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The Collaborative International Dictionary
Pons

Pons \Pons\, n.; pl. Pontes. [L., a bridge.] (Anat.) A bridge; -- applied to several parts which connect others, but especially to the pons Varolii, a prominent band of nervous tissue situated on the ventral side of the medulla oblongata and connected at each side with the hemispheres of the cerebellum; the mesocephalon. See Brain.

Pons asinorum. [L., literally, bridge of asses.] See Asses' bridge, under Ass.

Douglas Harper's Etymology Dictionary
pons

"bridge," in various Latin expressions, from Latin pons "bridge, connecting gallery, walkway," earlier probably "way, passage," from PIE *pent- "to go, tread" (see find (v.)). Especially pons asinorum "bridge of asses," nickname for the fifth proposition of the first book of Euclid, which beginners and slow wits find difficulty in "getting over": if two sides of a triangle are equal, the angles opposite these sides also are equal.

Wiktionary
pons

n. 1 (context anatomy English) A bridge-like tissue connecting two parts of an organ 2 (context anatomy English) A band of nerve fibres, the pons Varolii, within the brain stem

WordNet
pons
  1. n. a band of nerve fibers linking the medulla oblongata and the cerebellum with the midbrain [syn: pons Varolii]

  2. [also: pontes (pl)]

Wikipedia
Pons

The pons is part of the brainstem, and in humans and other bipeds lies between the midbrain (above) and the medulla oblongata (below) and in front of the cerebellum.

The pons is also called the pons Varolii ("bridge of Varolius"), after the Italian anatomist and surgeon Costanzo Varolio (1543–75). This region of the brainstem includes neural pathways or tracts that conduct signals from the brain down to the cerebellum and medulla, and tracts that carry the sensory signals up into the thalamus.

The pons in humans measures about in length. Most of it appears as a broad anterior bulge rostral to the medulla. Posteriorly, it consists mainly of two pairs of thick stalks called cerebellar peduncles. They connect the cerebellum to the pons and midbrain.

The pons contains nuclei that relay signals from the forebrain to the cerebellum, along with nuclei that deal primarily with sleep, respiration, swallowing, bladder control, hearing, equilibrium, taste, eye movement, facial expressions, facial sensation, and posture.

Within the pons is the pneumotaxic center consisting of the subparabrachial and the medial parabrachial nuclei. This center regulates the change from inhalation to exhalation.

The pons is implicated in sleep paralysis, and also plays a role in generating dreams.

Pons (crater)

Pons is an lunar crater that is located to the west of the prominent Rupes Altai scarp. It lies to the southeast of the crater Sacrobosco, and southwest of Polybius. To the northwest along the same flank of the formation is the crater Fermat.

The rim of Pons is somewhat elongated in shape, being longer along a northeast-southwest axis than in the perpendicular direction. The outer wall is irregular and notched, particularly at the northeastern end where it is partly overlain by the satellite crater Pons D and multiple smaller formations. The interior is uneven, with low ridges projecting from the north and southeastern rims.

Pons (disambiguation)

The pons (or pons Varolii; "bridge of Varolius") is a knob on the brain stem.

Pons or pons may also refer to:

  • Pons, a junior synonym of the butterfly genus Penaincisalia
  • Passive optical network, a telecommunications term
  • Polish Lowland Sheepdog, from the Polish Polski Owczarek Nizinny, a type of sheepdog

Usage examples of "pons".

This axiom evidently expresses the symmetry of perpendicularity, and is the essence of the famous pons asinorum expressed as an axiom.

Pons was rarely called on to game with his dynast, who had little patience with the unskilled.

This mixed nerve arises in the medulla, near its junction with the pons, and innervates the mucous membrane of the rear of the tongue and of the throat.

Pons Sublicius, the oldest of the bridges spanning the Tiber at the city of Rome.

I was enabled to shake the hands of Edgar Quinet, of Chauffour, of Clement Dulac, of Bancel, of Versigny, of Emile Pean, and I again met our energetic and honest host of the Rue Blanche, Coppens, and our courageous colleague, Pons Stande, whom we had lost sight of in the smoke of the battle.

At that very moment the indefatigable representative of the firm of Sonet came up, and, closely following him, the man who remembered Pons and thought of paying him a last tribute of respect.

The uppermost connects it with the midbrain, the next with the pons, and the lowermost with the medulla oblongata.

For instance, the rate of salivary secretion is controlled by certain cells in the upper medulla and the lower pons.

It arises from the pons a little before its junction with the medulla and leads to the external rectus muscle of the eyeball.

Pons happened to meet Palissy, and finding that the same subjects interested them both, he showed him the cup.

The notary, inquiring for Pons, was shown upstairs by the portress of a neighboring house.

But without some sketch of the Presidente, it is impossible fully to understand the perturbation of heart from which Pons suffered.

While Pons was casting about for the complimentary answer which invariably occurred to him too late when he was afraid of his host, Madeleine came in, handed a folded note to the Presidente, and waited for an answer.

Madeleine had no sooner left the room than the Presidente turned to Cousin Pons with that insincere friendliness which is about as grateful to a sensitive soul as a mixture of milk and vinegar to the palate of an epicure.

Pons, thus reached on his weak side, again plunged into formulas more than polite, and went as far as the stairhead with the President.