Question

What structures in the human body provide a function similar to that of sclerenchymacellsin plants

Answer 1

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Answer 2

Sclerenchyma is a supporting tissue in plants. Two groups of sclerenchyma cells exist: fibres and sclereids. Their walls consist of cellulose, hemicellulose and lignin. Sclerenchyma cells are the principal supporting cells in plant tissues that have ceased elongation. Sclerenchyma fibres are of great economical importance, since they constitute the source material for many fabrics (flax, hemp, jute, ramie).

Unlike the collenchyma, mature sclerenchyma is composed of dead cells with extremely thick cell walls (secondary walls) that make up to 90% of the whole cell volume. The term "sclerenchyma" is derived from the Greek σκληρός ("sklē-rós"), meaning "hard". It is the hard, thick walls that make sclerenchyma cells important strengthening and supporting elements in plant parts that have ceased elongation. The difference between fibres and sclereids is not always clear. Transitions do exist, sometimes even within one and the same plant.
SOURCE: http://en.wikipedia.org/wiki/Sclerenchyma#Sclerenchyma
The analogous organ in animals might be connective tissue which include cartilage, bone, adipose tissue as the basic function of these cells are support compared to screrenchyma
http://en.wikipedia.org/wiki/Connective_tissue
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Answer 3

sclerenchyma is supporting tissue in a plant. Any organ in human body is made up of three principal components. A) the functional cells B) the supporting tissue (matrix) C) blood vessels

Supporting tissue in human beings varies from tissue to tissue. It is made up of collagen in most of the tissues. Like fibers consisting sclerenchyma, collagen is also made up of interwoven fibers of complex proteins, which are very complexly arranged. I think complex details are not needed here.

It is necessary to emphasize here that different organs have different supporting tissues, but collagen matches most closely to the structure and function of sclerenchyma. Other forms of supporting tissues include cartilage, fibrocytes, adipose tissue etc