the skeletal system, a presentation for grade elevens
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SUPPORT SYSTEMS IN
ANIMALS
A PRESENTATION FOR GRADE 11S
EXOSKELETON
• SOME INVERTEBRATES HAVE HARD EXTERNAL STRUCTURES FOR :
1.MAINTAINING THEIR SHAPE
2.SUPPORTING THEIR BODIES
3.PROTECTING THEIR INTERNAL BODY ORGANS
4.AIDING MOVEMENT
• THE HARD EXTERNAL STRUCTURES ARE CALLED EXOSKELETONS
• THE EXOSKELETONS CONSISTS OF A HARD SUBSTANCE CALLED CHITIN
HYDROSTATIC SKELETON
• INVERTEBRATES WITH SOFT BODIES HAVE BODY FLUIDS TO PROVIDE THEM WITH SHAPE AND SUPPORT
• THE BODY FLUIDS EXERT A PRESSURE ON THEIR BODY WALLS TO FORM A HYDROSTATIC SKELETON
• THE HYDROSTATIC SKELETON HAS THE FOLLOWING FUNCTIONS :
1.PROVIDES SUPPORT
2.MAINTAINS BODY SHAPE
3.AIDS MOVEMENT
EXOSKELETON• AQUATIC INVWERTEBRATES SUCH AS PRAWNS, CRABS,
COCKLES AND SNAILS ARE SUPPORTED BY HARD EXOSKELETON
• THE EXOSKELETONS ARE VERY HARD BECAUSE THEY CONTAIN CALCIUM
HYDROSTATIC SKELETON• AQUATIC INVERTEBRATES
SUCH AS THE STARFISH AND THE JELLYFISH ARE SUPPORTED BY A HYDROSTATIC SKELETON
• THE FLUID PRESSURE IN THEIR BODIES GIVES THEM SUPPORT AND SHAPE
The Skeletal SystemThe Skeletal System The skeletal system consists of:
Bones (skeleton)
Joints
Cartilages
Ligaments (connect bone to bone)
tendon=( connect bone to muscle)
Divided into two parts
Axial skeleton
Appendicular skeleton – limbs and girdle
Functions of BonesFunctions of Bones
Support then weight of the body
Give the body its structure and shape
Protection of soft organs
Movement due to attached skeletal muscles
Storage of minerals and fats
Blood cell production
Bones of the Human BodyBones of the Human Body
The skeleton has 206 bones
Two basic types of bone tissue
Compact bone
Homogeneous
Spongy bone
Small needle-like pieces of bone
Many open spaces
Bones are classified by their shape.
There are:1.long 2.short 3.flat 4.irregular bones.
Classification of Bones on the Classification of Bones on the Basis of ShapeBasis of Shape
Gross Anatomy of a Long BoneGross Anatomy of a Long Bone
Diaphysis
Shaft
Composed of compact bone
Epiphysis
Ends of the bone
Composed mostly of spongy bone
A Microscopic View of the BoneA Microscopic View of the Bone
Structures of a Long BoneStructures of a Long Bone Periosteum
Outside covering of the diaphysis
Fibrous connective tissue membrane
Sharpey’s fibers Secure periosteum to
underlying bone
Arteries Supply bone cells
with nutrients
Types of Bone CellsTypes of Bone Cells Osteocytes
Mature bone cells
Osteoblasts Bone-forming cells
Osteoclasts Bone-destroying cells
Break down bone matrix for remodeling and release of calcium
Bone remodeling is a process by both osteoblasts and osteoclasts
Bone FracturesBone Fractures
A break in a bone
Types of bone fractures
Closed (simple) fracture – break that does not penetrate the skin
Open (compound) fracture – broken bone penetrates through the skin
Bone fractures are treated by reduction and immobilization
Realignment of the bone
Common Types of FracturesCommon Types of Fractures
Axial skeleton supports and protects organs of head, neck and trunk Axial skeleton:• skull (cranium and facial bones)• hyoid bone (anchors tongue and muscles• associated with swallowing)• vertebral column (vertebrae and disks)• bony thorax (ribs and sternum) Appendicular skeleton includes bones of limbs and
bones that anchor them to the axial skeletonAppendicular skeleton:• pectoral girdle (clavicles and scapulae)• upper limbs (arms)• pelvic girdle (sacrum, coccyx)• lower limbs (legs)Articulation- where joints meet, connect, and are formed.
• 22 bones in skull• 6 in middle ears• 1 hyoid bone• 26 in vertebral
column• 25 in thoracic cage
• 4 in pectoral girdle• 60 in upper limbs• 60 in lower limbs• 2 in pelvic girdle
• 206 bones in all
The Axial SkeletonThe Axial Skeleton
Forms the longitudinal part of the body
Divided into three parts
Skull
Vertebral column
Bony thorax
The Axial SkeletonThe Axial Skeleton
The skull
8 sutured bones in craniumFacial bones: 13 sutured bones, 1 mandible
Craniumencases brainattachments for musclessinuses
Bones of the Skull
Allows forgrowth
The Vertebral ColumnThe Vertebral Column
Vertebrae separated by intervertebral discs
The spine has a normal curvature
Each vertebrae is given a name according to its location
Vertebral column
7 cervial vertebrae12 thoracic5 lumbar1 sacrum (5 fused 1 coccyx (4 fused)
Vertebrae vary in size and morphology
Structure of a Typical VertebraeStructure of a Typical Vertebrae
Thoracic cage• ribs• thoracic vertebrae• sternum• costal cartilages
True ribs are directly attached to the sternum(first seven pairs)Three false ribs are joined to the 7th ribTwo pairs of floating ribs
JOINTS• FIBROUS- CONNECT BONES WITHOUT ALLOWING
ANY MOVEMENT. BONES OF THE SKULL AND PELVIS.
• CARTILAGINOUS- THE BONES ARE ATTACHED BY CARTILAGE. ALLOW FOR ONLY A LITTLE MOVEMENT, SPINE OR RIBS.
• SYNOVIAL- MORE MOVEMENT. CAVITIES BETWEEN BONES IN SYNOVIAL JOINTS
ARE FILLED WITH SYNOVIAL FLUID. FLUID LUBRICATES AND PROTECTS THE BONES.
BURSA SACKS CONTAIN THE SYNOVIAL FLUID WITHIN FIXED LIMITS
• A JOINT, OR ARTICULATION, IS THE PLACE WHERE TWO BONES COME TOGETHER.
• THERE ARE THREE TYPES OF JOINTS CLASSIFIED BY THE AMOUNT OF MOVEMENT
• THEY ARE:
IMMOVABLE SLIGHTLY MOVABLE FREELY MOVABLE
TYPES OF JOINTS
HINGE- A HINGE JOINT ALLOWS EXTENSION AND
RETRACTION OF AN APPENDAGE. (ELBOW,
KNEE)
BALL AND SOCKET- A BALL AND SOCKET JOINT ALLOWS
FOR RADIAL MOVEMENT IN ALMOST ANY DIRECTION.
THEY ARE FOUND IN THE HIPS AND SHOULDERS. (HIP,
SHOULDER)
GLIDING- IN A GLIDING OR PLANE JOINT BONES
SLIDE PAST EACH OTHER. MID-CARPAL AND MID-
TARSAL JOINTS ARE GLIDING JOINTS. (HANDS,
FEET)
SADDLE- THIS TYPE OF JOINT OCCURS WHEN THE TOUCHING SURFACES OF TWO BONES HAVE BOTH CONCAVE AND CONVEX REGIONS WITH THE SHAPES OF THE TWO BONES COMPLEMENTING ONE OTHER AND ALLOWING A WIDE RANGE OF MOVEMENT. (THUMB)
Structures Associated with the Structures Associated with the Synovial JointSynovial Joint Bursae – flattened fibrous sacs
Lined with synovial membranes
Filled with synovial fluid
Not actually part of the joint
Tendon sheath
Elongated bursa that wraps around a tendon
The Synovial JointThe Synovial Joint
Types of Synovial Joints Based on Types of Synovial Joints Based on ShapeShape
Types of Synovial Joints Based on Types of Synovial Joints Based on ShapeShape
DISEASES AND CONDITIONS
OF THE SKELETAL SYSTEM
ARTHRITIS
OSTEOPOROSIS• MEANS "POROUS BONES."
• BONES HAVE LOST MINERALS
(ESPECIALLY CALCIUM) MAKING THEM
WEAK, BRITTLE, AND SUSCEPTIBLE TO
FRACTURES
• MOST COMMON PLACES WHERE
FRACTURES OCCUR ARE THE BACK,
HIPS, AND WRISTS.
TENDONITIS• INFLAMMATION OF THE TENDON.
• MOVEMENT BECOMES PAINFUL.
• MOST COMMON CAUSE OF TENDONITIS IS
OVERUSE.
RICKETS
• SOFTENING AND WEAKENING OF BONES
IN CHILDREN
• USUALLY BECAUSE OF AN EXTREME AND
PROLONGED VITAMIN D DEFICIENCY.
GOUT• RESULTS FROM AN OVERLOAD OF URIC
ACID IN THE BODY.
• LEADS TO THE FORMATION OF URATE CRYSTALS THAT DEPOSIT IN THE JOINTS.
• CRYSTALS IN THE JOINTS CAUSES RECURRING ATTACKS OF JOINT INFLAMMATION (ARTHRITIS).
• CHRONIC GOUT MAY CAUSE JOINT DESTRUCTION, DECREASED KIDNEY FUNCTION, AND KIDNEY STONES.
REFERENCES• HTTP://BESTCLIPARTBLOG.COM/22-SKELETON-CLIP-
ART.HTML/SKELETON-CLIP
• RANUM, M. J. (2008). BONES. AVAILABLE FROM: HTTP://MJRANUM-STOCK.DEVIANTART.COM/ART/BONES. ACCESSED: 7 MARCH 2014
• ERASMUS, B. (2012). ANIMAL SUPPORT SYSTEM. AVAILABLE FROM: HTTP://WWW.SLIDESHARE.NET/B_ERASMUS/ANIMAL-SUPPORT-SYSTEM. ACCESSED: 7 MARCH 2014
• SEVC, T. K. (2014). SKELETAL SYSTEM. AVAILABLE FROM: HTTP://WWW.SLIDESHARE.NET/MRSSEVCTK/SKELETAL-SYSTEM. ACCESSED: 7 MARCH 2014
• KAHN, M.T. [N.D.]. THE SKELETAL SYSTEM. AVAILABLE FROM: HTTP://WWW.SLIDESHARE.NET/IQBAL1313/THE-SKELETAL-SYSTEM. ACCESSED: 7 MARCH 2014