MSK L3 Joint structure and function Flashcards Preview

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Flashcards in MSK L3 Joint structure and function Deck (102)
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1

Classification of Joints:

According to structure
According to function

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Classification of Joints: According to structure

1. Fibrous
2. Cartilaginous
3. Synovial

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Classification of Joints:
According to function

Synarthroses
Amphiarthroses
Diarthroses

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1. Synarthroses

no/little movement (fibrous and some cartilaginous joints

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2. Amphiarthroses

– some movement (cartilaginous joints)

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3. Diarthroses

free movement (always synovial joints)

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Fibrous

no joint cavity and dense fibrous connective tissue joining articulating surface.

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Cartilaginous joints

no cavity and two bones are joined y pad of cartilage – fibrous or hyaline.

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Synovial –

cavity between ends of articulating bones – ends covered with fibrous or hyauline for protection.

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Fibrous Joints: 3 sub classifications:

1. Sutures
2. Syndesmoses
3. Gomphoses

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Sutures


Found only in the skull,
Form at 18mths of age when they replace fontanels
Fibrous tissue covered by periosteum

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Several types of sutures

1. Serrate (between frontal and parietal bones)
2. Lap or squamous - overlap (between parietal and temporal bones
3. Plane or butt (between paired maxillary bones forming hard palate).

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Synostosis sutures

Sutures may become totally ossified in adults forming a synostosis (e.g. between frontal bones)

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Syndesmoses:Definition

Bones joined by interosseous ligament or dense aponeurotic membrane

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Syndesmoses: Example

Interosseous membrane between radius and ulna

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Syndesmoses: Movement

Flexibility of collagen fibres in ligament may allow limited movement

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Gomphoses: Definition

Pegs and sockets, held in place by bundles of regular collagenous connective tissue

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Gomphoses: Example

Found between teeth and bones of jaw – periodontal ligaments

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Gomphoses:Movement

Allow sight movement of teeth during mastication as collagen fibres are orientated in different planes.

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Cartilaginous joints: types

1. Synchondroses (primary)
2. Symphyses (secondary)

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Syncondroses (primary) Definition

Advancing centres of ossification separated by hyaline cartilage

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Syncondroses (primary) Temporary types

Most are temporary (e.g. epiphyseal growth plates (and fuse in adults

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Syncondroses (primary) Permanent types

Some persist throughout life e.g. costal cartilages, which allow some flexibility of rib cage during inspiration.

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Symphyses (secondary) Definition

Fibro-cartilage pads between a.c. of adjacenet bones

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Symphyses (secondary) Movement

Allow for slight movement: Symphysis pubis allows expansion of pelvis in childbirth.

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Symphyses (secondary)Examples

Symphysis pubis – childbirth
Intervertebral discs allow limied motion between vertebrae

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Symphyses (secondary)Examples that fuse

Some symphses fuse during growth (e.g. sacral and coccygeal discs)

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Synovial Joints: Definition

Articulating bones separated by synovial cavity filled with synovial fluid

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Synovial Joints: Movement

Cavity gives synovial joints wide range of movement compared to other joints

30

Synovial Joints: Examples of movement in different planes

Plane (or gliding)
Hinge
Pivot
Ellipsode(or condyloid)
Saddle
Ball and socket

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