U2- Practical 2 Flashcards
diaphysis
shaft of long bone
epiphysis
ends of long bone, increases SA for attachment
houses spongy bone
articular cartilage
surrounds ends of bones
hyaline cartilage
allows for lubrication of joints
epiphyseal plate/ line
growth plate
spot of metaphysis
medullary cavity
cavity houses bone marrow
spot for hematopoiesis
compact bone
outer shell of bones
spongy bone
permeated bone filled w/ bone marrow
found on inside of bones
trabeculae
lattice structure that composes spongy bone
osteon
basic unit of bone
central canal + lamellae
osteocyte
former osteoblast trapped in matrix deposited
central canal
center of concentric lamellae
where vasculature enters the bone
perforating canals
connect central canals w/ diagonal passages
concentric lamellae
layers of matrix circled around central canal
circumferential lamellae
lines boundaries of dense bone
hold broken down osteons
lacuna
house osteocytes
connected by canaliculi
canaliculi
channels connect conc. lamellae + lacunae
bone endosteum
reticular CT
lines internal marrow cavity, canal system and all spongy bone
bone periosteum
external sheath covering bones
perforating fibers (Sharpey’s)
connect Spongy bone (lamellae) to periosteum (outside sheath)
muscle fiber
single musc. cell
contains proteins filaments, multiple nuculi and smooth Er
endomysium
surr. e/ musc. fiber
epimysium
elastic sheath surr. whole muscle
muscle fascicle
bundle of musc. fiber
surr. by perimysium
perimysium
sheath surr. entire muscle fiber. makes Fascicle
tendon
fibrous collagenous tissue attaches bone to muscle
aponeurosis
envelope, bind or connect musc.
neuromuscular junction
never fiber meets target cell + target cell is a musc. cell
mvmnt- fibrous structure
synarthrosis. No mvmnt (fused) ex. skull
mvmnt- cartilaginous
amphiarthrosis. partcial mvmnt ex. spine
mvmnt- synovial
diathrosis. freely movable Ex. shoulder, elbow, ankle…
types of synovial joints (6)
ball and socket gliding hinge saddle pivot ellipsoidal
articular capsule
encloses joint cav.
retains syn. fluid
covered by fibrous capsule
synovial mem.
inside fibrous capsule
contains cells that secrete syn. fluid
articular cartilage
hyaline cart.
covers ends of bones
joint cavity
divides cartilage and bone
contains syn fluid
burase
fibrous sac of syn fluid
btw muscles, where tendon passes over bone or btw bone and skin
ligaments
attaches bone to bone
Gliding joint
two sheets griding over e/ o/
ex. btw carpal bones
non-axial
hinge joint
like door
ex. elbow and knee
mono-axial
pivot joint
one part rotating around another
ex. axial vertebrate (first 2 verteb)
mono-axial
ellipsoidal joint
vertical twisting (like grounding powder in chem) ex. joint btw carpal and metacarpal biaxial
saddle joint
u shaped depression w/ lateral mvmnt
ex. sternum- clavical joint
biaxial
ball and socket joint
has circumdifcial mvmnt
ex. hips and shoulder
triaxial
flexion
reducing angle
ex. moving forearm towards body at 90 degree angle
extension
creating larger angle
ex. straightening forearm away body at 90 degree angle
abduction
away from the body
ex. legs swings laterally
adduction
towards the body
ex. arms move towards midline
rotation
bone spins on longitudinal axis
ex. turning ankle left and right
lateral flexion
Ex. left and right at waist
protraction
anterior mvmnt in horizontal plane
ex. pushing chin out
retraction
posterior mvmnt in horiz. plane
ex. pushing chin into neck (double chin)
circumduction
one end of appendage is stationary, while other rotates
ex. shoulder exercises
L rotation
head and chest turn right
R rotation
head and chest turn left
dorsiflexion
lift toes up
plantarflexion
toes down
endochondral oss. vs intramembranous ossification
endo- cartilage precursor
intra- comes from mesenchyme
endochondral ossification
1- enlarging of chondrocytes for calcification 2- perichondrium formed blood + nerves surr. bone 3- blood vessels penetrate ossificaiton beings 4- medullary cavity is present osteoclasts remove spongy bone 5- secondary ossif. occurs 6- epiphysis's develop 7- bone matures articular cartilage dev.
intramembraneous ossification
1- osteoid tissue turns into mesenchyme 2- calcification of osteoid tissue osteoblast entrapment 3- honeycomb of spongy bone dev. w/ periosteum 4- compact bone surr. spongy bone
sutures of the skull
coronal sagittal squamous lambdoidal occipitomastoid
coronal
btw frontal and parietal
sagittal
btw parietal and midline
squamous
squamous portion of temporal bone + parietal bone
lambdoidal
btw parietal + occipital
occipitomastoid
btw occipital bone and mastoid portion of temporal bone
fetal skull features
all fontanels
anterior fontanel
largest fontanel
sphenoidal fontanel
in btw sphenoid, frontal and parietal
posterior fontanel
btw occipital and parietal