22-09-21 - MS System: Joints and Muscles Flashcards
What is the definition of a joint?
Where are joints found?
What are the functions of joints?
How many joints are in the body?
What word is anything related to joints?
- Joints are where two or more bones meet to allow movement
- Can be found connecting bones or connecting bone to cartilage
- Functions of joints:
- Facilitate growth
- Hold bones together
- Transmit forces
- Enable various levels of movement
- There are approximately 230 joints in the body. This changes as we grow
- ‘Arthro’ is the word associated with anything to do with joints
What are the 3 classifications of joints by movement?
What is the movement associated with each type?
What are features of each type?
Where can each type be found?
- Synarthroses – immovable/fixed joints – joined together by tough fibrous proteins that interlock to allow close connection and prevent movement – can be found strongly connecting adjacent bones together in the skull
- Amphiarthroses – limited movement – sandwich of hyaline cartilage and fibrocartilage known as intervertebral disks used in joint – used to join bodies of vertebrae
- Synarthroses and amphiarthroses are typically found in the axial skeleton
- Diarthroses – variety of moveable joints – Found in the appendicular skeleton, such as in the limbs
What are the 3 classifications of cells by soft tissue structure?
What is the movement associated with each type?
What are features of each?
Where can each type be found?
- Fibrous – virtually no movement – joined together by tough fibrous proteins that interlock to allow close connection and prevent movement, considered to be a solid joint – can be found strongly connecting adjacent bones together in the skull
- Cartilaginous – limited or no movement – can be synarthroses or amphiarthroses, but broadly considered to be classed as solid – found joining bodies of vertebrae
- Synovial – a variety of movement – can be hinge joints or ball and socket joints – found in the appendicular skeleton in limbs.
What are the 3 types of fibrous joints?
What are they composed of?
What are their purposes?
- Sutures – thick connective tissues compose of mainly type 1 collagen fibres – gives protection to the brain by strongly joining adjacent bones in the skull
- Gomphoses – Collagen fibres in the periodontal ligament that secure teeth into bone of the tooth socket (means nail/bolt)
- Syndesmoses – fibrous membrane that exists between adjacent bones – interosseus ligament that are radioulnar or tibiofibular joints
What are the 2 types of cartilaginous joints?
What are they made from?
What kind of movement do they allow?
Where can they be found?
Synchondroses -
- Primary cartilaginous joint
- Made from Hyaline cartilage – allows bone growth during adolescence and eventually ossifies – allows for limited movement
- Found in the epiphysis/diaphysis of long bones and rib cage (epiphyseal growth plate is a temporary synchondroses)
Symphyses - - Secondary cartilaginous joint
- Made from hyaline and fibrocartilage -provides limited movement, can absorb shock
- Forms the pubic symphysis, found as intervertebral discs between adjacent vertebrae, makes up manubriosternal joint connecting manubrium and sternum (manubriosternal joint)
What are synchondroses?
What are they made from?
What kind of movement do they allow?
Where are they found?
- Synchondroses are primary cartilaginous joints made from hyaline cartilage
- Synchondroses are made from Hyaline cartilage and allow for limited movement
- They form the costochondral joint in ribs 1-10 and the first costosternal joint in rib 1, which connects rib 1 to the sternum.
- This prevents the ribs from moving too much and gives them support
- The costosternal joint in ribs 2-7 are synovial joints, which allow for more movement when breathing
- Synchondroses also form the epiphyseal plates in growing bones.
What are symphyses joints?
What are they made from?
What kind of movement do they allow?
Where are they found?
- Symphyses are secondary cartilaginous joints
- Made from hyaline and fibrocartilage - provides limited movement, can absorb shock
- Found in the axial skeleton
- Found in the manubriosternal joint (joining of sternum and manubrium)
- Separates bodies of vertebrae as intervertebral disks, which are sandwiches of hyaline cartilage and fibrocartilage
- Found in the pubic symphysis
Where are ribs 11 and 12 located
What are they referred to as?
Why are they given this name?
- Ribs 11 and 12 are located below rib 10
- They are referred to as floating ribs, as they do not attach to the sternum, or to another rib
Where is the first thoracic vertebrae (T1) located?
What does it form with the first rib?
- The first thoracic vertebrae (T1) connects to the first rib
- This forms a circle known as the thoracic inlet
What are the 3 parts of the sternal body called?
What is the joint between the bottom 2?
- The top of the sternal body is the manubrium
- The middle of the sternal body is the sternum
- The bottom part of the sternal body is the xiphoid process
- The xiphisternum is the xiphoid process and the sternum together
- The joint between the sternum and the xiphoid process is the xiphisternal joint.
What are false ribs?
What ribs are false ribs?
- False ribs are ribs that do not join to the sternum directly
- the 8th, 9th and 10th ribs are all false ribs, as they do not connect to the sternum directly, but are connected to the 7th rib by cartilage.
What does the costal margin consist of?
Where does it attach?
- The costal margin is the medial margin formed by the cartilages of the 7th to 10th ribs, which extend inferolaterally from the xiphisternal joint
Where does the the diaphragm attach?
- The diaphragm attaches anteriorly to the xiphoid process and costal margin
- It attaches laterally to the 11th and 12th ribs
- It attaches posteriorly to the lumbar vertebrae
What are the only Synovial joints?
What is their main structure?
What is their purpose?
Where are they found in the body?
- Diarthroses and synovial joints are synonymous
- The main structure is a fibrous cavity filled with synovial fluid, with articular (hyaline) cartilage between the 2 bones
- Synovial joints enable a wide range of movement
- Synovial joints are found between bones that move against each other
- This includes joints of the limbs (shoulder, hip, elbow, knee)
What is articular cartilage made from in synovial joints?
Where is it found in the synovial joint?
What is its purpose?
How does it receive nutrients?
How does this affect recovery of injury?
- Articular cartilage in synovial joints is made from hyaline cartilage, which is smooth gel like tissue
- Hyaline cartilage is found between the 2 bones in the joint
- It creates a frictionless surface for the bones to move on
- Articular cartilage in the synovial joint withstands compressive, tensile, and sheer forces using collagen fibres
- There is no blood supplies, nerves, or lymphatic system in the cartilage
- The synovial fluid provides nutrients to and removes waste from the articular cartilage via diffusion
- This is not efficient as a blood supply, so injuries affecting the cartilage take longer to heal.
Label this diagram of a synovial joint
Where is the synovial membrane?
What is it made from?
What is it responsible for?
- The synovial membrane lines the articular cavity of synovial joints
- It is made from collagenous tissue
- It secretes synovial fluid, which supplies nutrients and removes waste from the articular cartilage.
What does synovial fluid consist of?
What is its consistency like?
Where is it found?
What is its purpose?
How does it respond to exercise?
- Synovial fluid contains Hyaluronic acid, lubricin (glycoproteins) and phagocytic cells.
- It possesses a highly lubricating egg-white like consistency
- It is found within the articular cavity of synovial joints.
- It reduces friction between articular surfaces (surfaces within the joint)
- It also provides the cartilage of the synovial joint with nutrients and removes its waste via diffusion.
- When exercising, the alignment of glycoproteins is altered
- Exercises decreases viscosity so that lubrication improves
- This property is known thixotropy (becoming less viscous when subjected to applied stress)
What are bursae made from?
Where are they found?
What is their purpose?
What is bursitis?
- Bursae are fatty closed sacs lines with a synovial membrane and are lubricated with fluid
- They are found where friction occurs such as between skin and bone, or tendons and bone
- They can be found between the fibrous capsule and bone/skin in synovial joints
- Their purpose is to allow smooth action and protection.
- Bursitis is the inflammation of these bursae
What are synovial sheathes?
Where are they found?
What is their purpose?
- Synovial sheaths are specialised bursae that fully surround tendons, where they are subject to pressure.
- They surround tendons that enable dexterity, such as those in the hands and feet.
- These synovial sheaths help protect tendons from abrasive damage as they move
What is the intra-articular disc?
What are they made from?
Where are they found?
What is their purpose?
- The Intra-articular disc is known as meniscus in synovial joints
- They are made form fibrocartilage
- It is found within the fibrous capsule of weight bearing joints or joints capable of rotatory movement (ball and socket joint – diarthroses)
- The disc provides a deeper socket for bone to move in, which reduces chances of dislocation
- The fibrocartilage of the intra-articular disc also cushions and facilitates smooth articulation (connection of bones in a joint)
What is hypermobility/double-jointedness?
What causes it?
What are the potential negative effects of it?
- Hypermobility is the condition in which joints stretch farther than normal.
- It is caused by a disorder of the collagen and connective tissue within the ligaments and joints, which allows for greater flexibility and range of movement.
- This increase range of movement can increase the chances of dislocation of joints
Where is the fibrous capsule?
What is it made from?
What is it responsible for?
- The fibrous capsule is found next to the periosteum of both bones in a synovial joint
- It contains strong connective tissue and a lot of collagen fibres and nerves
- Connective tissue from the fibrous capsule can form into ligaments to hold the 2 bones in the joint.
- This provides strength and integrity to joint and protects the bones from moving out of alignment.
What are tendons made from?
What do they connect together?
What is their purpose?
- Tendons are made from connective tissue that has a lot of strong collagen fibres in it
- Tendons attach muscle to bones
- Tendons are present to hold structures together and keep them stable
What are ligaments made from?
What is their purpose?
What are the 2 types of ligaments?
Where are they found?
- Ligaments are dense bands of fibrous connective tissue and collagen
- They connect bone to bone
- They restrict movement and protect joints from damage.
- They maintain alignment of bones (don’t want side to side movement in a hinge joint)
- Intrinsic ligaments are found within or are part of the fibrous capsule
- Extrinsic ligaments are external to the fibrous capsule.
What is Osteoarthritis?
What can it be worsened by?
Where does it occur?
What does it cause?
- Osteoarthritis (OA) is a degenerative disease of the joints
- Can occur in almost any joint, but most common in hands, knees, hips and spine
- Can be exacerbated by exercise
- Results in reduction in quality of articular cartilage
- Bone nodules called osteophytes form, which alter biomechanical forces and create friction and heat
- This can result in tissue damage and pain.
What are the factors that affect joint stability?
- Articular surfaces – The larger the surface and deeper the socket, the better the stability of the joint.
- This is why shoulders dislocate more often than legs. The leg joint sits deeper in its socket than the shoulder joint.
- Ligaments – reinforce and prevent undesirable movement – ligaments and tendons provide a huge level of support to the joint.
- The tone of muscles whose tendons cross across the joint is the most important stabilising factor. Can be increased by hypertrophy work.
What are the 6 types of synovial joints?
How many axes can they move in?
What movements can they perform?
Where can they be found
- Ball and socket – 3 axes – flexion/extension, abduction/adduction, rotation, circumduction – shoulder
- Condyloid – 2 axes – flexion/extension, abduction/adduction, and circumduction - Carpel bones in wrists
- Saddle – 2 axes – flexion/extension, abduction/adduction – thumb
- Hinge – 1 axis - flexion and extension – elbow
- Pivot - 1 axis – rotation – neck
- Gliding/plane – 0 axes? - rotation – rotating of radius/ulna
What are the 3 functional groups associated with movement?
What are their functions?
Give the 3 functional groups for lifting a cup
- Agonist – the prime mover
- Synergist/fixator – additional force/prevents undesirable movements (helps control movement)
- Antagonist – opposes the movement – gives greater control ex. Riding bike with one hand vs two.
What is Rheumatoid Arthritis?
What does it cause?
Who is affected most common by this?
- Rheumatoid Arthritis (RA) is an auto-immune disease in which the body attacks its own tissues
- This causes changes in synovium, which lead to destruction of articular cartilage
- Synovium is connective tissue that lines the inside of the fibrous capsule
- This leads to reduced dexterity in the affected joints
- Affects about 1% of population, but most common in women
What are superficial and deep fascia?
What are their functions?
- Superficial fascia (subcutaneous tissue) is a connective tissue layer that connects the skin to the underlying bones or deep fascia.
- It is also a fat storage and acts as insulation and protective padding
- Deep fascia is a dense connective tissue
- The primary function of deep fascia is to support and protect muscles and other soft tissue structures
- It can surround individual muscles and groups of muscles with shared function to separate into fascial compartments
- Ex groups of muscles for flexing and extending are grouped separately and can glide over one another smoothly due to deep fascia.
What are the 3 types of muscle?
Are they striated or non-striated?
Are they voluntary or involuntary?
Fill in a flow chart for classification of joints by movement
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Name the different shape of skeletal muscle and give an example of where they can be found
What are the different types of movement?
What are the different structures present in a skeletal muscle from inside to out?
- Endomysium in between individual muscle fibres
- Perimysium in between fascicles
- Epimysium around the muscle exterior
