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Long Bone
- Cylindric with rounded ends
- Often bear weight
- ex. femur
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Short Bone
- small
- bear little or no weight
- ex. phalanges
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Flat Bone
- protect vital organs
- often contain blood-forming cells
- ex. scapula
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Irregular Bones
- unique shapes
- ex. carpal bones of wrist, small bones of inner ear
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Sesamoid Bone
- least common type
- develops within a tendon
- ex. patella
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Cortex (Bone)
- outer layer of bone
- dense, compact bone tissue
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Medulla (Bone)
- inner layer of bone
- spongy, cancellous tissue
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Diaphysis
the shaft (elongated cylindrical portion) between the ends of a long bone
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Epiphyses
the two knoblike ends of a long bone
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Haversian System
- complex canal network containing microscopic blood vessels that supply nutrients and oxygen to bone and lacunae
- canals run vertically within the hard, cortical bone tissue
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Lacunae
small cavities that house osteocytes (bone cells)
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Cancellous
the softer tissue inside bones that contains large spaces (trabeculae) that are filled with red and yellow marrow
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Hematopoiesis
- production of blood cells
- occurs in red marrow of bones
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Volkmann's Canals
connect bone marrow vessels with the haversian system and periosteum
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Osteoblast
- bone-forming cells
- (type of osteogenic cell)
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Osteoclast
- bone-destroying cells
- (type of osteogenic cell)
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Matrix ("Osteoid")
- collagen, mucopolysaccharides, lipids
- deposits of inorganic calium salts (carbonate & phosphate) provide hardness of bone
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Some Facts about Bone
- very vascular tissue
- blood flow 200-400 mL/min
- main nutrient arterty, branches into ascending/descending vessels, supplies cortex/marrow/haversian system
- few nerve fibers
- Sympathetic Nerve Fibers: dilation of blood vessels
- Sensory Nerve Fibers: pain signals
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Function of Skeletal System:
- Framework: allows body to be weight-bearing, upright
- Support Surrounding Tissues: (ex. muscle, tendon)
- Assists in Movement: thru muscle attachment, joint formation
- Protects Vital Organs: (ex. heart, lungs)
- Makes Blood Cells: in red bone marrow
- Stores Mineral Salts: (ex. calcium, phosphorous)
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Resorption (Bone)
- loss of bone minerals and density
- release of free calcium from bone storage sites directly into the ECF
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Calcitonin
- produced by thyroid gland
- decreases serum Ca concentration
- inhibits bone resorption
- increases renal excretion of Ca and PO as needed to maintain balance
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Vitamin D
- produced in body, transported in blood
- promotes absorption of Ca and PO from small intestine
- enhance PTH activity to release calcium from bone
- deficiency can cause osteomalacia (softening of bone)
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Parathyroid Hormone (PTH)
- (feedback loop system)
- Low Serum Calcium:
- ↑secretion, stimulates bone to promote osteoclastic activity, release Ca into blood
- ↓ renal excretion of Ca, facilitates absorption from intestine
- High Serum Calcium:
- ↓ secretion to preserve bone Ca supply
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Growth Hormone
- secreted by anterior lobe of pituitary gland
- increases bone length, determines amt of bone matrix before puberty
- Childhood Increase: gigantism
- Childhood Decrease: dwarfism
- Adult Increase: acromegaly (bone & soft tissue deformities)
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Adrenal Glucocorticoids
- regulate protein metabloism
- ↑ or ↓ catabolism to reduce or intensify the organic matrix of bone
- aid regulation of intestinal Ca/PO absorption
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Estrogens & Androgens
- Estrogen: stimulates osteoblastic (bone-building) activity, inhibits PTH
- Androgen: [ex. testosterone] promotes anabolism (body tissue building), increase bone mass
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Thyroxine & Insulin
- Thyroxine: secreted by thyroid gland to increase rate of protein synthesis in all types of tissue
- Insulin: works w/growth hormone to build & maintain healthy bone tissue
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Distinguish these joints and provide examples of each: Synarthrodial, Amphiarthrodial, Diarthrodial (Synovial)
- Synarthrodial: completely immovable [ex. in the cranium]
- Ampiarthrodial: slightly movable [ex. in the pelvis]
- Diarthrodial (Synovial): freely movable [ex. elbow & knee]
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Synovial Joint (Diarthrodial): Ball-and-Socket, Hinge, Condylar, Biaxial, Pivot
- most common type in body
- most commonly affected by disease
- lined with synovium [membrane secretes fluid for lubrication & shock absorption]
- Ball-and-Socket: [shoulder, hip] movement in any direction
- Hinge: [elbow] motion in one plane, flexion, extension
- Condylar: [knee] flexion, extension, rotates slightly
- Biaxial: [wrist] gliding movement
- Pivot: [radioulna] rotation only
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Bursae
- small sacs lined w/synovial membrane
- located at joints & bony prominences
- prevent friction btwn bone & surrounding structures
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Types of muscle: Smooth, Cardiac, Skeletal
- Smooth: non-striated, involuntary, autonomic nervous system, contracts organs & blood vessels
Cardiac: striated, involuntary, autonomic nervous system - Skeletal: striated, voluntary, central & peripheral NS, fxn is movement
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Motor End Plate
junction of a peripheral motor nerve and the muscle cells that it supplies
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Fascia
- dense, fibrous tissue that surrounds the entire muscle
- contains the muscle's blood, lymph, and nerve supply
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Tendons vs. Ligaments
- Tendons: bands of tough, fibrous tissue that attach muscles to bones
- Ligaments: attach bones to other bones at joints
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Musculoskeletal Changes Assoc. w/ Aging
- Osteopenia: decreased bone density (bone loss), osteoporosis is severe osteopenia
- Synovial Joint Cartilage: less elastic and compressible, damaged cartilage leads to OA
- Muscle Tissue Atrophy: decreased coordination, loss of muscle strength, gait changes, risk for falls w/injury
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Assessment:
Patient History
- Any traumatic injuries & sports activities, no matter when they occurred
- Previous or current illness or disease (ex. diabetes slows healing process)
- Previos hospitalizations & illnesses or complications
- Current lifestyle (weight-bearing or high-impact activities, tobacco or alcohol use)
- Occupation or work life (predisposed to certain injuries)
- Allergies (dairy = decr. Ca intake)
- Previous/Current drug use (prescription, OTC, illicit)
- Herbs, Vit&Min Supplements, Biologic Compounds (glucosamine, chondroitin)
- Complementary & Alternative TherapiesTypical day of Food Intake (identify deficiencies & excesses in nutrients)
- Family Hx (identify disorders w/familial or genetic tendency)
- Current Health Problems (most commonly pain & weakness)
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