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The skeletal system

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The skeletal system Structure and function of bone Organization of the skeleton Joints Elevation and depression- raising body part up or down Aging and bones both ... – PowerPoint PPT presentation

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Title: The skeletal system


1
The skeletal system Structure and function of
bone Organization of the skeleton Joints
2
Functions of bone (skeleton) Support and
protection Blood cell formation Mineral storage
(calcium especially) Site for muscle
attachment?body movement Protect blood vessels,
nerves
3
Bones classified by shape long, short, flat,
irregular, round Long bones- in limbs Short
bones- wrists and ankles Flat bones- ribs,
scapulae, cranium Irregular- vertebrae, facial
bones Sesamoid (round)- patella
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Compact bone osteocytes within lacunae arranged
in concentric circles called lamellae This
surrounds a central canal complex is
called osteon (Haversian system) Canaliculi
connect osteocytes to central canal and to each
other
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Prenatal development skeleton is mostly
cartilaginous Cartilage cells and then
osteoblasts start to deposit minerals Cartilagin
ous disk (epiphyseal disk) remains in
epiphysis Cells eventually stop dividing
8
Fetal bone development
  • Intramembranous-sheets of connective tissue
  • Endochondrial- from masses of hyaline cartilage

9
Fetal child adult
10
Adults continually break down (resorb) and build
up (deposit) bone Osteoclasts remove damaged
cells and release calcium into
blood osteoclasts come from bone
marrow Osteoblasts remove calcium from blood and
build new matrix. They become trapped? osteocyte
s osteoblasts originate in connective tissue
11
Bone fractures- and how they heal
12
Axial skeleton skull (cranium and facial
bones) hyoid bone (anchors tongue and
muscles associated with swallowing) vertebral
column (vertebrae and disks) thoracic cage
(ribs and sternum) Appendicular
skeleton pectoral girdle (clavicles and
scapulae) upper limbs (arms) pelvic girdle
(coxal bones, sacrum, coccyx) lower limbs (legs)
13
posterior view p. 135
14
Bones named and numbered in Table 7.1 Terms
listed in table 7.2 Axial skeleton supports and
protects organs of head, neck and
trunk Appendicular skeleton- bones of limbs and
bones that anchor them to the
axial skeleton Articulation- where joints are
formed
15
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
16
The skull 8 sutured bones in cranium Facial
bones 13 sutured bones, 1 mandible Cranium enca
ses brain attachments for muscles sinuses
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Allows for growth
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Vertebral column 7 cervial vertebrae 12
thoracic 5 lumbar 1 sacrum (5 fused 1 coccyx (4
fused) Vertebrae vary in size and morphology
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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 rib Two pairs of
floating ribs
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Clavicles and scapulae Help brace
shoulders Attachment sites for muscles
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Bones of upper limb Humerus (upper arm) Radius
ulna Carpals, metacarpals, phalanges Bones of
lower limb Femur Patella Tibia, fibula Tarsals,
metatarslas, phalanges
26
Joints Immovable (synarthoses) bones sutured
together by connective tissue skull Slightly
movable (amphiarthoses) connected
by fibrocartilage or hyaline cartilage vertebra
e, rib/sternum joint, pubic symphysis Freely
movable (diarthroses)- separated ligaments- hold
bones together tendons- muscle to bone lined by
synovial membrane
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Different types of synovial joints
Condylar Hinge Saddle
Ball-and-socket Plane Pivot
30
Types of movement and examples (with
muscles) flexion- move lower leg toward
upper extension- straightening the
leg abduction- moving leg away from
body adduction- movong leg toward the
body rotation- around its axis supination-
rotation of arm to palm-up position pronation-
palm down circumduction- swinging arms in
circles inversion- turning foot so sole is
inward eversion- sole is out
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Elevation and depression- raising body part
up or down Aging and bones both bone and
cartilage tend to deteriorate cartilage
chondrocytes die, cartilage becomes
calcified osteoporosis bone is broken down
faster than it can be built bones get weak and
brittle tend to fracture easily
35
Risk factors for osteoporosis Inadequate
calcium Little weight-bearing exercise Drinking
alcohol, smoking Being female decreased estrogen
secretion after menopause Small frame Caucasian
or Asian ethnicity
36
Skeleton and other systems Skin makes vitamin D
which enhances calcium absorption Skeleton
stores calcium for muscle contraction, nervous
stimulation, blood clot formation Red marrow-
site of blood cell formation Calcium levels
regulated by parathyroid hormone and
calcitonin kidneys (can help provide vitamin
D) digestive system (can release calcium into
blood
37
Regulation of blood calcium levels
38
Growth hormone regulates skeletal
growth stimulates cell division in epiphyseal
disks in long bones Growth stops when
epiphyseal disks are converted to bone When
excess growth hormone is produced
in childhood?gigantism In adulthood-
acromegaly. Bones cant grow but soft tissue can
39
This man suffered from a pituitary tumor
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When muscle contracts, it shortens and
causes movement Skeletal muscles attached to
bones by tendons Insertion- attachment to more
movable bone Origin- less movable Flexors and
extensors act on the same joint to produce
opposite actions You need both bones and muscles
for movement!
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