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Updated: May 27, 2025
The following characteristics of the Gnathostomes are anatomic features of this kind: The internal gill-arch apparatus with the jaw arches; the pair of nostrils; the floating bladder or lungs; and the two pairs of limbs. It is inherited in rudimentary form by all of them, from the earliest fishes to man.
The anatomic architecture of the latter thymo-centric personality is fairly typical. The reversion in type of the reproductive organs, the slender waist, the gracefully formed body, the rounded limbs, the long chest and the feminine pelvis strike one at the first glance. The texture of the skin is smooth as a baby's, and sometimes velvety to the touch.
As a matter of fact, it is possible to draw such a sharp morphological distinction a distinction based on anatomic structure between the fore and hind extremity. In the formation both of the bony skeleton and of the muscles that are connected with the hand and foot before and behind there are material and constant differences; and these are found both in man and the ape.
From being a matter of wonder and hearsay, it has been demonstrated as a practical and useful method in those cases in which, by reason of some unfortunate anatomic malformation on either the male or the female side, the marriage is unfruitful. There are many cases constantly occurring in which the birth of an heir is a most desirable thing in a person's life.
This simple action, performed without thought or knowledge of the muscular processes, presents features too complex to be analyzed on the basis of mechanical law and anatomic structure. A complete analysis of the muscular operations of tone-production is absolutely impossible.
Part of these Crossopterygii approach very closely in their chief anatomic features to the Dipneusts, and thus represent phylogenetically the transition from the Devonian Ganoids to the earliest air-breathing vertebrates. This important advance was made in the Devonian period.
Unlike the artists of the anatomic school, she makes the model for herself hence the perfect correspondence of its parts. And perhaps fairer form had nature never conceived. The dullest sculptor might have been inspired by its contemplation. The costume of the girl corresponded to the cast of her features.
Each metamorphic or developmental period of life dentition, puberty, and the menopause throws a special strain on the nervous system, and the recent studies of the sympathetic nervous system at the time of the menopause show that very extensive anatomic changes occur at this time.
The third and last variety includes those cases which may be referred to some disease of the pelvic organs themselves. Anatomic changes may lead up to pathologic conditions.
The radical agreement of the lancelet and the sea-squirt in the first and most important stages of development shows something more than their close anatomic affinity and their proximity in classification; it shows also their real blood-relationship and their common origin from one and the same stem-form. In this way, it throws considerable light on the oldest roots of man's genealogical tree.
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