columnar

(adjective)

Having the shape of a column.

Related Terms

Examples of columnar in the following topics:

  • Epithelial Tissues

    • The nuclei of columnar epithelial cells in the digestive tract appear to be lined up at the base of the cells .
    • Columnar epithelial cells lining the respiratory tract appear to be stratified.
    • This is called pseudostratified, columnar epithelia .
    • Simple columnar epithelial cells absorb material from the digestive tract.
    • Pseudostratified columnar epithelia line the respiratory tract.

  • Types of Epithelial Tissue

    • The four major classes of simple epithelium are: 1) simple squamous; 2) simple cuboidal; 3) simple columnar; and 4) pseudostratified.
    • Simple columnar epithelium is a single row of tall, closely packed cells, aligned in a row.
    • These are simple columnar epithelial cells whose nuclei appear at different heights, giving the misleading (hence pseudo) impression that the epithelium is stratified when the cells are viewed in cross section.
    • Stratified epithelia can be columnar, cuboidal, or squamous type.
    • Columnar epithelium has cells taller than they are wide.

  • Testes Ducts

    • The epithelium of the tubule consists of Sertoli cells, which are tall, columnar type cells that line the tubule.
    • The ductuli are unilaminar and composed of columnar ciliated and nonciliated (absorptive) cells.

  • Epithelial Membranes

    • Most mucous membranes contain stratified squamous or simple columnar epithelial tissue.

  • Measurements: Gauge Pressure and the Barometer

    • Hydrostatic based barometers consist of columnar devices usually made from glass and filled with a static liquid of consistent density.
    • The columnar section is sealed, holds a vacuum, and is partially filled with the liquid while the base section is open to the atmosphere and makes an interface with the surrounding environment .
    • This change in pressure causes the height of the fluid in the columnar structure to change, increasing in height as the atmosphere exerts greater pressure on the liquid in the reservoir base and decreasing as the atmosphere exerts lower pressure on the liquid in the reservoir base.

  • Absorption in the Small Intestine

    • The inner wall, or mucosa, of the small intestine is lined with simple columnar epithelial tissue.

  • Cytophaga and Relatives

    • The Cytophaga columnaris, also referred to as Flavobacterium columnare or Bacillus columnaris, are responsible for the columnaris disease in salmonid fish.

  • Mucosa

    • In the stomach the epithelium is simple columnar, and is organized into gastric pits and glands to deal with secretion.

  • The Propylaea and the Erechtheion

    • The women replace columns, yet look columnar themselves.
    • The sculpted columnar form of the caryatids is named after the women of the town of Kayrai, a small town near and allied to Sparta.

  • Skin and Mucosae (Surface Barriers)

    • In the stomach it is simple columnar, and is organised into gastric pits and glands to secrete acids and pepsin.
    • The small intestine epithelium is specialised for absorption; it is organised into simple columnar epithelium on protruding villi with narrow crypts, that have a high surface area.