There is often no internal space inside sclerenchyma cells because the walls are so thickened with lignin.
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Sclerenchyma is a type of permanent tissue that makes the plant hard and stiff, providing strength to the plant parts.
Sclerenchyma tissue can be found in stems, around vascular bundles, in the veins of leaves, and in the hard covering of seeds and nuts.
Collenchyma allows bending of various parts of a plant like tendrils and stems of climbers without breaking, and it also provides mechanical support.
Collenchyma provides flexibility in plants and is commonly found in leaf stalks below the epidermis.