Nail (fastener)

In woodworking and construction, a nail is a pin-shaped object of metal (or wood, called a treenail or "trunnel") which is used as a fastener, as a peg to hang something, or sometimes as a decoration. Generally nails have a sharp point on one end and a flattened head on the other, but headless nails are available. Nails are made in a great variety of forms for specialized purposes. The most common is a wire nail. Other types of nails include pins, tacks, brads, and spikes.

Nails are typically driven into the workpiece by a hammer, a pneumatic nail gun, or a small explosive charge or primer. A nail holds materials together by friction in the axial direction and shear strength laterally. The point of the nail is also sometimes bent over or clinched after driving to prevent pulling out.

History

The history of the nail is divided roughly into three distinct periods:

Nail (relic)

Relics that are claimed to be the Holy Nails with which Christ was crucified are objects of veneration among some Christians, i.e., among Catholics and the Eastern Orthodox. In Christian symbolism and art they figure among the Instruments of the Passion or Arma Christi, the objects associated with Jesus' Passion. Like the other Instruments the Holy Nails have become an object of veneration among many Christians and have been pictured in paintings and supposedly recovered.

When Helena, mother of Constantine the Great discovered the True Cross in Jerusalem, the legend was told by and repeated by Sozomen and Theodoret that the Holy Nails had been recovered too. Helena left all but a few fragments of the Cross in the Basilica of the Holy Sepulchre in Jerusalem, but returned with the nails to Constantinople. As Theodoret tells it in his Ecclesiastical History, chapter xvii,

The mother of the emperor, on learning the accomplishment of her desire, gave orders that a portion of the nails should be inserted in the royal helmet, in order that the head of her son might be preserved from the darts of his enemies. The other portion of the nails she ordered to be formed into the bridle of his horse, not only to ensure the safety of the emperor, but also to fulfil an ancient prophecy; for long before Zechariah, the prophet, had predicted that 'There shall be upon the bridles of the horses Holiness unto the Lord Almighty.

Nail (album)

Nail is the fourth studio album by Scraping Foetus Off the Wheel. It was released in October 1985, through record labels Self Immolation and Some Bizzare.

Background

The album incorporates a variety of musical genres, including classical and industrial rock, and the lyrics are often esoteric. For example, the tempo and instrumentation in "Descent into the Inferno" is infrequent: the song's first half is sparse and percussive; in the latter stages the song gathers momentum and features synthesizers. "The Overture from Pigdom Come", a composition resembling a classical piece of music, is juxtaposed with perhaps the most brutal track on the album, "Private War", a track that features one minute of various grinding noises.

There are various obscure references within the songs, some more lucid than others. "The Throne of Agony" has the lyrics "Alas, poor Yorick, I knew me well", a paraphrase of a line from Shakespeare's Hamlet (Hamlet: "Alas, poor Yorick! I knew him, Horatio..."). The line "Turn on, tune in, drop out" in "DI-1-9026" refers to the Timothy Leary phrase. Jack and the Beanstalk is also referenced, with a variation of the chant "Fee, fie, foe, fum!" appearing in the final track.

Mouth

In biological anatomy, commonly referred to as the mouth, under formal names such as the oral cavity, buccal cavity, or in Latin cavum oris, is the opening through which many animals take in food and issue vocal sounds. It is also the cavity lying at the upper end of the alimentary canal, bounded on the outside by the lips and inside by the pharynx and containing in higher vertebrates the tongue and teeth. This cavity is also known as the buccal cavity, from the Latin bucca ("cheek").

Some animal phyla, including vertebrates, have a complete digestive system, with a mouth at one end and an anus at the other. Which end forms first in ontogeny is a criterion used to classify animals into protostome and deuterostome.

Development

In the first multicellular animals there was probably no mouth or gut and food particles were engulfed by the cells on the exterior surface by a process known as endocytosis. The particles became enclosed in vacuoles into which enzymes were secreted and digestion took place intracellularly. The digestive products were absorbed into the cytoplasm and diffused into other cells. This form of digestion is used nowadays by simple organisms such as Amoeba and Paramecium and also by sponges which, despite their large size, have no mouth or gut and capture their food by endocytosis.

Mouth (hieroglyph)

The Ancient Egyptian Mouth hieroglyph is Gardiner sign listed no. D21 for the shape of the mouth, being open, (therefore also implying a use for speech). The word 'mouth' was pronounced *rāˀ.

The mouth hieroglyph is used in the Ancient Egyptian language hieroglyphs for the alphabetic consonant letter r.

The Egyptian hieroglyph alphabetic letters

The following two tables show the Egyptian uniliteral signs. (24 letters, but multiple use hieroglyphs)

See also

References

Human mouth

In human anatomy, the mouth is the first portion of the alimentary canal that receives food and saliva. The oral mucosa is the mucous membrane epithelium lining the inside of the mouth.

In addition to its primary role as the beginning of the digestive system, in humans the mouth also plays a significant role in communication. While primary aspects of the voice are produced in the throat, the tongue, lips, and jaw are also needed to produce the range of sounds included in human language.

The mouth consists of two regions, the vestibule and the oral cavity proper. The mouth, normally moist, is lined with a mucous membrane, and contains the teeth. The lips mark the transition from mucous membrane to skin, which covers most of the body.

Structure

Mouth cavity

The mouth, consists of two regions, the vestibule and the oral cavity proper. The vestibule is the area between the teeth, lips and cheeks. The oral cavity is bounded at the sides and in front by the alveolar process (containing the teeth) and at the back by the isthmus of the fauces. Its roof is formed by hard palate and soft palate and the floor is formed by the mylohyoid muscles and is occupied mainly by the tongue. Mucous membrane lines the sides and under surface of the tongue to the gum lining the inner aspect of the jaw mandible. It receives the secretions from the submaxillary and sublingual salivary glands.