medullary ray

• 肾髓质中呈放射状伸入皮质的结构，由直小管和集合管组成，参与尿液的浓缩和运输。

A structural component found in the renal cortex of the kidney, consisting of straight tubules and collecting ducts that extend from the medulla into the cortex, playing a role in urine concentration and transport.

1. Plant anatomy structureC2formal

   A band of parenchyma cells in the stem of a plant that extends radially from the pith to the cortex, involved in lateral transport of nutrients.

   髓射线

   • Medullary rays are visible in a cross-section of a tree trunk.
   • These rays help transport water and nutrients across the stem.
   • In woody plants, medullary rays can store starch.

2. Kidney structureC2formal

   A group of straight tubules and blood vessels that extend from the renal cortex into the medulla of the kidney.

   髓放线

   • The medullary ray contains loops of Henle and collecting ducts.
   • Damage to the medullary ray can affect kidney function.
   • Histologists study the medullary ray to understand urine concentration.