1 the musculoskeletal system 2 objectives name the parts of the musculoskeletal system and discuss...
TRANSCRIPT
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THE MUSCULOSKELETAL SYSTEM
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ObjectivesObjectives
• Name the parts of the musculoskeletal system and discuss the function of each part.
• Define combining forms used in building words that relate to the musculoskeletal system.
After studying this chapter, you will be able to:
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Objectives Part 2Objectives CONT’D
• Name the common diagnoses, laboratory tests, and clinical procedures used in treating the musculoskeletal system.
• Define the major pathological conditions of the musculoskeletal system.
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Objectives Part 3 Objectives CONT’D
• Define surgical terms related to the musculoskeletal system.
• List common pharmacological agents used in treating the musculoskeletal system.
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Ch 5 Vocabulary
• Acetabul(o)• Brachi(o)• Burs(o)• Calci(o)• Cervic(o)• Cost(o)• Dactyl(o)• Femor(o)• Fibr(o)• Kyph(o)
• Lamin(o)• Lumb(o)• Myel(o)• Patell(o)• Ped(i)• Radi(o)• Scapul(o)• Stern(o)• Synov(o)• Uln(o)
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Structure and FunctionForms the body framework
Enables the bodyto move
Protects and supports internal organs
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Bones
Bones
• Consists of a rich supply of blood vessels and nerves
• Osteoblasts are bone-forming cells
• Osteoclasts are responsible for reabsorbing dead bone tissue
• Bone cells are called osteocytes
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OssificationBones
The development of osteocytes and the hardening process is called ossification.
calcium
phosphorusvitamin D
Ossification depends on:
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Divisions of the Skeleton
• Axial– Skull– Spinal column– Ribs– Sternum
• Appendicular– Upper & lower
extremities– Pelvic girdle
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Common Bone CategoriesBonesThe adult skeleton has 206 bones.
Common Bone Categories• Long bones(Femur)
• Short bones(Wrist bones)
• Flat bones(Skull)
• Irregular bones(Vertebrae/Facial)
• Sesamoid bones(Kneecap)
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Parts of the Long Bone
• Diaphysis– Shaft or longest portion– Compact bone
• Hard dense part of bone that does not bend
– Spongy bone• Covers medullary cavity
• Epiphysis– Ends of long bone– Epiphyseal plates: growth
plates– Contains red marrow
Femur
Distal epiphysis
Diaphysis
Proximal epiphysis
Epiphyseal disksSpongy boneArticular
cartilage
Space containing red marrow
Compact bone
Medullary cavity
Yellow marrow
Periosteum
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Parts of the Long Bone
• Medullary cavity– Hollow space– Contains yellow marrow
• Tissues of a bone– Periosteum-outer covering
of bone– Endosteum-lines medullary
cavity
Femur
Distal epiphysis
Diaphysis
Proximal epiphysis
Epiphyseal disksSpongy boneArticular
cartilage
Space containing red marrow
Compact bone
Medullary cavity
Yellow marrow
Periosteum
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Parts of Long Bones
• Bone marrow– Red bone marrow
• Manufactures erythrocytes & leukocytes
– Yellow bone marrow• Composed of fat cells • Functions as fat storage
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Parts of Long Bones Part 2 • Articular cartilage is a thin flexible substance that provides protection at movable points.
Parts of a Long Bone
Femur
Distal epiphysis
Diaphysis
Proximal epiphysis
Epiphyseal disksSpongy boneArticular
cartilage
Space containing red marrow
Compact bone
Medullary cavity
Yellow marrowPeriosteum
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Bones of the Skull
• Cranium: encloses the brain (skull)– Frontal
• forehead– Parietal
• Roof and upper sides of cranium
– Occipital• Posterior floor and
walls of cranium– Temporal
• Sides and base of cranium
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Bones of the Jaw
• Mandible– Lower jaw bone
• Maxilla– Upper jaw bone
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Sutures
• Where cranial bones join & fuse
• Fontanelles:– Soft spots on infant
skull
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SinusesCavities that reduce the weight of a bone.
• Frontal sinuses
• Ethmoid sinuses
• Maxillary sinuses
• Sphenoid sinuses
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Spinal ColumnSpinal Column
Consists of five sets of vertebrae
• Cervical = 7
• Thoracic = 12
• Lumbar = 5
• Sacrum = 5 fused
• Coccyx = 4 fused
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Thoracic cavity
• Ribs– 12 pairs
• Called costals• Attach posterior to thoracic
vertebrae– 7 pairs
• True ribs• Attached anterior to sternum
– 3 pairs• False ribs• Attached anterior to cartilage• Joins with sternum
– 2 pairs• Floating ribs• Not attached anteriorly
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Thoracic Cavity
Sternum:– Manubrium
• Upper portion of sternum
– Body of sternum• Middle portion of
sternum– Xiphoid process
• Cartilage• Lower portion of
sternum
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Shoulders
• Clavicle– Collar bone– Connects sternum
• Scapula– Shoulder blade
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Pelvic girdle HIPS
• Ilium– Upper blade shape
• Ischium– Lower portion near
hips
• Pubic bone– Fuse together with
sacrum
• Pubic symphysis– Cartilage joint that
holds bones together
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Bones of the ExtremitiesBones of the Extremities
Upper Arm• Humerus
Lower Arm• Ulna• Radius
Hand and Fingers• Carpals (wrist)• Metacarpals (palm)• Phalanges (fingers)
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Bones of the Extremities Part 2Bones of the Extremities (Cont’d)
Upper Leg
• Femur (thigh)
Lower leg• Tibia (shin)• Fibula (little fibber)• Patella (kneecap)
Feet and Toes
• Tarsals (ankle)• Calcaneus (heel)• Metatarsals (arch)• Phalanges (toes)
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Joints
Joints (articulations)
Amphiarthroses• Moves slightly• Vertebrae
Diarthroses
• Moves freely• knee
Synarthroses• No movement• Skull
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Freely Moveable Joints
• AKA: Synovial joints• Lined with a synovial
membrane• Synovial fluid
– A joint lubricator– Helps synovial joints move
easier
• Bursa– Sac lined with synovial
membrane– Helps reduce friction
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Tendons and LigamentsTendons are bands of fibrous tissue that connect muscles to bone.Ligaments connect bones to other bones.
Tendons and Ligaments
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Muscles - FasciaMusclesMost muscles are covered by a band of connective tissue called fascia, that covers & supports the muscle.
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MusclesMusclesMuscles contract (shorten) and extend to provide body movement.
Types of Muscles
• Voluntary (striated)• skeletal
• Involuntary • smooth or visceral- Move
internal organs• Cardiac (striated)
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• Origin-– Attachment to a stationary bone
• Insertion-– Attachment to a movable bone
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Muscles – Origin or InsertionLift up your right forearm to flex your bicep brachii as if making a fist. Identify the origin and insertion attachment by agreeing with one of the following statements:
The radius is the origin and the scapula is the insertion.
The scapula is the origin and the radius is the insertion.
---OR---
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Diagnostic, Procedural, and Laboratory Terms
• Arthrography– Examine joints using
x-ray
• Arthroscopy– Internal exam of a joint
using an instrument
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Diagnostic, Procedural, and Laboratory Terms
• Diskography– Exam of disks by
injection of dye then an x-ray
• Electromyogram– Image of electrical
activity of muscles
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Diagnostic, Procedural, and Laboratory Terms
• Computerized tomography (CT)– Multiple X-rays– Computer puts in cross
sectional views
• Magnetic resonance imaging (MRI)– Magnets excite H ions– Computer makes pic
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Diagnostic, Procedural, and Laboratory Tests Pt 5
Other Tests
Goniometer-Tests for ROM
Densitometer-Measures bone density
Goniometer
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PathologyCauses of musculoskeletal disorders
• Birth defects
• Injury
• Degenerative disease
• Systemic disorders
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• Spina bifida– Incomplete closure of
spinal cord & protrusion-meningocele
Pathology-Birth Defects
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Pathology-Birth Defects
• Talipes– AKA: club foot– congenital deformity
of the foot – curled shape or twisted
position of the ankle, heel & toes
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Pathology-Injuries
• Herniated disk– Disk is compressed &
protrudes– Presses on nerve
causing sciatica– Pain radiates from butt
down leg to foot/toes
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Pathology-Injuries
• Fractures– Incomplete fracture
• Fracture line doses not extend through bone or disrupt the entire thickness of bone
– Greenstick fracture• Incomplete break that
occurs almost exclusively in children
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Pathology-Injuries
• Fractures, cont.– Comminuted fractures
• Bone broken in several places and splinters of bone can be embedded in surrounding tissue
– Compression fracture• Bone collapses due to
disruption of bone tissue
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Pathology-Injuries
• Fractures, cont– Compound:
• Causes disruption of skin and soft tissue
• Fragment of bone punctures skin
• Often complicated by infection
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Pathology-Injuries• Injury or trauma to the
joints or muscle may cause a sprain.
• Overuse of a muscle may cause a strain.
• Tendinitis: overuse of a joint
• Dislocation: when bones in a joint become displaced or misaligned
• Subluxation: partial dislocation
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Pathology-Pain & Discomfort
• Myalgia: muscle pain• Myositis: muscle
inflammation• Arthritis:
inflammation of joints– Arthralgia: joint pain– Ankylosis: stiff joints– Osteoalgia- bone pain
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Pathology-Abnormal Muscle Tone
• Hypertrophy: abnormal increase in muscle size
• Atrophy: muscles shrink in size from disuse
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Pathology-Abnormal Muscle Tone
• Spasms: abnormal contractions
• Rigor: abnormal muscle stiffness
• Tetany: painfully long spasm
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Pathology-Abnormal Postures
• Kyphosis– Rounded bowing of
back at thoracic area
• Scoliosis– Lateral curvature of
spine
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Pathology-Abnormal Postures
• Lordosis– Abnormal inward
curvature of lumbar vertebrae
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Surgical TermsAlmost any major part of the musculoskeletal system can now be surgically repaired.
Supportive devices
• Cast
• Splints
• Traction
• Prosthetic devices
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Surgical Terms
External fixation – Splints or casts
Internal fixation – Pins or rods
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Surgical Terms
• Reduction: return of a part to normal position
• Open reduction: done surgically
• Closed reduction: external manipulation of dislocated bones
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Surgical Terms
• Traction– Aligns ends of a
fracture by pulling the limb into a straight position
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Surgical Terms
• Amputation– Surgical removal of
limb– Prosthesis replaces
limb or joints
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Surgical Terms
• Osteoplasty: surgical repair of bone• Osteoclasis: breaking of bone when not healed
properly• Osteotomy: incision into a bone• Tenotomy: cutting of tendon to repair muscle• Myoplasty: muscle repair• Arthroplasty: joint repair• Arthrocentesis: puncture of a joint
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Surgical Terms
• Bunionectomy– Removal of bunion on
hallux
• Laminectomy– removes parts of the
vertebrae) that is narrowing the spinal canal and squeezing the spinal cord and nerve roots.
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Pharmacology Part 2Common medications for the Musculoskeletal System
• Analgesics- relieves pain
• Steroids- reduce inflammation
• Muscle Relaxants- relieve stiffness
• NSAID’s- Non-steroidal anti-inflammatory drugs
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Apply Your KnowledgeMrs. Jones is concerned with the “soft spots” she feels on her baby’s head. You realize the medical term for these “soft spots” is:
A. FontanelleB. FissureC. Foramen
A. Fontanelle
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Apply Your Knowledge Part 2Head & Trunk
Arms & Legs
Identify the axial and appendicular portions of the skeleton.
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Apply Your Knowledge Part 3Mary is complaining of headache, stuffy nose and pressure with facial discomfort. Her physician tells her she has allergies. Which of the following conditions might she be experiencing?
A. fracture of her vomerB. sinusitisC. stroke
B. sinusitis
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Apply Your Knowledge Part 4Relieves pain
Reduces swelling
Relieves stiffness
1
2
3
A. steroids
B. analgesics
C. muscle relaxants
Match the correct medication with its action.
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Combining Forms Match the following combining forms and meanings.
ankyl (o)
arthr (o)
brachi (o)
calcane (o)
heel
bent
joint
arm
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Combining Forms Part 2Match the following combining forms and meanings.
carp (o)
cephal (o)
chondr (o)
dactyl (o)
kyph (o)
cartilage
hump
head
wrist
fingers, toes
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Combining Forms Part 3Match the following combining forms and meanings.my (o)
myel (o)
pod (o)
oste (o)
phalang (o)
foot
finger or toe bone
muscle
bone
spinal cord; bone marrow
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Combining Forms Part 4Match the following combining forms and meanings.
rachi (o)
scoli (o)
spondyl (o)
ten (o)
uln (o)
curved
vertebra
spine
ulnar
tendon