It is called a vein.
Leaf Apex- The outer end of the leaf Vein- Supports the leaf and transports both food and water Midrib- The central rib of the leaf Axil- Angle between the upper side of a stem and a leaf or petiole Petiole- Attaches the leaf to the plant Lamina- The blade of the leaf Stipule- Paired appendages that are found at the base of the petiole Stem- The main support of the leaf
Main vein, Central vein, Mid vein are all correct to a point. "Rachis" seems to be the scientifically preferred term, though. "Midrib" also sees some usage in a few types of leaf.
A typical dorsiventral leaf has a petiole, leaf blade, mid rib and large number of veins. The leaf blade can be differentiated into palisade and spongy parenchyma. Both these tissues are surrounded by an epidermis which is interspersed by stomatal pores. The mid rib and its associated veins are provided with vascular bundles.
The sternum.
The central vein can be called a midrib or mid-vein
Mid-rib
It is a rib or a riblike part, such as the midrib of a leaf or a thickened anterior vein or margin of an insect's wing.
A palmately lobed leaf has lobes that radiate out from a central point, resembling the fingers of a hand. Look for a leaf with multiple lobes that are connected at a central point, similar to the shape of a palm.
Leaf Apex- The outer end of the leaf Vein- Supports the leaf and transports both food and water Midrib- The central rib of the leaf Axil- Angle between the upper side of a stem and a leaf or petiole Petiole- Attaches the leaf to the plant Lamina- The blade of the leaf Stipule- Paired appendages that are found at the base of the petiole Stem- The main support of the leaf
A center midrib is the central vein that runs along the underside of a leaf, providing support and acting as a conduit for nutrients and water flow to and from the leaf. It helps maintain the leaf's structure and shape.
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