SKELETAL SYSTEM Flashcards
is composed of several types of bones based on
their appearance, location, and functions
skeletal system
Functions of Bones
- support
- for storage of minerals
- blood cell production
- protection
of internal tissues/ organs - leverage
About ___ of bones are an
organic framework of fibrous tissues and cells
1/3
About ___ of bones are
inorganic component
2/3
1/3 of bones includes _____ and _____ that is called ______
collagen - polysaccharides - glycosaminoglycans
Glycosaminoglycans contains _____
chondroitin sulfate
Glycosaminoglycans gives bones _____ and _____
resilience - toughness
2/3 of bones includes _____ and _____ that give bone _____ and _____
largely of calcium - phosphorus salts - hardness - rigidity
are dense or cortical, with a hard-exterior layer
and forms almost the entire shaft of long bones
compact bones
are
spongy bones composed spicules arranged to form a porous (reticular)
network with spaces usually filled with marrow
cancellous bones
is the space surrounded by the cortex of a long bone
medullary cavity or marrow cavity
In young animals, this cavity is filled with _____, mainly composed of ______, and is gradually replaced by ______ as the animal ages
red marrow - hematopoietic tissues - yellow marrow
referring to
either end of a long bone (extremity)
epiphysis
the cylindrical shaft of a long bone
between the two epiphyses
diaphysis
- referring to the flared (erupting)
area adjacent to the epiphysis of a mature bone - area where the cortical bone become thinner
metaphysis
- a layer of hyaline cartilage within the metaphysis that separates the
diaphysis from epiphysis of an immature bone - area in which a bone can increase in length
epiphyseal cartilage or
disk
is a thin
layer of hyaline cartilage that covers that articular (joint) surface of a bone
Articular cartilage
is a fibrous membrane that covers the surface of a bone
except where the articular cartilage is located
periosteum
is the
fibrous membrane that lines the marrow cavity
endosteum
are the bone-producing cells
osteoblasts
are the bone-destroying
cells
osteoclasts
- are greater in one dimension than any other
- function
chiefly as levers and aid in support, locomotion, and prehension
Long bones
examples of long bone
- femur
- tibia
- fibula
- metatarsals
- humerus
- ulna
- radius
- metacarpals
- phalanges
- are cuboid, or approximately equal in all
dimensions; interior is composed of spongy bone filled with marrow spaces - absorb concussion, and they are found in complex joints, such as carpals and
tarsals
Short bones
examples of short bone
- carpals
- tarsals
- are relatively thin and expanded in two dimensions
- chiefly
for the protection of vital organs
Flat bones
spongy material that separates lamina externa from interna
diploe
examples of flat bone
- sternum
- ribs
- scapula
- cranial bones
- are so called because of their fancied
resemblance to a sesame seed - reduce friction, increase leverage, or change
the direction of pull, such as the patella.
Sesamoid bones
examples of sesamoid bone
- patellae
contain air
spaces or sinuses that communicate with the atmosphere
Pneumatic bones
- are unpaired bones on the median plane
- protection,
support, and muscular attachment such as the vertebrae and fascial bones
Irregular bones
examples of irregular bone
- vertebrae
- facial bones
located along the axis of the body
and composed of the bones of the head and trunk of the vertebrae
axial skeleton
are bones associated with the appendages of the
body, such as the bones of the limb, including the bones that unite them
appendicular skeleton
are any bony formation in an organ such as in the heart,
tongue and penis or certain animals
visceral skeleton
axial - cranium part
form the caudal and dorsal walls
The occipital, parietal, interparietal, and frontal bones
axial - cranium part
form the lateral and
ventral walls
the temporal and sphenoid bones
axial - cranium part
forms the rostral wall
ethmoid bone
has the cornual process or the bony projections, except polled animals,
covered by the horn
frontal bone
contain the middle and inner ears
temporal bones
supports the brain and pituitary gland
sphenoid bone
presents the numerous openings for passage of the olfactory nerves for the
sense of smell
ethmoid bone
- or the bony socket that
protects the eye - is surrounded by the frontal, lacrimal and zygomatic bones
orbital region
- is bordered dorsally by the nasal bones
- laterally by the
maxillae and incisive bones - ventrally by the palatine processes of the
maxillae, incisive, and palatine bones.
nasal region
separates the nasal
passages
vomer bone
which is scroll-like that projects into
the nasal passages
conchae or turbinate bone
is roofed by the maxillae and incisive
bones, and palatine bone, and ventrolateral walls by the mandible
oral region
contain the teeth of the upper dental
arcade (incisive bones of ruminant lack teeth)
maxillae and incisive bones
contains
all the lower teeth and provides attachments for muscles for chewing and
swallowing
mandible
have well-developed articular processes to
accommodate the large range of motions of the neck
Cervical vertebrae
The first cervical
vertebra
atlas
the second cervical vertebra
axis
are characterized by well-developed spinous processes
and articular facets for the ribs.
thoracic vertebrae
have large, flat
transverse processes that project laterad
lumbar vertebrae
are fused to
form a single wedge-shaped bone, the sacrum
sacral vertebrae
single wedge-shaped bone
sacrum
form
the bony basis for the tail.
caudal vertebrae
forms the ventrum of the bony thorax
and gives attachment to the costal cartilages of the ribs as well as providing
a bony origin for the pectoral muscles
sternum
cranial extremity of the sternum
manubrium
middle portion of the sternum
body
the caudal extremity
xiphoid process
form the lateral walls of the bony thorax
ribs
is relatively flat triangular
bone
scapula or shoulder blade
is present in birds and primates
clavicle or collarbone
forms the arm bone
humerus
in mammals, radius is ____ than the ulna
larger
in birds, radius is ____ than the ulna
smaller
in equine and bovine, radius and ulna are ____
fused
in dogs and cats, radius and ulna are ____
separate
is composed of two rows of small
bones.
carpus
is located distal to the carpus
metacarpus
in horse, metacarpus is a ______
single large bone
in ox and sheep, metacarpus is composed of _______ and also called _______
fused 3rd and 4th metacarpal bones - cannon bone
in pigs, it is composed of ___ bones
4
digits are numbered from _____
1-5, depending on the species
the proximal
phalanx in horses
long pastern bone
the middle phalanx in horses
short pastern bone
the distal phalanx in horses
coffin bone
consists of a circle of bones comprises three bones which are fused to form the
os coxae, or pelvic bone
pelvis
is the largest
and most dorsal part of the pelvic cavity
ilium
forms majority of the floor of the pelvic cavity
ischium
is the smallest of the three and forms the cranial part of the floor of the
pelvic cavity
pubis
extends from the coxofemoral (hip) joint to the stifle (human knee) joint
femur or thigh bone
are the bones of the true leg (crus)
tibia and fibula
is composed of the multiple small bones that corresponds to the human
ankle
tarsus or
hock
rostral bone in
swine, the soft tissue of
the external nares
Os rostri
cardiac skeleton in bovine; around the origin of the aorta and pulmonary artery at the base of the heart.
Os cordis
- penile bone (baculum or os priapi) in the
canine family, also in gorilla and chimpanzee - located
above the male urethra, and it aids sexual reproduction
by maintaining sufficient stiffness during sexual
penetration.
Os penis