spindle

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Related to spindles: Muscle spindles, Sleep spindles

spindle

 [spin´d'l]
1. a pin tapered at one end or both ends, or something with this shape.
2. the thin, tapering figure occurring during metaphase of cell division, composed of microtubules radiating from the centrioles and connecting to the chromosomes at their centromeres. Called also mitotic spindle.
mitotic spindle spindle (def. 2).
muscle spindle a mechanoreceptor found between the skeletal muscle fibers; the muscle spindles are arranged in parallel with muscle fibers, and respond to passive stretch of the muscle but cease to discharge if the muscle contracts isotonically, thus signaling muscle length. The muscle spindle is the receptor responsible for the stretch or myotatic reflex.
sleep s's bursts of activity of a particular waveform in the electroencephalogram in light or early sleep.

spin·dle

(spin'dĕl),
anatomy, pathology any fusiform cell or structure.
[A.S.]

spindle

/spin·dle/ (spin´d'l)
1. a pin tapered at both ends.
2. the fusiform figure occurring during metaphase of cell division, composed of microtubules radiating from the centrioles and connecting to the chromosomes at their centromeres.
3. a type of brain wave occurring on the electroencephalogram in groups at a frequency of about 14 per second, usually while the patient is falling asleep.

Krukenberg's spindle  a spindle-shaped, brownish-red opacity of the cornea.
mitotic spindle  spindle (2).
muscle spindle  a fusiform end organ arranged in parallel between the fibers of skeletal muscle and acting as a mechanoreceptor, being the receptor of impulses responsible for the stretch reflex.
Enlarge picture
Diagrammatic cross-section of a muscle spindle showing the intrafusal fibers and afferent and efferent endings.
nuclear spindle  spindle (2).
tendon spindle  Golgi tendon organ.

spindle

(spĭn′dl)
n.
1. Biology A cytoplasmic network composed of microtubules along which the chromosomes are distributed during mitosis and meiosis.
2. Anatomy See muscle spindle.

spindle

Etymology: AS, spinel, to spin
1 the fusiform-shaped body of achromatin in the cell nucleus during the late prophase and the metaphase of mitosis. It consists of tiny fibers radiating out from the centrosomes and connecting them with one another.
2 a type of brain wave, consisting of a short series of changes in electric potential with a frequency of 14 per second.
3 any one of the special receptor organs comprising the neurotendinous and neuromuscular spindles distributed throughout the body. These kinds of spindles serve as special receptor organs that detect the degree of stretch in a muscle or at the junction of a muscle with its tendon and are essential in maintaining muscle tone.

spin·dle

(spin'dĕl)
anatomy, pathology Any fusiform cell or structure.
[A.S.]

spindle

A term used adjectivally in anatomy and referring to any elongated cell or structure pointed at both ends. Fusiform.

spin·dle

(spin'dĕl)
In anatomy and pathology, any fusiform cell or structure.
[A.S.]

spindle,

n muscle, a fusiform body lying parallel to and between muscle fibers. It is composed of a conspicuously smaller modified muscle fiber that has its own motor end plate to cause it to contract and its own special sensory end organs (the flower spray ending and the anulospiral ending) that send information to the central nervous system regarding the state of contraction of the main muscle body.

spindle

1. mitotic spindle; the fusiform figure occurring during metaphase of cell division, composed of microtubules radiating from the centrioles and connecting to the chromosomes at their centromeres.
2. muscle spindle.

muscle spindle
a mechanoreceptor found within a skeletal muscle; the muscle spindles are arranged in parallel with muscle fibers. They contain three to 10 small, striated muscle fibers (intrafusal fibers) contained within a capsule and supplied with specialized motor and sensory nerves. They respond to passive stretch of the muscle but cease to discharge if the muscle contracts isotonically, thus signalling muscle length. The muscle spindle is the receptor responsible for the stretch or myotatic reflex.
spindle wood, spindle tree
euonymuseuropaea.
References in classic literature ?
Then the twelfth of the friendly fairies, who had not yet given her gift, came forward, and said that the evil wish must be fulfilled, but that she could soften its mischief; so her gift was, that the king's daughter, when the spindle wounded her, should not really die, but should only fall asleep for a hundred years.
said the princess, and took the spindle and began to try and spin.
While they were talking, Robin had been nimbly changing clothes with the old woman, through the window, and in a jiffy he stood forth complete, even to the spindle and twine.
The crone was hobbling along with difficulty, leaning heavily upon a gnarled stick and bearing the spindle on her other arm.
Kaliko ran out as fast as his spindle legs could carry his fat, round body, and soon the Chief Counselor entered the cavern.
To their astonishment they beheld a small round table running as fast as its four spindle legs could carry it, and to the top was screwed fast a phonograph with a big gold horn.
Pursued by two very active young men armed with fire-hardened spears, tottering along with incredible swiftness on his two spindle legs, Kwaque had fallen exhausted at Daughtry's feet and looked up at him with the beseeching eyes of a deer fleeing from the hounds.
I shall be shut up with the tire-women else, and have a week of spindle and bodkin, when I would fain be galloping Troubadour up Wilverley Walk, or loosing little Roland at the Vinney Ridge herons.
A table, with four spindle legs, stood in the room; the doctor drew it up to the bed, found a tumbler and a phial on the mantel-shelf, and composed a draught, by carefully measuring a few drops of brown liquid from the phial into some water, Genestas holding the light the while.
From these ends is extended the spindle of Necessity, on which all the revolutions turn.
A basket I could not make by any means, having no such things as twigs that would bend to make wicker-ware - at least, none yet found out; and as to a wheelbarrow, I fancied I could make all but the wheel; but that I had no notion of; neither did I know how to go about it; besides, I had no possible way to make the iron gudgeons for the spindle or axis of the wheel to run in; so I gave it over, and so, for carrying away the earth which I dug out of the cave, I made me a thing like a hod which the labourers carry mortar in when they serve the bricklayers.
Tenders are invited for 1)Tools For 4 Spindles Of T-Block Milling M/C For 51 Mm Block Size, One Horizontal Axis & Two Vertical Axis, First Spindle Vertical Axis : For Corner Rounding & Slot, O/D : 127 Mm, I/D : 40 Mm, No.