Sheath, pronounced , may refer to: *

Scabbard A scabbard is a sheath for holding a sword, dagger, knife, or similar edged weapons. Rifles and other long guns may also be stored in scabbards by horse riders for transportation. Military cavalry and cowboys had scabbards for their saddle ring ...

, a sheath for holding a sword, dagger, knife, or similar edged weapons, as well as long guns, such as rifles and shotguns. * The outer covering of an

electrical cable Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwel ...

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 ...

, a layer of a plasma in physics *

Heliosheath The heliosphere is the magnetosphere, astrosphere, and outermost atmospheric layer of the Sun. It takes the shape of a vast, tailed bubble-like region of space. In plasma physics terms, it is the cavity formed by the Sun in the surrounding in ...

, the region of the heliosphere beyond the termination shock *

Kosha A ''kosha'' (also ''kosa''; Sanskrit :wikt:कोश, कोश, IAST: ), usually rendered "sheath", is a covering of the ''Atman (Hinduism), Atman'', or Self according to Vedantic philosophy. The five sheaths, summarised with the term Panchak ...

, an element in human being makeup according to Hinduist philosophy *

Koteka The koteka ( Mee, ), 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. The koteka is normally made from a dried-out gourd, ''Lagenar ...

, a penis sheath worn by some natives of New Guinea * ''Sheath'' (album), a 2003 album by LFO *

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 ...

, a type of dress

Biology

Carotid sheath The carotid sheath is a condensation of the deep cervical fascia enveloping multiple vital neurovascular structures of the neck, including the common and internal carotid arteries, the internal jugular vein, the vagus nerve (CN X), and ansa c ...

, connective tissue around the neck's vascular compartment * Leaf sheath, the leaf base when it forms a vertical coating surrounding the stem *

Myelin sheath Myelin Sheath ( ) is a lipid-rich material that in most vertebrates surrounds the axons of neurons to insulate them and increase the rate at which electrical impulses (called action potentials) pass along the axon. The myelinated axon can be lik ...

, an insulating layer over the axon of a neuron * Preputial sheath, protective skin around the penis or clitoris ** Clitoral sheath **

Penile sheath Almost all mammal penises have foreskins or prepuces. In non-human mammals, the prepuce is sometimes called the penile sheath or preputial sheath. In koalas, the foreskin contains naturally occurring bacteria that play an important role in fer ...

, the foreskin into which a penis retracts *

Rectus sheath The rectus sheath (also called the rectus fascia.) is a tough fibrous compartment formed by the aponeuroses of the transverse abdominal, transverse abdominal muscle, and the internal oblique, internal and external oblique muscles. It contains the ...

, the laminas around abdominal muscles * Root sheath, the inner or epidermic coat around the root of a hair follicle *

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 contains a lubricating fluid (synovial fluid) that allows for smooth motions of the tendon during muscl ...

, a synovial membrane surrounding a tendon in, for example, the fingers

Medicine

Introducer sheath The Seldinger technique, also known as Seldinger wire technique, is a medical procedure to obtain safe access to blood vessels and other hollow organs. It is named after Sven Ivar Seldinger (1921–1998), a Swedish radiologist who introduced the ...

is used to insert catheters and tools into blood vessels

Biology

Medicine

See also