the skeletal system part 2
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the skull is composed of what two bones?
cranial and facial bones
sphear like structure that surrounds and protects the brain
the cranium is made up of ___ bones
- 8 total
- 1 frontal
- 2 pariental
- 2 temporal
- 1 occipital
- 1 ethmoid
- 1 sphenoid
the facial bones are made of of how many bones?
- 14 total
- 1 mandible (lower jaw)
- 2 maxilla (upper jaw)
- 2 zygomatic (cheek)
- 2 lacrimal (inner aspect of the eyes)
- 5 nasal
- 2 palatine
at birth, the cranium is _______
not solid bone
spaces that allow for the enlargement of the skull as brain growth occurs
frontanels are made of membrae and cartillage and turn into solid bone by ___
approx. 18 months of age
areas there the cranial bones have joined together
air spaces in the bones of the skull that act as resonating chambers for the voice
openings in the bones that allow nerves and blood vessels to enter or leave the bone
how many vertebrae make up the spinal column?
what does the spinal column do?
protect the spinal cord and provide support fot the head and trunk
name the type of vertebrae that make up the spinal column
- 7 cervical (neck)
- 12 thoracic (chest)
- 5 lumbar (waist)
- 1 sacrum (back of pelvic girdle)
- 1 coccyx (tailbone)
pads of cartilage that separate the vertebrae, acts as a shock absorbers, permit bending and twisting movements of the vertebral column
how many ribs are there?
there are 12 pair of ribs
ribs are attached to the _____________
thoracic vertebrae on the dorsal surface of the body
the first seven pair of ribs are called ________
true ribs because they attac directly to the sternum (breastbone)
the last five pair of ribs are called ________
the first three are attached to _______
and the last two pairs are called _________
- false ribs
- cartilage of the rib above
- floating ribs because they have attachment to the front of the body
the sternum is made up of how many bones and what are they from top to bottom?
- 3 parts:
- manubrium (upper region)
- gatdius (body)
- xiphoid process (a small piece of cartilage at the bottom)
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