Spiral valves of Heister are undulating folds or valves in the proximal

mucosa A mucous membrane or mucosa is a membrane that lines various cavities in the body of an organism and covers the surface of internal organs. It consists of one or more layers of epithelial cells overlying a layer of loose connective tissue. It is ...

of the

cystic duct The cystic duct is the short duct that joins the gallbladder to the common hepatic duct. It usually lies next to the cystic artery. It is of variable length. It contains 'spiral valves of Heister', which do not provide much resistance to the ...

. The cystic duct attaches the

gallbladder In vertebrates, the gallbladder, also known as the cholecyst, is a small hollow organ where bile is stored and concentrated before it is released into the small intestine. In humans, the pear-shaped gallbladder lies beneath the liver, although ...

to the

common bile duct The common bile duct, sometimes abbreviated as CBD, is a duct in the gastrointestinal tract of organisms that have a gallbladder. It is formed by the confluence of the common hepatic duct and cystic duct and terminates by uniting with pancreati ...

. The spiral valves of Heister are supported by underlying smooth

muscle Skeletal muscles (commonly referred to as muscles) are organs of the vertebrate muscular system and typically are attached by tendons to bones of a skeleton. The muscle cells of skeletal muscles are much longer than in the other types of muscl ...

fibers. There is some uncertainty regarding the role of the folds. Historically, physicians believed that their function was to aid in the passage of

bile Bile (from Latin ''bilis''), or gall, is a dark-green-to-yellowish-brown fluid produced by the liver of most vertebrates that aids the digestion of lipids in the small intestine. In humans, bile is produced continuously by the liver (liver bile ...

to and from the gallbladder, as well as regulate the degree of gallbladder distension. The presence of the spiral folds, in combination with the tortuosity of the cystic duct, makes

endoscopic An endoscopy is a procedure used in medicine to look inside the body. The endoscopy procedure uses an endoscope to examine the interior of a hollow organ or cavity of the body. Unlike many other medical imaging techniques, endoscopes are insert ...

cannula A cannula (; Latin meaning 'little reed'; plural or ) is a tube that can be inserted into the body, often for the delivery or removal of fluid or for the gathering of samples. In simple terms, a cannula can surround the inner or outer surfaces ...

tion and catheterization of the cystic duct extremely difficult. Also, the valves of Heister are susceptible to

laceration A wound is a rapid onset of injury that involves lacerated or punctured skin (an ''open'' wound), or a contusion (a ''closed'' wound) from blunt force trauma or compression. In pathology, a ''wound'' is an acute injury that damages the epiderm ...

s and were a serious obstacle to the surgical canalization. Thanks to newer technologies, nowadays this procedure is possible. They were named after German

anatomist Anatomy () is the branch of biology concerned with the study of the structure of organisms and their parts. Anatomy is a branch of natural science that deals with the structural organization of living things. It is an old science, having its ...

Lorenz Heister Lorenz Heister (Latin: ''Laurentius Heister'') (19 September 1683 – 18 April 1758) was a German anatomist, surgeon and botanist born in Frankfurt am Main. Biography From 1702 to 1706 Heister studied at the Universities of Giessen and Wetzl ...

(1683–1758).

Imaging

On ultrasound, valve of Heister is echogenic.

Imaging

References

Further reading