Question

Tendon sheaths ________. Tendon sheaths ________. are lined with dense irregular connective tissue help anchor the tendon to the muscle are extensions of periosteum act as friction-reducing structures

Answer 1

Tendon sheaths are connective tissue sacs that surround muscle tendons at joint crossings. They contain lubricating fluid and help reduce friction, allowing smooth tendon movements.

Step-by-step explanation:

A tendon sheath is a connective tissue sac that surrounds a muscle tendon at places where the tendon crosses a joint. It contains a lubricating fluid to prevent friction and allow smooth movements of the tendon. Tendon sheaths are lined with dense irregular connective tissue, and their main function is to act as friction-reducing structures.

Tendon sheaths serve protective and functional roles in the body. They reduce friction between tendons and surrounding structures, allowing smooth movement. The synovial fluid within the sheath nourishes and lubricates the tendon. These structures are crucial for efficient muscle and joint function, preventing wear and tear during repetitive movements in various parts of the body.

Answer 2

Tendon sheaths act as friction-reducing structures.

Step-by-step explanation:

Tendon sheaths are fibrous tissue that is around tendons to protect and make the movements of these smoother. For example, they reduce the friction of the flexors and extensors tendons of the hand. These are tendons that we constantly use to open and close our hands when we want to grab objects. Without the sheath, the tendons will not move easily, and due to the excessive use, there can be inflammation.

The sheats have two layers, one internal, which is a synovial one that produces synovial fluid to lubricate the tendon, and the external, which is a fibrous layer.