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The archosaurian shift from larynx to syrinx must have conferred a selective advantage for crown birds, but the causes for this shift remain unknown. [10] To complicate matters, the syrinx falls into an unusual category of functional evolution: arising from ancestors with a larynx-based sound source, the syrinx contains significant functional overlap with the structure it replaced.
However, this theory has been refuted by studies of egg shell formation in a number of bird species using techniques such as X-ray photography [14] [15] which have demonstrated that egg shape is determined in the oviduct isthmus (before shell calcification) with the pointed end caudal (furthest down the oviduct). These observations cannot be ...
Adult neurogenesis is the process in which new neurons are born and subsequently integrate into functional brain circuits after birth and into adulthood. Avian species including songbirds are among vertebrate species that demonstrate particularly robust adult neurogenesis throughout their telencephalon, in contrast with the more limited neurogenic potential that are observed in adult mammals ...
HVC is located in the caudal nidopallium.It projects to the song motor pathway via the robust nucleus of the arcopallium (RA) and to the Anterior Forebrain Pathway via the basal ganglia nucleus Area X. [1] It receives recurrent motor activity through the thalamic nucleus Uvaformis (Uva) and input from the auditory system through projections from the caudalateral mesopallium (CMM) and through ...
Spirit Airlines stock plunged 59% on Wednesday as the budget airline explores a deal with creditors to restructure its debt amid a reported threat of bankruptcy after merger talks with Frontier ...
Where to Get Ketoconazole Shampoo. You can get 1% or less ketoconazole shampoo over the counter at your local drug store or supermarket. Look out for certain products advertised as dandruff ...
Avian hair cells remain in a quiescent state even before birth, meaning that they are in a mitotic rest stage and do not replicate. [21] Hair cells are only regenerated after damage. [ 21 ] Hair cells in chicks are regenerated just three days after damage is inflicted, and the hair cells fully recover within 30 days. [ 22 ]
Donald Trump mocked Canadian Prime Minister Justin Trudeau after his top minister’s surprise resignation following a clash on how to handle the president-elect’s looming tariffs.
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