The Sketelal System - Weeblyfatimaphysed.weebly.com/.../8/7/0/38708281/the_sketelal_system_-_… ·...
Transcript of The Sketelal System - Weeblyfatimaphysed.weebly.com/.../8/7/0/38708281/the_sketelal_system_-_… ·...
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The Skeletal System
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Learning Objectives
Define the Skeletal system
State the function of the skeletal system
Describe the structure and workings of the skeletal system
Name the major bones
Identify the different types of joints found in the human body
Describe the effects of physical activity on the skeletal system
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What makes up the Skeletal System? It is made up of all the bones in the body. These include:
Cranium(Skull) Mandible(lower jaw bone) Clavicle(collarbone) Scapula(shoulder blade) Humerus(upper arm bone) Sternum(breastbone) Ribs Vertebral column(backbone) Radius and Ulna( forearm bones) Pelvis( hip bone) Carpals(wrist bones) Metacarpals(hand bones) Phalanges(fingers and toes) Femur( thigh) Patella(knee cap) Tibia(shin bone) Fibula Tarsals( ankle bones) Metatarsals(foot bones) Phalanges(toes)
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What are the functions of the Skeletal System?
To protect our internal organs
To manufacture blood cells
To support and give shape to the body
To facilitate movement with the help of muscles
To store minerals such as calcium and phosphorus
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How many bones are there in the human skeleton?
Parts of the Skeleton Number of Bones
Skull and upper jaw 21
Each ear has 3 tiny bones 6
Lower jaw 1
Front neck bone(hyoid) 1
Backbone or spine 26
Ribs(12 pairs) 24
Breastbone 1
Each upper limb has 3 bones:2 in shoulder,3 in arm,8 in wrist,19 in hand an fingers
64
Each lower limb has 31 bones:1 in hip, 4 in leg,7 in ankle,19 in foot and toes
62
Total 206 bones
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What are the different types of bones in the human skeleton?
There are four (4) different types of bones found in the human skeleton.
These are:
Long bones
Short bones
Flat bones
Irregular-shaped bones
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LONG BONES
Long bones have a thick outside layer of compact bone.
Inside the shaft is the marrow cavity with bone marrow.
The bone marrow manufactures blood cells.
The ends of long bones are made up of spongy bone.
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LONG BONES
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LONG BONES
The arms and legs consist of mostly long bones. The long bones are: Clavicle Radius
Metacarpals Femur Fibula
Humerus Ulna
Phalanges Tibia
Metatarsals
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SHORT BONES
Short bones contain mostly spongy bone with a thin layer of compact bone on the outer
surface.
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Which bones are short bones?
Short bones are the:
Tarsals
Carpals
Patellas
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FLAT BONES
Flat bones are made up of a layer of spongy bone between two thin layers of compact bone.
Flat bones are thin and have broad surfaces
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Which bones are flat bones?
The flat bones found in the body are:
Cranium
Sternum
Ribs
Pelvis
Scapula
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IRREGULAR-SHAPED BONES
These bones have several projections making an uncommon shape.
All bones in the spinal column are irregular bones.
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The Spine
The spine consists of lots of small irregular bones called vertebrae. Their function is to allow movement at the spine, provide an attachment for muscles and also to protect the spinal cord which runs through their centres. The spine is split into 5 sections:
Cervical
The cervical spine is the neck part of the spine and consists of 7 vertebrae
Thoracic
The thoracic spine is the upper back and consists of 12 vertebrae
Lumbar
The lumbar vertebrae forms the lower back and includes 5 vertebrae
Sacrum
The sacrum is the buttocks part of the spine and consists of 5 vertebrae, however they are fused and appear as a triangular bone, in between the two hip bones (ilium)
Coccyx
The coccyx is the very end of the spine and used to be our tail bones, although it now doesn't have a function.
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The bones of the human skeleton are divided into two groups. The axial skeleton includes all the bones (that form bony structures) along the body’s long axis. The bones of the appendicular skeleton make up the rest of the skeleton, and are so called because they are appendages of the axial skeleton.
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What are JOINTS?
Joints are the areas where bones meet.
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What are the different types of joints?
There are three different types of joints:
Fixed joints
Slightly moveable joints
Synovial or freely moveable joints
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Fixed Joints
A fix joint is where one bone is connected directly to another bone.
These joints do not allow movement.
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Where are fixed joints found?
Fixed joints can be found in the:
Skull and
Pelvis
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Slightly-moveable Joints
The bones of these joints are separated by a layer of cartilage.
These joints allow limited movement.
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Where are these joints found?
This type of joint is found in the :
Spine
Ribs
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Synovial or freely moveable joints
The area between the bones of a synovial joint is filled with synovial fluid.
Synovial fluid helps to lubricate and protect the cartilage-covered ends of the bones.
These bones are held together by ligaments(stretchy bands of fibrous tissue).
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Types of synovial joints
There are 6 types of freely moveable joints:
Ball and socket
Hinge
Gliding
Pivot
Saddle
Condyloid
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Ball and Socket Joints
These joints allow movement in almost any direction.
Examples:
hips and
Shoulders
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Hinge Joints
These joints allow extension and flexion.
Examples:
Elbows
Knees
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Gliding joints
• In a gliding joint, bones slide past each other.
• Examples:
• Carpal(wrist)
• Tarsal(ankle)
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Pivot Joints
This joint has the Rotation of one bone around another.
Examples
-Top of the neck (atlas and axis bones)
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Saddle Joints
These allow movement back and forth and up and down but does not allow rotation like a ball and socket.
Example:
The thumb
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Condyloid Joints
These allow up and down movement and side to side movement.
Example:
Wrist joint
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Diseases and disorders of the Skeletal System
The most common include:
Sprains
Fractures
Scoliosis
Kyphosis
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Sprains
Definition:
This is an injury to a ligament or to a tissue that covers a joint.
Cause:
The forceful twisting of the bones of a joint in any direction in which they would not normally move or further than they should move
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Sprains
Signs:
Pain
Swelling
Discolouration
Treatment:
The RICE method can be done to treat sprains.
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The R.I.C.E. method R-Rest the affected joint.Do not move the
affected joint around and limit its use.
I-Ice the affected joint.This should be done as soon as possible after the sprain.This helps reduce swelling
C-Compress the area as this helps to reduce swelling and gives support to the joint.This can be done by wrapping the joint with a bandage.
E-Elevate the affected joint.This allows blood to flow back to the heart instead of pooling at the affected areas which would worsen the swelling.
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Fractures
A fracture is a broken bone.
The common kinds are :
Closed
Open
Multiple
Comminuted
Greenstick
Spiral
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Some Common types of Fractures
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Scoliosis
This is the sideward curve of the spine.
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Scoliosis
This condition causes the patient to experience discomfort and pain when standing straight.
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Kyphosis
This is the forward bending of the spine so that the patient appears to be leaning forward.
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What are the effects of exercise on the Skeletal System?
Bones become stronger in order to deal with the stress placed on them from exercise.
The cartilage at the ends of bones becomes thicker are better at absorbing shock.
Tendons become thicker and more capable of withstanding greater force.
Ligaments will stretch slightly to enable greater flexibility at the joint.
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THE END