axial skeleton Flashcards
how many divisions are in the skeletal system
2
name the divisions of the skeletal system
axial and appendicular
what makes up the axial division
80 bones around the body axis
name the 4 main parts of the axial skeleton
the skull
hyoid
thorax
vertebral column
how many bones make up the skull and hyoid and what are their names
8
frontal, 2 parietal, 2 temporal, occipital, sphenoid and ethmoid
what is the function of the cranial bones
to protect the brain
how many facial bones are there
14
name the facial bones
2 nasal, 2 maxillae, 2 zygomatic, mandible, 2 lacrimal, 2 palatine, 2 inferior nasal conchae and comer
when does facial bone growth stop
age 16
what is the unique feature of the skull
has immoveable joints between skull bones
and
paranasal sinuses-cavities
what do paranasal sinuses-cavities do
are mucous membranes
resonating chambers
what does the vertebral column do
encloses spinal cord
supports head
point of attachment for muscles of back, ribs and pelvic girdle
what makes up the vertebral column
7 cervical vertebrae
12 thoracic
5 lumbar
1 sacral (5 bones fused together)
1 coccyx (3 or 4 bones fused together)
how many bones are in the vertebral column of an embryo
33
how many bones are in the vertebral column of an adult
26
how many curves does the vertebral column contain
4 normal curves
what are the curves in the vertebral column called
cervical, lumbar, thoracic and sacral
which vertebral column curves are convex
cervical and lumbar
which vertebral column are concave
thoratic and sacral
what is the function of curves in the vertebral column
increase strength, help in balance and absorb shocks
