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Flashcards in Physiology Deck (19)
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1

Three types of joint

Synovial, Fibrous, Cartilaginous

2

Example of fibrous joint

Sutures in the skull

3

Examples of cartilaginous joints

IV discs, costochondral joints, pubic symphysis, part of the sacroiliac joint

4

What is the synovial membrane?

a vascular connective tissue with capillary networks and lymphatics. It contains synovial cells (fibroblasts)

5

Definition of a simple synovial joint

has only one pair of articular surfaces

6

Definition of a compound synovial joint

has more than one pair of articular surfaces

7

3 Roles of joints during movement

1. Stress distribution 2. Conferring stability 3. Joint lubrication

8

Where is the greatest share of stress distributed within a joint?

Across the muscles and tendons crossing the joint

9

How does a joint confer stability?

the shape of the articular components and the ligaments providing stabilisation.

10

What provides joint lubrication? (3)

1. cartilage interstitial fluid 2. synovium derived hyaluronic acid 3. synovium derived lubricin

11

Functions of synovial fluid (3)

1. lubricates the joint preventing wear and tear 2. aids in the nutrition of the articular cartilage 3. supplies the chondrocytes with O2, nutrients and removes waste

12

What causes the high viscosity of synovial fluid?

hyaluronic acid

13

Cells found in synovial fluid

mononuclear leucocytes - very few cells found though

14

3 main components of the articular cartilage ECM

Water, type II collagen, proteoglycan

15

What is a motor unit?

a single a-motor neuron and all the skeletal muscle fibres it innervates

16

What does the no. of fibres per motor unit depend on?

the function serve by a muscle

17

An example location of a motor unit with few fibres per a-motor neuron might be?

the eye - precision matters more

18

An example location of a motor unit with many fibres per a-motor neuron might be?

the thigh muscle - power is more important than precision

19

How are myofibrils arranged within the muscle fibre?

into sarcomeres