tubule

Noun
  1. A small tube (synset 105254139)
    is a type of: tube, tube-shaped structure - (anatomy) any hollow cylindrical body structure
    subtypes:
    • microtubule - a microscopically small tubule
    • nephron, uriniferous tubule - any of the small tubules that are the excretory units of the vertebrate kidney
    • uveoscleral pathway - a tubule that drains excess aqueous humor
    • seminiferous tubule - any of the numerous long convoluted tubules in the testis which are the sites where spermatozoa mature
    • vasa efferentia - the several highly convoluted tubules that lead from the rete testis to the vas deferens and form the head of the epididymis
    • trachea - one of the tubules forming the respiratory system of most insects and many arachnids

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