Zusammenfassung der Ressource
The Skeletal System
- Is made up of two parts
- The Axial Skeleton
- which consists of 80 bones along the midline of the
body.
- The Appendeciular
- which consists of 126 bones that make up our limbs.
- Bones themselves are categorized into five groups called
- the Long Bone
- an example being the humerus or femur.
- the Short
Bone
- Such as our fingers (phalanges).
- the Sesamoid Bone
- like our knee cap aka Patella.
- the Irregular Bone
- such as those that make up our spine.
- the Flat Bone
- which is the type of bone our skulls are.
- But what allows bones to move when muscles
pull on them?
- They move because of Joints. Humans have three types called:
- Fibrous
- which are unable to move.
- Cartilagenous
- Allow for slight movement, found within the spine.
- Synovial; which there are six kinds
of.
- Hinge Joint
- an example of this would be the elbow (the humerus and ulna)
- Ball and Socket joint
- an example of this would be the hip or shoulder joints
- Gliding joint
- which are found within the tarsals and carpals, in our feet and hands.
- Pivot joint
- an example of this would be the joint between the atlas and axis.
- Saddle Joint
- which is found in the thumb
- Ellipsoid joint
- which is found in the wrist
- What are the types of injuries that can happen to the skeletal system?
- Bones experience fractures which are divided into three types called:
- Simple fractures
- these are breaks on the surface of the bone while it is intact.
- an example would be stress fractures (over repeated use) or hairline fractures.
- Compound fractures
- these happen when the bone is split into two pieces.
- for example breaking your femur in half.
- Comminuted fractures
- which occur when the bone, or a part, is shattered.
- this happens commonly during major car accidents.
- Bones are also prone to disease such as osteoporosis.
- This is a degenerative condition that causes bones to become fragile and brittle.
- Women are more prone to this then men are but
- it can be combated with a balanced diet rich in calcium, weight bearing exercise, a healthy lifestyle (no smoking etc.).
- Joints experience different types of injuries called:
- Cartilage Damage.
- Cartilage is what reduces the damage bones would take while they move in their joints.
- This begins to wear out over our life span, but can also happen quickly causing sharp pains within the joint.
- Sprains.
- This occurs when the ligaments holding bones are overstretched.
- First degree means that only a few fibres were overstretched.
- Second degree means some fibres in the ligament tore.
- Third degree means the ligament is almost completely torn.
- Dislocations and Seperations.
- Dislocations occur when a bone leaves its joint.
- Seperations occur when ligaments holding bones together are torn.
- How do muscles attach to bone?
- Muscles attach on bones by way of tendons or attaching to the surface
of the bone. Not to be confused with ligaments which hold bones
together
- The place where a muscle attaches to the bone is known as a landmark