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1

Assuming the case where you move a mouse left and right with the wrist and up and down with the fingers, then yes, finger movements are more precise. The fingers and facial musculature are body parts with the most exquisite fine motor-control. The wrist, on the other hand, probably less so. The wrist is definitely involved in fine motor skills such as ...


2

Note that estimations in this answer are very very crude. I can speak with confidence that the mean pressure of ankel joint is greater than the heel and the metatarsus. However I do not trust that it can pin down the point with most pressure. @Ilan gave a very good synopsis on foot pressure distribution. However, pressure in ankles was not analyzed in his ...


5

It is logically clear that the ankle could only partly be analyzed in the group of joints that are below its height. There is no direct way to measure the pressure on ankle joint (on talus bone), but from the logic it is clear that it should be the point of highest pressure in the group of points lister in the question, however the pressure is distributed ...


-1

kmm gives what is likely the best possible answer, as it is argued from causality rather than teleology. As my ninth grade biology teacher used to say, "there is no 'why' in biology, only 'how'". On the other hand, it is fun to speculate! Here's my two cents in the form of a Bad ad hoc Hypothesis: Holes going into the body are an expensive and risky ...


0

I would just modify the excellent previous by pointing out that the embryology describes a local maxima of fitness whose barrier to change is higher than any selective pressure. The re-use of the "logic" of the intermediate mesoderm was either initially a bifurcation from one or the other, or, was of enough selective advantage to have the two developmental ...


9

Developmentally, the urinary and genital systems (typically you will hear them referred to as "urogenital system") are derived from the same embryonic tissue, the intermediate mesoderm. The embryonic kidneys are drained by the mesonephric duct in both females and males. This embryonic tissue also gives rise to the ovaries and testes. The mesonephric duct ...


4

I have some insight into this from an engineering perspective. Years ago, I worked on some computational and search algorithms which used a growth factor to determine how far to widen a search space, or how much more memory to allocate. For some of these algorithms, I ran a series of random trials to search for an optimal growth factor and found that for ...


4

Short answer Oxytocin release has been associated with the cutaneous low-threshold (CT) afferent fibers in hairy skin. Background Oxytocin is released from the paraventricular nucleus in the brain in response to low intensity stimulation of the skin, such as touch, stroking and warm temperatures. In a recent review Uvnäs-Moberg et al. (2015) report that ...



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