Skeletal System A&P 1
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49 Terms
206 bones
How many bones are in the adult human skeleton?
Axial skeleton and appendicular skeleton
What are the two major divisions of the skeleton?
80 bones
How many bones are in the axial skeleton?
126 bones
How many bones are in the appendicular skeleton?
Skull, auditory ossicles, hyoid bone, vertebral column, and thoracic cage
What structures make up the axial skeleton?
Pectoral girdles, upper limbs, pelvic girdle, and lower limbs
What structures make up the appendicular skeleton?
Central axis of the body; protects organs of the head, neck, and trunk
What is the main function of the axial skeleton?
Includes the limbs and the girdles that attach the limbs to the axial skeleton
What is the main function of the appendicular skeleton?
22 bones
How many bones are in the skull?
8 bones
How many cranial bones are there?
14 bones
How many facial bones are there?
Frontal, 2 parietal, 2 temporal, occipital, sphenoid, and ethmoid
What are the cranial bones?
1
How many frontal bones are there?
2
How many parietal bones are there?
2
How many temporal bones are there?
1
How many occipital bones are there?
1
How many sphenoid bones are there?
1
How many ethmoid bones are there?
1 mandible, 2 maxillae, 2 zygomatic, 2 nasal, 2 lacrimal, 2 palatine, 2 inferior nasal conchae, and 1 vomer
What are the facial bones?
1
How many mandible bones are there?
2
How many maxillae are there?
2
How many zygomatic bones are there?
2
How many nasal bones are there?
2
How many lacrimal bones are there?
2
How many palatine bones are there?
2
How many inferior nasal conchae are there?
1
How many vomer bones are there?
6 bones
How many auditory ossicles are there?
Malleus, incus, and stapes
What are the three auditory ossicles?
2, one in each ear
How many malleus bones are there?
2, one in each ear
How many incus bones are there?
2, one in each ear
How many stapes bones are there?
1
How many hyoid bones are there?
In the neck, between the mandible and larynx
Where is the hyoid bone located?
26 bones
How many bones are in the adult vertebral column?
7
How many cervical vertebrae are there?
12
How many thoracic vertebrae are there?
5
How many lumbar vertebrae are there?
1 fused bone
How many sacrum bones are counted in the adult skeleton?
1 fused bone
How many coccyx bones are counted in the adult skeleton?
Cervical, thoracic, lumbar, sacrum, and coccyx
What is the order of the vertebral regions from superior to inferior?
25 bones
How many bones are in the thoracic cage?
Sternum and 12 pairs of ribs
What bones make up the thoracic cage?
1
How many sternum bones are there?
24 ribs
How many ribs are there?
12 pairs
How many pairs of ribs are there?
22 skull + 6 auditory ossicles + 1 hyoid + 26 vertebral column + 25 thoracic cage = 80
How do you calculate the total number of axial skeleton bones?
80 axial bones + 126 appendicular bones = 206 bones
How do you calculate the total number of bones in the adult skeleton?
The sacral and coccygeal vertebrae fuse during development, so they are counted as 2 bones in the adult skeleton
Why are there 26 adult vertebral column bones if there are 33 vertebrae during development?