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Skeletal System Functions
- Support
2.Protect
3.Movement
4.Storage - Blood cell production
Always contains collagen,gorund substance,and other organic molecules as well as water and minerals
THE MATRIX
Cartilage, tendons and ligaments of the skeletal system are
ALL CONNECTIVE TISSUES
tough ropelike protein
collagen
are large molecules consisting of many polysaccharides attaching to and encircling core proteins
PROTEOGLYCANS
form large aggregates and attract water
Proteoglycans
The extracellular matrix of cartilage contains
collagen and proteoglycans
It makes the cartilage tough
Collagen
It makes the cartilage smooth and resilient
water-filled proteoglycans
It is rigid but it springs back to its original shape after being bent or slightly compressed
Cartilage
It is an excellent shock absorber
Cartilage
lend flexible strength to the bone
Ropelike collagen
The extracellular matrix of it contains collagen and minerals, including calcium and phosphate
BONE
It gives bone compression(weight bearing) strength
THE MINERAL COMPONENT
Mostly in a form of calcium phosphate crystals called hydroxyapatite
Mineral in bone
Calcium phosphate crystals are also called
hydroxyapatie
4 bone shape classification
long
short
flat
irregular
are longer than they are wide ; examples are upper and lower limb bones
LONG BONES
are approximately as wide as they are long ; examples are the bones of the wrist and ankle.
SHORT BONES
have a relatively thin, flattened shape ; examples are bones of the skull and sternum
FLAT BONES
include the vertebrae and facial bones, which have shapes that do not fit readily into the other three categories
IRREGULAR BONES
contains cavities such as the large medullary cavity in the diaphysis as well as smaller cavities in the epiphyses of long bones and in the interior of other bones
BONES
These spaces are filled with soft tissues called
MARROW
the location of blood forming cells
Red Marrow
It is mostly fat
Yellow marrow
In newborns most bones have blood making __________
Red bone marrow
In adults red marrow in the diaphysis is replaced by _________
Yellow bone marrow
In adults, it is mostly in the flat bones and the long bones of the femur and humerus
Red bone marrow
It is located at the epiphyses of long bones and center of other bones
Spongy Bone
It has trabeculae which are interconnecting rods and spaces that contain marrow
Spongy bone
Spongy bone has no _______
Osteons.
responsible for the formation of bone and the repair and remodeling of the bone
Osteoblasts
cells that maintain bone matrix and form from osteoblasts after bone matrix has surrounded it
Osteocytes
contribute to bone repair and remodeling by removing existing bone called bone reabsorption
Osteoclasts
is the formation of bone by osteoblasts
Ossification
Bone formation that occurs withing connective tissues membranes are called
Endochondral ossification
Both types of bone formation result in ββββ-
compact and spongy bone
occurs when osteoblasts begin to produce bone within connective tissues
Intramembranous ossification
It occurs primarily in the bones of the skull
Intramembranous ossification
Osteoblasts line up on the surface of connective tissue fibers and begin depositing bone matrix to form trabeculate
Intramembranous ossification
constantly remodeled and they may enlarge or be replaced by compact bone
Trabeculae
is bone formation within a cartilage model
Endochondral bone formation
The cartilage model is replaced by
bone
which is bone formation in the diaphysis of a long bone
Primary ossification center
bone formation in the epiphysis
Secondary ossification center
forms which is a fibrous network between 2 fragment
Callus
It causes bleeding and a blood clot forms
Broken Bone
Cartilage model forms first then, osteoblasts
enter the callus and form cancellous bone
this continues for
4-6 weeks after injury
slowly remodeled to form compact and cancellous bone
cancellous bone
Anatomical term
Foramen
example foramen magnum
Hole
Anatomical Term
Fossa
example glenoid fossa
Depression
Anatomical term
Process
example mastoid process
Projection
Anatomical Term
Condyle
example occipital condyle
Smooth , rounded end
Anatomical Term
Meatus
example external auditory meatus
canal like passageway
Anatomical Term
Tubercle
example greater tubercle
lump of bone
It is composed of the skulls , the vertebral column and the thoracic cage
Axial Skeleton
Has 22 bones divided into those of the braincase and those of the face
Skull
encloses the cranial cavity consists of 8 bones that immediately surround and protect the brain
braincase
has 14 facial bones
Bony Structure
rather solidly connected to form the bulk of the face
Thirteen of the facial bones
forms a freely movable joint with the rest of the skull
Mandible
Anterior part of cranium
Frontal Bone
sides and roof of cranium
Parietal bones
posterior portion and floor of cranium
Occipital bones
inferior to parietal bones on each side of the cranium
temporomandibular joint
Temporal Bones
forms part of cranium floor , lateral posterior portions of eye orbit, lateral portions of cranium anterior to temporal bones
Sella turcica
Sphenoid bone
anterior portion of cranium, including medial surface of eye orbit and roof of nasal cavity
nasal conchae
Ethmoid bone
form upper jaw anterior portion of hard palate, part of lateral walls of nasal cavity, floors of eye orbits
Maxillae
form posterior portion of hard palate, lateral wall of nasal cavity
Palatine Bones
cheek bones
also form floor and lateral wall of each eye orbot
Zygomatic bones
Medial surfaces of eye orbits
Lacrimal Bones
form bridge of nose
Nasal Bones
In midline of nasal cavity
forms nasal septum with the ethmoid bone
Vomer
attached to lateral walls of nasal cavity
Inferior Nasal conchae
Lower jawbone
only movable skull bone
mandible
is an unpaired, U-shaped bone
that is not part of the skull and has no direct bony
attachment to the skull or any other bones.
Hyoid Bone
has the unique distinction of
being the only bone in the body that does not
articulate with another bone.
hyoid bone
provides an attachment for some
tongue muscles, and it is an attachment point for
important neck muscles that elevate the larynx.
hyoid bone
is the central axis of the
skeleton, extending from the base of the skull to slightly
past the end of the pelvis.
Vertebral column or spine
in adults it usually consists of 26 individual bones grouped into five regions
spine
The adult vertebral column has four major curvatures:
cervical, thoracic, lumbar and sacrococcygeal.
regions curves anteriorly
cervical region
region curves posteriorly
thoracic region
region that curves anteriorly
lumbar region
regions together curve posteriorly
Sacral and coccygeal
- 1st vertebra
- holds head
Atlas
2nd vertebra
* rotates head
Axis
how many cervical vertebra
7
how many thoracic vertebra
12
how many lumbar vertebra
5w
how many sacrum
1
how many coccyx
1
functions of vertebral column
Supports body weight
Protects the spinal cord
Allows spinal nerves to exit the spinal cord
Provides a site for muscle attachment
Provides movement of the head and trunk
Sternum
breastbone
It protects vital organs
12 pair of ribs
attach directly to sternum by cartilage
True ribs
attach indirectly to sternum by cartilage
false ribs
not attached to sternum
floating ribs
2 bones of the pectoral girdle
scapula and clavicle
scapula is ββ
shoulder blade
clavicle isβ
collar bone
what are the upper limb bones
humerus- upper limb
ulna- forearm
radius- forearm
carpals - wrist
metacarpals - hand
where lower limbs attach to the body
Pelvic Girdle
include pelvic girdle and coccyx
pelvis
inferior and posterior region
Ischium
most superior region
ilium
hip socket (joint)
acetabulum
Lower limb bones
femur- thigh
patella- knee cap
tibia- large lower leg
fibula - small lower leg
tarsals - ankle
metatarsals- foot
phalanges - toes and fingers
are where two bones come together
articulations (joints)
can be classified structurally as fibrous,
cartilaginous, or synovial, according to the major
connective tissue type that binds the bones
together and whether a fluid-filled joint capsule is
present.
joints
Joints are also be classified in functional categories
according to their degree of motion as ____
synarthroses, amphiarthroses, or diarthroses.
Structural Classification of Joints
it is united by fibrous connective tissues
FIBROUS JOINT
Structural Classification of joint
united by means of cartilage
cartilaginous
Structural classification of joints
joined by a fluid cavity
most joints of the appendicular skeleton
synovial
what are the subclasses of fibrous joint
sutures
syndesmosis
gomphoses
what are the subclasses of cartilaginous
synchondroses and symphysis
3 FUNCTIONAL CLASSIFICATION OF JOINTS
synarthrosis
amphiarthrosis
diarthrosis
- non-movable joint
- Example β skull bone articulations* non-movable joint
SYNARTHROSIS
- slightly movable joint
- Example - between vertebrae
AMPHIARTHROSIS
- freely movable joint
- Example - knee, elbow, and wrist articulations
DIARTHROSIS
TYPES OF MOVEMENT
bending
flexion
TYPES OF MOVEMENT
straightening
extension
TYPES OF MOVEMENT
movement away from midline
abduction
TYPES OF MOVEMENT
movement toward the midline
adduction
TYPES OF MOVEMENT
rotation of the forearm with palms down
pronation
TYPES OF MOVEMENT
rotation of the forearm with palms up
supination
TYPES OF MOVEMENT
movement of a structure about the long axis
rotation
3 EFFECTS OF AGING ON THE SKELETAAL SYSTEM AND JOINTS
- Decreased Collagen Production
- Loss of Bone Density
- Degenerative Changes