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Updated: June 11, 2025
Immediately under the thin corium, and closely connected with it, we find a thin muscle tube, as in the worms. On the other hand, the Ascidia has a centralised heart, and in this respect it seems to be more advanced than the Amphioxus. On the ventral side of the gut, some distance behind the gill-crate, there is a spindle-shaped heart.
The microscope shows these muscles to consist not of fibers, but of long spindle-shaped cells, united to form sheets or bands. They have no sarcolemma, stripes, or cross markings like those of the voluntary muscles. Hence their name of non-striated, or unstriped, and smooth muscles. The involuntary muscles respond to irritation much less rapidly than do the voluntary.
The mangrove is maritime. While still pendant from the pear-shaped fruit of the parent tree, the seed, a spindle-shaped radicle, varying in length from a foot to 4 feet, germinates ready to form a plant immediately upon arrival at a suitable locality. A sharp spike at the apex represents the embryo leaves ready to unfold, while the roots spring from the opposite and slightly heavier end.
Some are long and spindle-shaped, others thin and broad, while still others form rings. Thus some of the muscles of the arm and thigh are long and tapering, while the abdominal muscles are thin and broad because they help form walls for cavities.
We saw that the palingenetic form of the heart is a spindle-shaped thickening of the gut-fibre layer in the ventral wall of the head-gut. The structure is then hollowed out, forms a simple tube, detaches from its place of origin, and henceforth lies freely in the cardiac cavity.
The neck, or cervix, is somewhat spindle-shaped, and has a canal running through its center which opens by a small aperture the so-called external orifice, into the vagina. In the virgin uterus the apposition of the anterior and posterior walls reduces the cavity to little more than a longitudinal cleft. With the advent of old age the whole organ suffers marked atrophy.
Its tongue, also of horn substance and armed with several rows of sharp teeth, would flicker out from between these genuine shears. What a freak of nature! A bird's beak on a mollusk! Its body was spindle-shaped and swollen in the middle, a fleshy mass that must have weighed 20,000 to 25,000 kilograms.
I climbed its metal steps, passed through the open hatches, and arrived topside on the Nautilus. The platform emerged only eighty centimeters above the waves. The Nautilus's bow and stern boasted that spindle-shaped outline that had caused the ship to be compared appropriately to a long cigar.
But who could trouble over Coralie's psychology when his eyes were dazzled by those smooth, round arms of hers, the spindle-shaped fingers, the fair white shoulders, and breast celebrated in the Song of Songs, the flexible curving lines of throat, the graciously moulded outlines beneath the scarlet silk stockings?
The transformation of this temporary granulation tissue into scar tissue is effected by the fibroblasts, which become elongated and spindle-shaped, and produce in and around them a fine fibrillated material which gradually increases in quantity till it replaces the cell protoplasm.
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