?
The ventral amygdalofugal pathway.
