Joints, Synovial Fluids and Cartilage Flashcards

1
Q

Which joints are fibrous joints

A

Peridontal Ligament, the cranial sutures and the interosseous membranes

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2
Q

Describe a fibrous joint

A

At a fibrous joint, the adjacent bones are directly connected to each other by fibrous connective tissue, and thus the bones do not have a joint cavity between them

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3
Q

State the three types of fibrous joints

A

Sutures, Gomphoses and Syndesmoses

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4
Q

Sutures

A

Immovable joints only found between, the flat plate like bones of the skull

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5
Q

When are suture joints important

A

At birth

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6
Q

Gomphoses

A

Immovable joint where the teeth articulate with their sockets in the maxillae or the mandible

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7
Q

Syndesmosis

A

Movable joints in which bones are held together by an interosseus membrane

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8
Q

What are the function of syndesmosis joints

A

Provide strength along the length of long bones

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9
Q

Give examples of syndesmosis joints

A

Middle radio-ulnar and the middle tibiofibular joints

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10
Q

In cartilaginous joints, what are the bones attached by

A

Fibro or hyaline cartilage

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11
Q

What type of cartilage do synchondroses or primary cartilaginous joints contain

A

Hyaline

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12
Q

Give an example of a primary cartilaginous joint

A

Between the diaphysis and epiphysis

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13
Q

symphyses

A

Involve either hyaline or fibrocartilage and are slightly movable. An example is the pubic symphysis

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14
Q

Hinge synovial joint

A

Permits flexion and extension. Elbow joint is an example

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15
Q

Saddle synovial joint

A

Concave and convex joint surfaces unite at saddle joints. An example is the metatarsophalangeal joint

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16
Q

Plane synovial joint

A

Permits gliding or sliding movements. Example is the acromioclavicular joint

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17
Q

Pivot synovial joint

A

Allows rotation; a round bony process fits into a bony ligamentous socket. Examples are the atlantoaxial joint and the proximal radio-ulnar joint

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18
Q

Condyloid synovial joint

A

Permits flexion, extension, adduction, abduction and circumduction. Metacarpophalangeal joint (middle of the hand)

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19
Q

Ball and socket synovial joint

A

Permits movement in several axis, an example is the glenohumeral joint

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20
Q

The articular cartilage of synovial joints is made up of

A

Hyaline cartilage

21
Q

Describe the superficial/tangential layer of cartilage

A

Made up of flattened chondrocytes that produce collagen and glycoproteins (lubricin)

22
Q

Describe the transitional layer of cartilage

A

Round chondrocytes that produce proteoglycans from superifical to deep levels

23
Q

State the main functions of cartilage

A

Supporting the framework of organs, form the articulating surfaces of bones and growth and development of long bones

24
Q

Which cartilage is the weakest

A

Hyaline cartilage

25
Describe the collagen fibres in hyaline cartilage
Widely dispersed thin type 2
26
Strongest type of cartilage
Fibrocartilage
27
Describe the structure of fibrocartilage
alternating layers of hyaline cartilage matrix and thick layers of dense collagen fibres orientated in the direction of functional stresses
28
Describe the structure of elastic cartilage
The chondrocytes are found in a threadlike network of elastic fibres in the matrix
29
What are the constituents of cartilage
Chondroblasts, chondrocytes and extracellular matrix (10% aggrecan, 75% water and a mix of collagen fibres)
30
State the function of chondroblasts
Secrete matrix and fibres into the ECM of cartilage
31
What are chondrocytes
Trapped chondroblasts which have matured into chondrocytes
32
What are lacunae
Matrix encolsed comparments that chondrocytes sit in
33
The surface of most cartilage is covered by
A layer of dense irregular connective tissue called the perichondrium
34
What does the outer layer of the periochondrium contain
Collagen producing fibroblasts
35
What does the inner layer of the perichondrium contain
Chondroblasts
36
What is the vascularity of cartilage
Avascular
37
How does cartilage get nourished
Long range diffusion from nearby capillaries in the perichondrium
38
Interstitial growth of cartilage
Chondrocytes grow and divide and lay down more matrix inside existing cartilage
39
Appositional growth of cartilage
New surface layers of matrix are added to the pre-existing matrix by new chondroblasts from the perichondrium
40
How is articular cartilage nourished
From the synovial fluid produced by the synovial membrane
41
What cells produce synovial fluid
Synoviocytes
42
Type A synoviocytes
Look like macrophages. These remove debris and contribute to fluid production.
43
Type B synoviocytes
Fibroblast-like and main producer of synovial fluid
44
What is synovial fluid made up of
* Viscous fluid * Hyaluronic acid and lubricin, collagenases and proteinases * Fluid component
45
State the functions of synovial fluid
Nutrition of articular cartilage, removal of waste products and lubrication
46
Describe the process of lubrication
boundary including glycoproteins such as lubricin bind to receptors on articular surfaces to form a thin film. It is hydrodynamic – surfaces kept apart by liquid pressure and viscosity changes with load and velocity of movements
47
What happens to the viscosity of synovial fluid as age increases
Increases, slower joint movements and reduced lubrication
48
What happens to the water content of cartilage as age increases
Decreases - therefore reduced shock absorption