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Sheath
Sheath pronounced as , may refer to: * Scabbard, a sheath for holding a sword, knife, or other large blade, as well as guns, such as rifles. * The outer covering of a cable * Condom, a kind of contraception * Debye sheath, a layer of a plasma in physics * Heliosheath, the region of the heliosphere beyond the termination shock * Koteka, a penis sheath worn by some natives of New Guinea * ''Sheath'' (album), a 2003 techno album by LFO * Sheath dress, a type of dress * Kosha, an element in human being makeup according to Hinduist philosophy Botany * Leaf sheath, the leaf base when it forms a vertical coating surrounding the stem Anatomy * Carotid sheath, connective tissue around the neck's vascular compartment * Myelin sheath, an insulating layer over the axon of a neuron * Preputial sheath, protective skin around the penis or clitoris ** Clitoral hood ** Penile sheath, the foreskin into which a penis retracts * Rectus sheath, the laminas around abdominal muscles * Root sheath, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Penile Sheath
Almost all mammal penises have foreskins or prepuce, although in non-human cases the foreskin is usually a sheath (sometimes called the ''preputial sheath'', ''praeputium'' or ''penile sheath'') into which the whole penis is retracted. In koalas, the foreskin contains naturally occurring bacteria that play an important role in fertilization. In some bat species, the prepuce contains an erectile tissue structure called the ''accessory corpus cavernosus''. During musth, a male elephant may urinate with the penis still in the sheath, which causes the urine to spray on the hind legs.Sukumar, pp. 100–08. Male dogs have a conspicuous penis sheath. In stallions, the retractor penis muscle contracts to retract the stallion's penis into the sheath and relaxes to allow the penis to extend from the sheath. The penis sheath of a male axis deer is elongated and urine-stained. When rubbing trees with their horns, these stags sometimes move the penis back and forth rapidly inside its she ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Debye Sheath
The Debye sheath (also electrostatic sheath) is a layer in a plasma which has a greater density of positive ions, and hence an overall excess positive charge, that balances an opposite negative charge on the surface of a material with which it is in contact. The thickness of such a layer is several Debye lengths thick, a value whose size depends on various characteristics of plasma (e.g. temperature, density, etc.). A Debye sheath arises in a plasma because the electrons usually have a temperature on the order of magnitude or greater than that of the ions and are much lighter. Consequently, they are faster than the ions by at least a factor of \sqrt. At the interface to a material surface, therefore, the electrons will fly out of the plasma, charging the surface negative relative to the bulk plasma. Due to Debye shielding, the scale length of the transition region will be the Debye length \lambda_\mathrm. As the potential increases, more and more electrons are reflected by the sheath ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kosha
A ''kosha'' (also ''kosa''; Sanskrit कोश, IAST: ), usually rendered "sheath", is a covering of the ''Atman'', or Self according to Vedantic philosophy. There are five ''koshas'' (Panchakoshas; ; the five sheaths), and they are often visualised as the layers of an onion in the subtle body. The ''Tvam'' ("Thou") ''padartha'' of the ''Mahavakya'' ''Tat Tvam Asi'' is determined by the analysis of ''Panchakoshas'' that are not the ''atman''. ''Panchakoshas'' are discussed in the ''Brahmanandavalli'' Chapter of Taittiriya Upanishad which is a part of the Taittiriya Samhita of the Krishna Yajur Veda and in which particular chapter is discussed ways and means to achieve Brahman. It gives a detailed description of the dimensions of human personality or the dimensions of the Self. Atman The '' Sruti'' declares that human birth, by divine grace, is meant to strive to know and understand the ''atman''. The knowledge and understanding of the ''atman'' invariably results in ''Jiwan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sheath Dress
In fashion, a sheath dress is a fitted, straight cut dress, often nipped at the waistline with no waist seam. When constructing the dress, the bodice and skirt are joined together by combining the skirt darts into one dart: this aligns the skirt darts with the bodice waist dart. The dress emphasizes the waist as its skirt portion is fitted. While the sheath dress can come in many patterns and lengths, it often is worn with short sleeves and reaches knee length. Ancient Egypt Originating in the ancient world, the sheath dress is commonly seen in Egyptian art. Presented as slender and youthful, artistic renditions of the women in the garment were common prior to the New Kingdom. Although there was no archeological evidence of a sheath dress among the elite, women and deities are shown wearing the garment in tomb drawings. The garment was often presented with a seam under the breast and with beads. Ancient depictions of elite women showed the dress paired with the tripartite wig and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myelin Sheath
Myelin is a lipid-rich material that surrounds nerve cell axons (the nervous system's "wires") to insulate them and increase the rate at which electrical impulses (called action potentials) are passed along the axon. The myelinated axon can be likened to an electrical wire (the axon) with insulating material (myelin) around it. However, unlike the plastic covering on an electrical wire, myelin does not form a single long sheath over the entire length of the axon. Rather, myelin sheaths the nerve in segments: in general, each axon is encased with multiple long myelinated sections with short gaps in between called nodes of Ranvier. Myelin is formed in the central nervous system (CNS; brain, spinal cord and optic nerve) by glial cells called oligodendrocytes and in the peripheral nervous system (PNS) by glial cells called Schwann cells. In the CNS, axons carry electrical signals from one nerve cell body to another. In the PNS, axons carry signals to muscles and glands or from sensor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heliosheath
The heliosphere is the magnetosphere, astrosphere and outermost atmospheric layer of the Sun. It takes the shape of a vast, bubble-like region of space. In plasma physics terms, it is the cavity formed by the Sun in the surrounding interstellar medium. The "bubble" of the heliosphere is continuously "inflated" by plasma originating from the Sun, known as the solar wind. Outside the heliosphere, this solar plasma gives way to the interstellar plasma permeating the Milky Way. As part of the interplanetary magnetic field, the heliosphere shields the Solar System from significant amounts of cosmic ionizing radiation; uncharged gamma rays are, however, not affected. Its name was likely coined by Alexander J. Dessler, who is credited with first use of the word in scientific literature in 1967. The scientific study of the heliosphere is heliophysics, which includes space weather and space climate. Flowing unimpeded through the Solar System for billions of kilometres, the solar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carotid Sheath
The carotid sheath is an anatomical term for the fibrous connective tissue that surrounds the vascular compartment of the neck. It is part of the deep cervical fascia of the neck, below the superficial cervical fascia meaning the subcutaneous adipose tissue immediately beneath the skin. The deep cervical fascia of the neck includes four parts: * The investing layer (encloses the SCM and Trapezius) * The carotid sheath (encloses the vascular region of the neck) * The pretracheal fascia (encloses the visceral region of the neck) * The prevertebral fascia (encloses the vertebral region of the neck) Structure The carotid sheath is located at the lateral boundary of the retropharyngeal space at the level of the oropharynx on each side of the neck and deep to the sternocleidomastoid muscle. It extends from the base of the skull to the first rib and sternum, varying between C7 and T4. It merges with the axillary sheath when it reaches the subclavian vein. Contents The four major stru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rectus Sheath
The rectus sheath, also called the rectus fascia,. is formed by the aponeuroses of the transverse abdominal and the internal and external oblique muscles. It contains the rectus abdominis and pyramidalis muscles. Structure The rectus sheath can be divided into anterior and posterior laminae. The arrangement of the layers has important variations at different locations in the body. Below the costal margin For context, above the sheath are the following two layers: # Camper's fascia (anterior part of Superficial fascia) # Scarpa's fascia (posterior part of the Superficial fascia) Within the sheath, the layers vary: Below the sheath are the following three layers: # transversalis fascia # extraperitoneal fat # parietal peritoneum The rectus, in the situation where its sheath is deficient below, is separated from the peritoneum only by the transversalis fascia, in contrast to the upper layers, where part of the internal oblique also runs beneath the rectus. Because of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Root Sheath (hair)
The inner or epidermic coat of the hair follicle is closely adherent to the root of the hair, and consists of two strata named respectively the outer and inner root sheaths. Outer root sheath The outer root sheath corresponds with the stratum mucosum (stratum germinativum and stratum spinosum) of the epidermis, and resembles it in the rounded form and soft character of its cells; at the bottom of the hair follicle these cells become continuous with those of the root of the hair. Inner root sheath The inner root sheath (IRS) consists of # a delicate cuticle next the hair, composed of a single layer of imbricated scales with atrophied nuclei; # Huxley's layer # Henle's layer Henle's layer is the third and the outermost layer of the inner root sheath of the hair follicle, consisting of a single layer of cubical cells with clear flattened nuclei. It is named after German physician, pathologist and anatomist A ... The term "trichilemmal" refers to the outer root she ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Koteka
The koteka, also referred to as a horim or penis gourd, is a penis sheath traditionally worn by native male inhabitants of some (mainly highland) ethnic groups in New Guinea, Indonesia to cover their penises. The koteka is normally made from a dried-out gourd, ''Lagenaria siceraria'', although unrelated species such as pitcher-plant (''Nepenthes mirabilis'') are also used. The koteka is held in place by a small loop of fiber attached to the base of the koteka and placed around the scrotum. A secondary loop placed around the chest or abdomen is attached to the main body of the koteka. Men choose kotekas similar to ones worn by other men in their respective cultural groups. For example, Yali men favour long, thin kotekas that help hold up the multiple rattan hoops worn around their waists, whereas men from Tiom wear double gourds held up with strips of cloth and use the space between the two gourds for carrying small items such as money and tobacco. Traditions The koteka is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sheath (album)
''Sheath'' is the third and final studio album by British IDM project LFO. It was released by Warp on 22 September 2003. It peaked at number 27 on the UK Independent Albums Chart. Critical reception At Metacritic, which assigns a weighted average score out of 100 to reviews from mainstream critics, ''Sheath'' received an average score of 73% based on 13 reviews, indicating "generally favorable reviews". John Bush of AllMusic gave the album 4 stars out of 5 and called Mark Bell "the most imaginative producer in British techno." Dominique Leone of ''Pitchfork'' gave the album a 7.3 out of 10, writing, "Bell's strength seems to reside in his softer sides that fools me into thinking his more extroverted outings are lacking." Paul Sullivan of BBC #REDIRECT BBC #REDIRECT BBC Here i going to introduce about the best teacher of my life b BALAJI sir. He is the precious gift that I got befor 2yrs . How has helped and thought all the concept and made my success in the 10th board exam. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tendon Sheath
A tendon sheath is a layer of synovial membrane around a tendon. It permits the tendon to stretch and not adhere to the surrounding fascia. It has two layers: * synovial sheath A synovial sheath is one of the two membranes of a tendon sheath which covers a tendon. The other membrane is the outer fibrous tendon sheath. The tendon invaginates the synovial sheath from one side so that the tendon is suspended from the membra ... * fibrous tendon sheath Fibroma of the tendon sheath has been described. References Musculoskeletal system {{anatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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