2.Musculoskeletal system Flashcards
Overall function of musculoskeletal system
provide form (coordination), support, stability and movement
Identify types of bone tissue
compact and cancellous
Identify functions of bones
Protection, movement, boundary, RBC formation, store minerals
Identify types of bone
long, short, irregular, flat and sesamoid
Describe compact bone
Hard outer layer that is dense, strong and durable
~80%
Describe cancellous bone
Network of trabecular rodlike structures
-lighter less dense and more flexible than compact backbone
compact=
cortical
cancellous =
trabecular , spongy
Function of osteoblasts
make new bone and repair old bone
Function of osteocytes
-connect osteocytes and osteoblasts
-allow for communication within bone tissue
Function of osteoclasts
break down bone
osteocyte structure
inactive osteoblasts, trapped in bone
osteoclasts structure
large cells with multiple nuclei
How do bones provide protection and support
-help maintain posture eg vertebra
-protects organs eg ribs protect lung,s and sternum the heart
How do bones allow movement
-bones act as attachment sites for tendons and muscles
-muscles contract, pulling on bone and generating movement
How do bones provide a boundary
boundary between thoracic, pelvic and cranial cavities
How do bones allow for haemopoiesis
RBC produced in the (red) bone marrow
How do bones allow ‘storage’
they store minerals such as Ca, P. Na, K
Outline functions of Ca, P, Na,K
Ca=integrity of bones and BP
P=bones & teeth + acid balance
Na=muscle contraction + fluid balance
K=muscle contraction + nerve transmission
What is the diaphysis
compact bone, central medullary canal and fatty yellow bone marrow
shaft of bone
Structure of periosteum
complex vascular 2 layer membrane (fibrous outer)
Structure of epiphysis
outer compact bone, inner cancellous (spongy) bone
What are short bones
roughly cubicle , same width and length
Give an example of short bone
carpals
What are irregular bones
no regular shapes or characteristics
example of irregular bones
vertebra & some cranial bones
what are flat bones
provide flat areas for muscle attachment & usually protect organs
example of flat bone
sternum, ribs and some skull bones
What are sesamoid bones
small bones developed in tendons
example of sesamoid bone
patella
Identify structure of spine
Cervical, thoracic, lumbar, sacral, coccygeal
identify number of bones in each section of spine
C7,T12,L5 [5,4 (9)]
Identify 3 types of joints
fibrous, cartilaginous and synovial
Structure of fibrous joint
tough connective tissue
Function of fibrous joint
join bones with little to no movement
example of fibrous joint
skull, sacral & coccygeal
Structure of cartilaginous joints
connected entirely by cartilage
Function of cartilaginous joints
absorb shock between joints
example of cartilaginous joint
vertebra and pubic symphysis
Structure of synovial joints
space with a capsule between two articulating bones
Function of synovial joints
allow for movement eg flexion and extension
Identify types of synovial joint
ball and socket, hinge, pivot, saddle & gliding
Structure of ligament
band of strong fibrous tissue
describe ligament
connect bone to bone
Structure of synovial fluid
opaque/slippery ‘egg white’ fluid in joint cavity
function of synovial fluid
reduce friction between articular cartilage in joint
Structure of articular cartilage
glassy, smooth cartilage that is spongy and covers ends of bones in joints
Function of articular cartilage
absorb shock and prevent friction between ends of bones in joints
Structure of joint capsule
tough fibrous tissue that has two layers, fibrous capsule lying outside synovial membrane
Function of joint capsule
fibrous capsule strengthens joint and synovial membrane lines + secretes synovial fluid
Structure of bursa
flattened fibrous sac containing thin film of synovial fluid
function of bursa
prevent friction at sites where muscles, tendons and bones might rub together
Structure of meniscus
wedge of white fibrocartilage
function of meniscus
make joints more stable and reduce wear and tear on joint surfaces
Structure of pad of fat
fatty pad
function of pad of fat
provide cushioning between fibrous capsule and a bone or muscle
identify types of synovial joints
hinge, ball & socket, pivot, plane, saddle and condyloid
Hinge joint allows for
extension and flexion
Ball and socket joint allows for
flexion , extension and circumduction, adduction , abduction
pivot joint allows for
rotation only
saddle joint allows for
flexion , extension and circumduction, adduction , abduction
condyloid joint allows for
flexion , extension and circumduction, adduction , abduction
hinge joint example
knee, elbow
gliding joint allows for
sliding only
ball &socket joint example
hip, shoulder
pivot joint example
atlas and axis
plane joint example
carpals
plane =
gliding
saddle joint example
thumb
condyloid joint example
wrist
identify 3 types of connective tissue
cartilage, tendons and ligament
Structure of cartilage
specialised connective tissue that is avascular
Function of cartilage
shock absorption, joint lubrication and reduced friction
Example of cartilage
ears, nose, ribs, intervertebral discs
Identify 3 types of cartilage
hyaline , fibrous and elastic
Briefly outline types of cartilage
hyaline-all long bones
fibrous-strong
elastic-flexible (pinna)
Injury to ligaments
sprain
injury to tendon
strain
structure of ligaments
connect bone to bone
-string fibrous band of connective tissue
function of ligament
control moment and stabilise joints
Structure of fascicle
band of smooth muscle fibres
state types of skeletal muscle arrangement
bipennate, unipennate, multipennate, fusiform
Structure of tendons
connect muscle to bone, soft connective tissue
function of tendons
transfer force between muscle and bone to create movement
What is a muscle fibre
single muscle cell
Structure of sarcolema
plasma membrane of muscle cells
Structure of sarcoplasm
cytoplasm of muscle cell
Structure of sarcomere
longitudinal repeating unit of muscle cell
Function of sarcoplasmic reticulum
specialised smooth ER that stores, receives and releases Ca++
Outline siding filament theory
1.action potential arrives at neuromuscular joint
2. ach released
3.Na channel open
4.Ca++ release
5.myosin binds to actin
6.actin, myosin slide over each other
7.muscle fiber contracts
8.force through tendon
9.tendon pull on bone –> movement
Identify 3 types of muscle contraction
isometric, cocentric and eccentric
isometric muscle contraction is
muscle length does not change
cocentric muscle contraction is
muscle shortens
eccentric muscle contraction is
muscle lengthens
Active vs passive movements
active=effort exerted by individual + muscle mass increase
passive=no effort by individual + increase ROM