Abstract
The authors state in the first lines of the chapter they can only report literature data. The inputs are studied first (afferent fibres to the amygdala come from the olfactory tract, midbrain, forebrain and brainstem). The outputs are discussed in reference to connection pathways seen in the previous chapter. Also reviewed are the amygdalofugal fibres joining the structures studied in the inputs.
An overview of the amygdala physiology is closing the chapter.
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Notes
- 1.
HT Ghashghaei et al. (2007) also observed projections towards the amygdala, from the lateral prefrontal cortex, but they are much more rare and scattered than those from the orbitofrontal and medial frontal areas. Moreover, these projections go preferentially to the baso-lateral nucleus of the amygdala.
- 2.
The accumbens nucleus receives not only inputs from the amygdala via the stria terminalis but also from hippocampus, via the fimbria (AE Kelley et al. 1982).
- 3.
There are many cortical loops but none of them are as important as the amygdala: This is the case with the punishment pathway, called the PVS, periventricular system, because it involves the thalamus and the hypothalamus (plus the midbrain PAG). It is also the case with the action inhibitor pathway, called the behavioural inhibitory system (BIS), in which the noradrenergic fibres, born from the locus coeruleus, and serotoninergic fibres, born from the median raphe nuclei, are involved.
- 4.
In fMRI, one observes hyperactivation of the right amygdala and hypoactivation of the hippocampus (N Kaouane et al. 2012).
- 5.
Marcel Proust, French author (1871–1922). His primary work is called “La recherche du temps perdu” (In search of lost time) (Prix Goncourt 1919). Volume 1, “Du côté de chez Swann” (Towards at Swan), is the one in which the famous page about the memories of tea and madeleine is written!
- 6.
Deep brain stimulation (DBS) through bilateral implantation of electrodes in the nuclei accumbens has been successfully tested in cases of major depression, extremely resistant to all treatments (Th E Schlaeper et al. 2008).
- 7.
Until recently, the amygdala was considered as the receptacle for only emotions of fear or negative emotions in general. Recent work suggests that it also has a role in the receipt of positive emotions (MG Baxter and EA Murray 2002), and this role may be at least as important as the first one.
- 8.
The intense iterative stimulation of the nucleus accumbens may cause an involution of the striatum such as observed by S Kühn et al. (2014) by fMRI in young men with a habit of watching pornographic videos: The greater the stimulation (assessed in number of hours of video watching/week!), the greater the reduction of the volume of the right caudate nucleus and left putamen.
- 9.
The effect of this emotion related to fear is obvious when you see a child turn his head so as not to look, to huddle with his mother while clutching her mother’s skirt, simply because the mother asked him to say hello to the neighbour she had just met. The apprehension to an unknown face, even though female like his mother! If the mother had the misfortune to add: “this woman is going to look after you for a few hours,… while I go…”, the child’s fear could turn into panic with the fear of being abandoned, and this will involve “I don’t want to” and crying manifestations, negative emotions which are part of the amygdala.
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Di Marino, V., Etienne, Y., Niddam, M. (2016). Inputs and Outputs. In: The Amygdaloid Nuclear Complex. Springer, Cham. https://doi.org/10.1007/978-3-319-23243-0_8
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