Question

Sharpey's fibres occur inside
A. Collagen
B. Muscle
C. Bones
D. Skin

Answer 1

Sharpey's fibres are the type I collagen fibres which are responsible for connecting the outer membrane called periosteum to the bone. Human body possesses 90% of the type I collagen. In 1846, William Sharpey first described the sharpey’s fibres.

Complete answer:
Collagen is a rope like protein fibre which is located in various connective tissues like bones cartilages, ligaments etc. there are major five types of collagens are found, named type I collagen, type II collagen, type III collagen, type IV collagen and type V collagen. These flexible fibres mainly provide flexibility and strength to the body.
Muscle tissue is responsible for providing movement of both internal organs (heart contraction) and external organs (locomotion, movement of hands and legs). Muscle tissues are made up of muscle fibres. There are three types of muscle fibres are found named, skeletal muscle fibre, smooth muscle fibre and cardiac muscle fibre.
Bones are dense, hard connective tissues that provide structural support to the body and protection to the internal organs from external injury. Periosteum, the outer membrane of bone contains Sharpey's fibre. Sharpey's fibres are embedded into the cementum and the alveolar Bone’s periosteum of the teeth and provide joining between periodontal ligament and tooth.
The largest organ of the body is skin. Skin is composed of three layers named, epidermis dermis, and hypodermis.
So, the correct answer is “Option C”.

Note: Sharpey's fibre is also known as perforating fibres. It is a poorly mineralised fibre. Apart from teeth Sharpey's fibres are also found in other parts of the body like skull and spine. In the skull cranial bones are connected by sharpey's fibre. It also joins the intervertebral disc to its adjacent vertebrae.