Session 1 Introduction Flashcards

1
Q

Developmental origin of bones, connective tissue and skeletal muscle

A

Mesoderm of trilaminar disc

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2
Q

Functions of bone 6

A
  • Support
  • Storage
  • Metabolic
  • Movement
  • Protection
  • Haemoatopoiesis

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3
Q

Characteristics of skeletal muscle

A

Striated and voluntarily controlled

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4
Q

Functions of skeletal muscle 6

A
  • Locomotion
  • Posture
  • Metabolic
  • Venous return
  • Heat production
  • Continence

Love possibly makes very hot couples

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5
Q

Metabolic roles of bone

A

Homeostasis of calcium and phosphate, storage and release

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6
Q

Storage roles of bone

A

Calcium and phosphate, protein, bone marrow rich in fat, growth factors and cytokines

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7
Q

What do tendons and ligaments do

A

Tendons Connect muscle to bone

Ligaments connect bone to bone

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8
Q

What is fascia

A

Sheets of connective tissue which envelop groups of muscles and divide body parts, protective function

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9
Q

What is hyaline cartilage

A

Found at ends of bones contributing to joints, for frictionless motion

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10
Q

What is fibrocartilage

A

For shock absorption, increases bony congruity, higher collagen content

E.g. menisci of knee

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11
Q

What is synovial membrane

A

Tissue found within joints, bursae and tendon sheaths. Produces synovial fluid which lubricates joints

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12
Q

Bone components are divided into

A

Cellular and non-cellular

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13
Q

Cellular components of bones

A

Osteocytes, osteoblasts, osteoclasts

Also fibroblasts, macrophages, mast cells and adipocytes

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14
Q

What mineralises the extracellular matrix

A

Calcium phosphate

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15
Q

Major fibre type in bone and other contents

A

Collagen, not much elastin,

Bone also contains water, glycosaminoglycans, proteoglycans

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16
Q

2 major components giving bone its mechanical properties are

A

Collagen and calcium phosphate

Collagen- tensile strength
Calcium phosphate- Compressive strength

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17
Q

Osteoblast role

A

OsteoBlast = Builder

Synthesise new bone, migrate over matrix, synthesise and deposit osteoid (matrix protein) and deposit calcium phosphate into it

18
Q

Osteoclast role

A

Multi nucleated cells which secrete acidic chemicals to dissolve bone.

Minerals in ionic form are absorbed into osteoclast and released into extracellular fluid

Resorption

19
Q

osteoblasts form osteocytes when they are

A

Trapped within the bone matrix in lacunae. Become involved in signalling processes. Communicate via filipodia (projections)

20
Q

Two types of bone

A

Compact (dense outer layer) and spongy bone/cancellous bone (meshwork of trabeculae)

21
Q

2 divisions of skeleton

A

Axial and appendicular skeleton

22
Q

Long bones features

A
  • Diaphysis is the shaft
  • Flares out at each end to metaphysis, adjacent to growth plate, on other side is epiphysis
  • Articulating surfaces covered in hyaline cartilage
  • other bony surfaces covered with periosteum
  • Medullary cavity lined with endosteum
23
Q

What is in medullary cavity

A

red marrow in child, high fat content in adults, nutrient artery supplies marrow

24
Q

What are sesamoid bones

A

Bones embedded in tendons

25
Short, flat, sesamoid and irregular bones features
2 layers of compact bone with a layer of spongy bone between them bone marrow contained between trabeculae of spongy bone No growth plate or epiphysis
26
What is bone remodelling
Occurs in response to environmental factors- change in balance of activity between osteoblasts and osteoclasts
27
What is a joint
An articulation between 2 or more bones
28
Fibrous joints key features
very limited mobility and high stability | e.g. sutures of skull, inferior tibiofibular joint, posterior sacroiliac joint
29
What are cartilaginous joints
- Joints that use cartilage to unite bones - Typically in midline and epiphyseal plates of long bones - Primary: hyaline cartilage and are completely immobile e.g. epiphyseal growth plates of long bones - Secondary: hyaline cartilage and pad of fibrocartilage between them. Also known as symphyses. E.g. symphysis pubis in pelvis
30
Major features of synovial joint
Joint cavity containing synovial fluid, lubrication to articular surfaces, high degree of mobility
31
Articulating surfaces within a synovial joint are usually covered with
Hyaline cartilage (exceptions include acromioclavicular joint which is covered in fibrocartilage)
32
Fibrous capsule is composed of
Collagen in bundles, stabilises joint, continuous with periosteum covering surface of adjacent bones
33
What is synovial membrane
Thin highly-vascularised membrane that produces synovial fluid
34
What is a bursa
Small sac lined by synovial membrane and containing a thin layer of synovial fluid- reduces friction and allows free movement
35
What are tendon sheaths
Elongated bursae that wrap around a tendon and reduce friction
36
What is in synovial fluid
Hyaluronic acid, lubricin, proteinases and collagenases
37
Main functions of synovial fluid
- Reduce friction - Shock absorber - transport nutrients and remove waste (articular cartilage)
38
Articular cartilage blood supply
Avascular
39
Fibrous capsule and ligaments have a
Poor blood supply
40
Factors affecting range of motion of joints
- Structure or shape of articulating bones - Strength and tension of joint ligaments - Arrangement and tone of muscles around the joint - Apposition of neighbouring soft tissues - Hormones - Disuse