4b - Skeletal System; Axial Skeleton Flashcards
Axial skeleton components (4)
skull bones
vertebral column
ribs
sternum
skull functions (4)
- house and protection for brain and sense
organs - house attachment for digestive system
-provide cavity for air to enter body
-communication
3 areas of skull
cranium
nasal chambers and maxilla
mandible
maxilla is
upper jaw
mandible is
lower jaw
cranium is
bony case protecting brain
cranium bones (8)
parietal
temporal
frontal
occipital
sphenoid
saggital crest
zygomatic arch
lacrimal
parietal location (cranium)
dorsal, lateral
temporal location (cranium)
below parietal bone
tympanic bulla (ear)
frontal location (cranium)
front of cranium (forehead)
occipital location (cranium)
back of skull (caudal)
sphenoid location (cranium)
ventral
saggital crest location (cranium)
dorsal midline
zygomatic arch location (cranium)
cheekbone
lacrimal location (cranium)
eye - tears
nasal chambers location
rostral part of skull
nasal chambers is divided…
in 2 (left and right)
what divides the nasal chambers
nasal septum (vomer)
each nasal chamber is filled with
turbinates
paranasal sinuses are
air filled cavities in bone
number of paranasal sinuses in dogs
2
paranasal sinuses location
frontal sinus in frontal bone (one either side)
maxillary in maxilla
when paranasal sinuses inflamed can cause
pain in head and teeth due to location of sinuses
hyoid apparatus structure and location
trapeze structure
hangs from skull
tongue attached one side, larynx attached the other
skull shapes (3)
brachycephalic (small; pug)
mesophalic (average; labrador)
dolichocephalic (narrow shape nose; greyhound)
vertebral column is
vertebrae arranged in series from base of skull to tip of tail
vertebral column function
protect and house spinal cord
vertebrae base structure components (6 -see image drawn for visual representation )
neural arch
spinous process
spinal cord
articular process
body
transverse process
vertebrae - transverse process location
side
vertebrae - cranial articular process location
towards head, join vertebrae in front
vertebrae - caudal articular process location
towards tail, join vertebrae behind
vertebrae - spinous process location
top
vertebrae regions (5)
cervical
thoracic
lumbar
sacral
caudal
cunts, twats, lumbago, shithead, cd
vertebral column formula
C7, T13, L7, S3, Cd 20-23
cervical vertebrae number
7
c1 is the…
atlas
c2 is the…
axis
c1 structure
no body or spinous process
2 large lateral wings (transverse processes)
c1 joined with
skull
c2 structure
blade-like spinal process
c2 is a point of…
attachment for neck muscles
the ______ rotates on the ______ allowing for ______
atlas
axis
head rotation
thoracic vertebrae number
13
thoracic vertebrae forms joints with
13 pairs of ribs on either side of the vertebrae body
thoracic structure
short body and tall spinous processes
short transverse processes
lumbar vertebrae number
7
lumbar structure
longer bodies than thoracic
larger transverse processes
lumbar large transverse process for
strong muscle attachment in abdomen
which vertebrae region does the spinal cord end
lumbar
sacral vertebrae number
3
sacral vertebrae formation
fused together
sacral forms joint with
pelvis (attached to wings)
caudal vertebrae number
20-23
caudal structure
first few same as lumbar
then vary in shape progressively smaller until small bone at end of tail
dog vs cat spine
dog spine = straight and solid
cat spine = diagphragmatic hump (flexible)
ribs number
13 pairs
ribs bone type
flat
ribs formation
dorsal bony and ventral cartilage
costal cartilage is
the cartilage on the end of bony rib
ribs dorsally articulate with
thoracic vertebrae
ribs ventrally - sternal ribs number
1-8
ribs ventrally - asternal ribs number
9-12
ribs ventrally - floating ribs number
13
sternal ribs articulate with
sternum
asternal ribs touch….
cartilage of rib in front forming the costal arch
floating ribs….
cartilaginous ends lie free in muscle wall
costal arch can be seen
ventrally
sternum is
short cylindrical bone that forms floor of rib cage
sternabrae number
8
1st sternabrae called
manubrium
8th sternebrae called
xiphoid process
xiphoid process structure
long and flat
position of sternum in relation to ribs
lie below the ribs and joins to the first 8 pairs