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The comparative anatomy of these fins is very interesting, because they contain the rudiments of all the skeletal parts that form the framework of the fore and hind legs in all the higher vertebrates right up to man. There is no trace of these pairs of limbs in the Acrania and Cyclostomes.
This is not so, for like the adult fish, the larval tadpole, and the embryo chick, an embryo of a cat or a man is at one time constructed with a series of gill-clefts and with blood-vessels and skeletal supports of fishlike nature that are everywhere associated with gills.
We would hardly expect to find remains of ancient microscopic animals like the protozoa, unless they possessed shells or other skeletal structures which in their aggregate might form masses like the chalk beds of Europe.
Shelton said that cleansing is not complete until a skeletal condition is reached that is, absolutely no fat reserves are left.
These latter are slower to act when stimulated, contract more slowly, and cease to function more tardily when the stimulus is withdrawn. The muscular mechanisms used by the singer and speaker are of the skeletal variety.
The spinal nerves have two roots, superior and inferior. The superior is the sensory root and the inferior is the motor root, both uniting to form a mixed nerve trunk. The sensory root possesses a ganglion from which it originates. Generally speaking, the cerebrospinal system deals with the special senses, movement of skeletal or voluntary muscles and cutaneous and muscular sensations.
It should also be borne in mind that the correction of skeletal deformities requires effort through a long period of time, especially where the deformities are pronounced; and one lacking the will power to persist will not secure all the results which he seeks.
Sam Collins flashed the undertaker a healthy smile, hoping it wouldn't depress old Candle too much. He saluted. The skeletal figure in endless black nodded gravely, and took hold of Sam Collins' arm with a death grip. "I'm going to bury you, Sam Collins," the undertaker said.
*Correction of Skeletal Deformities.*—It is, of course, easier to prevent deformities of the skeleton by giving attention to proper positions, than to correct them after they have occurred. It should also be noted that severe deformities cannot be corrected by the individual for himself, but these must come under the treatment of specialists in this line of medical work.
But this unsegmented primary axial skeleton is soon replaced by the segmented secondary axial skeleton, which we know as the vertebral column. In the head-half of the embryo the skeletal plate remains a continuous, simple, undivided layer of tissue, and presently enlarges into a thin-walled capsule enclosing the brain, the primordial skull.
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