muskuloskeletal system...title muskuloskeletal system author erika sulik created date 6/18/2020...
TRANSCRIPT
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Muskuloskeletal System
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Musculoskeletal SystemAs we already mentioned, for movement to happen we
need muscles and we need bones!
There are 206 different bones in the human body!
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Musculoskeletal System
Our skeleton provides the body with 5 main functions:
- Movement
- Support
- Protection
- Production of blood cells
- Storage
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FunctionsMovement
Bones give structure to our limbs and can therefore
act as levers that the muscles pull on to allow for
movement
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FunctionsSupport
Bone’s rigid and sometimes flexible structure gives
our body shape and provides anchor points for our
muscles to attach to
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FunctionsProtection
In addition to support, many bones act as hard
barriers to protect fragile internal organs
Ex: the skull protects the brain; the ribs protect the
lungs, heart, etc.
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FunctionsProduction of Blood Cells
The bone marrow that is found in some types of bones
is where the blood components such as the RBC,
WBC and platelets are formed
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FunctionsStorage
The hard tissues of bones help to store minerals such
as calcium and phosphorous while the internal
cavities store fats.
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Bone Types
What is bone?
- A hard solid organ that forms part of the skeleton
- It is the hardest substance in the human body
- Mostly made up of bone cells
- These cells are continuously renewed, even in
adults
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Bone Types
There are 2 main types of bone:
- Compact bone
- This type of bone is very dense
- Spongy bone
- This type of bone has lots of little cavities like
the pores in a sponge
The different bones in the body contain varying
amounts of compact and spongy bone
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Categories of Bone
The bones in the body come in a number of different
shapes and sizes ranging from the tiny ossicles in the
ear, to the largest bone in the body: the femur.
There are 4 main categories of bone:
- Long bones
- Short bones
- Flat bones
- Irregular bones
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Categories of Bone
Long Bones
- These bones are longer than they are wide
- Have a thin shaft called the diaphysis and two
rounded ends called the epiphyses
- Made mostly of compact bone with marrow in the
middle
- Examples: femur, humerus
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Categories of Bone
Short Bones
- These bones are almost cubic in shape
- Made mostly of spongy bone
- Found primarily in the wrists and heels
- Examples: carpals
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Categories of Bone
Flat Bones
- These bones are thin and flat; sometimes curved
- Like a sandwich: two layers of compact bone with
spongy bone in between
- Examples: skull and ribs
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Categories of Bone
Irregular Bones
- Have a shape that does not fall into the other 3
categories
- Examples: vertebrae
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Skull
Cervical vertebrae
Sternum
Xiphoid process
Lumbar vertebrae
Ilium
Sacrum
Coccyx
Pubis
Femur
Patella
Orbital cavity
Nasal cavity
Clavicle
Scapula
Rib
Humerus
Ulna
Radius
IschiumCarpals
Metacarpals
Phalanges
Fibula
Tibia
Tarsals
Metatarsals
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Body Joints
The different bones of the body are connected in
various ways:
- These bones need to be held together firmly and
also provide mobility where necessary
- This junction between two bones is called the joint
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Types of Joints
There are different types of joints depending on the
needs of the bones in question:
- Fixed joints (fibrous)
- Semi-movable (cartilaginous)
- Freely-movable (synovial)
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Types of Joints
Fixed joints (fibrous)
- Like the bones in the skull
- The bones are only held together by a ligament
- There is no movement between the bones
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Types of Joints
Semi-movable (cartilaginous):
- Like the joints between the vertebrae
- Connected using cartilage
- Provides some flexibility to allow for some
movement but not a lot
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Types of Joints
Freely-movable (synovial):
- Allow for a much wider range of motion
- Most joints fall into this category
- There is synovial fluid between the joints to ease
the movement and cartilage on the ends of the
bones to cushion them
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Types of Joints
Freely-movable (synovial):
- 4 main types of synovial joints:
- Hinge
- Pivot
- Ball and socket
- Saddle
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Types of Joints
Freely-movable (synovial):
- Hinge joint:
- The convex end of one bone moves within the
concave end of another
- Can bend and straighten only
- Think of the hinge on a door
- Example: elbow
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Types of Joints
Freely-movable (synovial):
- Pivot joint:
- The rounded part of a bone sits
within a ring
- The bone can rotate within the
ring
- Example: the neck
(vertebrae)
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Types of Joints
Freely-movable (synovial):
- Ball and socket:
- The rounded end of a bone fits into the concave
end of another bone
- This allows for the widest range of motion
- Example: the shoulder
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Types of Joints
Freely-movable (synovial):
- Saddle:
- Both bones involved have a saddle shape
- Concave in one direction and convex in the
other
- Example: the thumb
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Other Connectors
- Ligaments
- Band of very fibrous, tough but flexible tissue that
holds together 2 bones (or cartilage)
- Tendons
- A strong, fibrous and flexible (but not elastic)
cord that attaches muscle to bone
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Other Connectors
- Cartilage
- A firm connective tissue that is softer, more
flexible than bone and somewhat elastic
- Often used to keep tubes open (ex: trachea)
- Cushions joints
- Cartilage has no nerves or blood vessels
- Gets nutrition through diffusion
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Problems of the Skeletal System
- Fracture
- This is when there is a complete or
partial break in the bone
- It could even be broken in several
places
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Problems of the Skeletal System
- Dislocation
- When there is an abnormal
separation of bones at a joint
- Often occurs after a sudden
trauma (fall or impact)
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Problems of the Skeletal System
- Sprain
- Damage to the ligaments at a joint
- It could be stretched or even torn
- Strain
- Stretched or torn muscle or tendon
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Problems of the Skeletal System
- Arthritis
- Inflammation at the joints
- Osteoarthritis is a result of wear-and-tear to
the cartilage at the joints
- Rheumatoid arthritis is when the body’s
immune system attacks the lining (synovial
membrane) of the joints
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Problems of the Skeletal System
- Scoliosis
- A condition where a person’s spine has a
sideways curve
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Problems of the Skeletal System
- Osteoporosis
- A disease due to low bone mass and the
deterioration of bone tissue
- Increases the risk of fracture
- The best defense against osteoporosis is to
build strong bones as a child and adolescent!