Nerve
/ˈnɝv/
Definition
Nerve is a vein-like structure in a plant organ, especially a leaf, formed by a vascular bundle or its branch. In leaves, nerves extend through the blade and contain vascular tissues that transport water, minerals, and sugars while also providing structural support. The term is often used to describe the visible lines or ridges that form the leaf’s venation pattern.
Function in Plants
- Transport pathways: Branching patterns distribute water and dissolved minerals from the leaf’s vascular system toward surrounding tissues, while sugars produced by photosynthesis are transported away from mature leaf areas.
- Structural support: Larger veins and their branches help reinforce the leaf blade, contributing to its mechanical strength and helping maintain the arrangement of tissues between the vascular strands.
- Venation patterns: The arrangement and branching of these structures form characteristic venation patterns, such as parallel venation in grasses and netted venation in many broad-leaved plants.
- Taxonomic clues: Differences in branching, spacing, and prominence can help botanists distinguish plant groups and identify species, particularly when combined with other leaf characteristics.
Related Terms
Vein
Vein refers to one of the vascular strands in a leaf or other plant organ. It contains xylem and phloem, the tissues…
Venation
Venation refers to the pattern and arrangement of veins in a leaf blade, or sometimes in other flat plant organs. It is…
Midrib
Midrib refers to the main central vein of a leaf blade. It runs from the leaf stalk, or petiole, toward the tip and is…
Leaf
Leaf refers to a plant organ, usually flat and green, that grows from the stem or a branch and is specialized for…
Leaf blade
Leaf blade refers to the broad, usually flat part of a leaf, also called the lamina. It is the main photosynthetic…
Leaflet
Leaflet refers to one of the individual blade-like sections of a compound leaf, where a single leaf is divided into…
Parallel venation
Parallel venation describes a leaf vein pattern in which the main veins run lengthwise beside each other from the leaf…