ansa

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ansa

 [an´sah] (pl. an´sae) (L.)
a looplike structure.
ansa cervica´lis a nerve loop in the neck attached in front and above to the hypoglossal nerve and behind to the upper cervical spinal nerves. Its hypoglossal attachment is misleading since this part of the loop ultimately rejoins the upper spinal nerves. Called also ansa hypoglossi.
ansa of Henle Henle's loop.
ansa hypoglos´si ansa cervicalis.
ansa lenticula´ris a small nerve fiber tract arising in the globus pallidus and joining the anterior part of the ventral thalamic nucleus.
ansa nephro´ni Henle's loop.
an´sae nervo´rum spina´lium loops of spinal nerves joining the anterior spinal nerves.
ansa peduncula´ris peduncular loop: a complex grouping of nerve fibers connecting the amygdaloid nucleus, piriform area, and anterior hypothalamus, and various thalamic nuclei.

an·sa

, gen. and pl.

an·sae

(an'să, -sē), [TA]
Any anatomic structure in the form of a loop or arc.
See also: loop.
[L. loop, handle]

ansa

/an·sa/ (an´sah) pl. an´sae   [L.] a looplike structure.
ansa cervica´lis  a nerve loop in the neck that supplies the infrahyoid muscles.
ansa lenticula´ris  a small nerve fiber tract arising in the globus pallidus and joining the anterior part of the ventral thalamic nucleus.
ansa nephro´ni  loop of Henle.
an´sae nervo´rum spina´lium  loops of nerve fibers joining the ventral roots of the spinal nerves.
ansa peduncula´ris  peduncular loop; a complex grouping of nerve fibers connecting the amygdaloid nucleus, piriform area, and anterior hypothalamus, and various thalamic nuclei.
ansa subcla´via , ansa of Vieussens the subclavian loop; nerve filaments passing around the subclavian artery to form a loop connecting the middle and inferior cervical ganglia.
ansa vitelli´na  an embryonic vein from the yolk sac to the umbilical vein.

ansa

[an′sə,] pl. ansae
Etymology: L, handle
(in anatomy) a looplike structure resembling a curved handle of a vase.

an·sa

, pl. ansae (an'să, -sē) [TA]
Any anatomic structure in the form of a loop or an arc.
See also: loop
[L. loop, handle]

ansa

An anatomical structure, especially neurological, in the form of a loop or arc. From the Latin ansa , the handle of a jug.

ansa

pl. ansae [L.] a looplike structure.

ansa axillaris
a loop between the musculocutaneous nerve and the median nerve.
ansa cardiaca
a loop of muscle that passes around the dorsal margin of the cardia and forms the margins of the reticular groove in ruminants. It is an essential part of the closing of the cardia.
ansa cervicalis
a nerve loop attached to the hypoglossal nerve and to the first two or three cervical spinal nerves.
ansa coli
the loops of the colon including the distal, proximal and spiral loops.
ansa distalis
a loop of the colon of ruminants that succeeds the spiral colon.
ansa of Henle
Henle's loop.
ansa hypoglossi
ansa cervicalis.
ansa lenticularis
a loop of nerve fibers that connects the globus pallidus with parts of the thalamus and midbrain.
ansa nervorum spinalium
loops of spinal nerves joining the ventral spinal nerves.
ansa peduncularis
a complex grouping of nerve fibers connecting the amygdaloid nucleus, piriform area, and anterior hypothalamus, and various thalamic nuclei.
ansa proximalis
a loop of the colon of ruminants that precedes the spiral colon.
ansa sigmoidea
the s-shaped curve of the proximal duodenum as it passes over the visceral surface of the liver of the horse, ruminants and pig.
ansa spiralis
the double loop of colon made up of centripetal and centrifugal coils and a central flexure that run in a vertical plane in ruminants and in a snail-like coil in pigs.
ansa subclavia
the loop made by the cervical sympathetic trunk as it divides to pass on either side of the subclavian artery at the thoracic inlet.
References in periodicals archive ?
On May 15, two days before the Sun crossed the ringplane, Struve found: 'The line of ansae perfectly well visible.
A first glance at Fournier's drawing had convinced him that such a feature in terms of perspective would scarcely be visible at the oblique viewing angle that prevailed at the time of observation; unless that is, the 'new' ring extended in the ansae for a considerable distance beyond the extremities of Ring A.
Now at eleven o'clock on the night of October 5 in seeing conditions that justified an increase in magnification, he could trace the band as it skirted the outer edge of the bright rings to well beyond the confines of the globe, and out to the limits of Cassini's division in the ansae, until at last it was lost in the glare from the rings.
This evening,' he wrote, 'I could certainly see the dark exterior ring as far as the ansae of the Cassini Division and for a moment perhaps up to the east and west extremity of the bright rings.
When the image is very tranquil, the upper band extends beyond the globe of Saturn and at a greater distance forms the ansae of the Crape Ring.
du Martheray saw the ring in 1952-1953 but only as a narrow shading bordering the edge of Ring A in projection against the globe, not in the ansae.
At 21h 15m UT the nebulous aspect showed feebly but distinctly as a dusky fringe at the following and preceding ansae and some distance inwards towards the globe, but could not be satisfactorily resolved where the ring crossed the globe.
Curiously, Davis's October 8th image captures the anomalous colors near the ansae, but in his December 20th image and Di Sciullo's January 20th image, the red-blue disparity is not oriented east to west but north to south, symmetrical with respect to a line connecting Saturn and the Sun.
This feature, he noted, was fainter than ring C (the so-called crepe ring, discovered in 1850) and seldom equally prominent in both ansae.
Unless the Crepe Ring is reasonably easy at the ansae," he cautioned prospective observers, "the dusky ring outside of Ring A will probably be invisible.
Despite this powerful visual cue, Herschel failed to follow the outline of this feature off the globe and into the ansae of the rings.
Saturn's dusky C ring was visible in the inner ansae of the rings and crossing the planet's disk.