By Ricardo Insausti
The postnatal improvement of the human hippocampal formation (HF) is topic of accelerating curiosity because of its implication in very important pathologies that abate the traditional improvement of kids. during this paintings, the authors current a glimpse of the most occasions that represent vital milestones within the improvement and shaping of a few of an important mental services akin to autobiographical reminiscence. even supposing they tested a few circumstances within the final trimester of gestation, their description starts off at start, round forty gestational weeks. Serial sections with thionin for Nissl research printed that each one fields of the HF have been current and identifiable at start. even though, the relative development of the cortical mantle was once a lot larger relative to the HF. the most structural adjustments happened through the first postnatal yr, specifically within the dentate gyrus and within the entorhinal cortex. At next a long time, a development in dimension used to be famous in all parts of the HF. This development was once extra glaring on the physique and tail of the hippocampus, as evidenced via measurements of the neuroanatomical sequence. furthermore, the authors tested often times the MRI visual appeal of the HF at varied postnatal a while got via autopsy imaging. MRI neuroanatomical sequence supplied anatomically pointed out landmarks valuable for the MRI id of alternative elements of the HF in the course of postnatal development.
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Extra info for Postnatal Development of the Human Hippocampal Formation
An additional possibility is that the growth and ramification of the granule cell dendritic tree contributes significantly to the subgranular space brought about by the basal dendrites of granule cells, a specific trait of human and nonhuman primates (Seress and Mrzljak 1987). 38 CA3 Studies in the monkey indicate that the arborization of the dendritic tree of granule cells (Seress 2001; Seress and Ribak 1995a, b), an external indicator of maturation, takes place during the first six postnatal months, a time when the dendritic tree is comparable in appearance and length to one and three year old monkeys (Duffy and Rakic 1983).
D shows the midportion of the hippocampal body. Scale bar equals 4 mm 22 Fig. 7 (continued) Gross Anatomical Landmarks Gross Anatomical Landmarks 23 Fig. 7 Series of low-power photomicrographs showing coronal sections through the HF in a 14 year old case. The rostralmost section (a) is at the level of the amygdaloid complex; it also shows the rostral level of the EC with an incipient gyrus ambiens (GA) as well as the characteristic indentation of the intrarhinal sulcus (irs); in this case, a shallow collateral 24 Gross Anatomical Landmarks further medially, two small protrusions are present: the more medial of the two is the fasciola cinerea (caudal end of the DG) and the more lateral is the gyrus fasciolaris (end of CA3, not shown).
The transition between CA1 and the subiculum forms an oblique border that is hardly seen at birth (a) but becomes progressively more apparent at one year old (b), five years old (c), and 14 years old (d). The deepest layer of the subiculum, the polymorphic layer, is inconspicuous at this magnification. Scale bar is 1 mm Presubiculum Fig. 8 (continued) 49 50 Presubiculum Fig. 8 Series of photomicrographs of the presubiculum in the newborn (a), one year old (b), five year old (c), and 14 year old (d) cases.
Postnatal Development of the Human Hippocampal Formation by Ricardo Insausti