Divisions of the Skeletal System
axial skeletal system, appendicular skeletal system
How many bones make up the axial skeleton?
80 bones
What does the axial skeleton include?
does not include arm or leg bones, or any bones used to attach the arms and legs
Skull
22 bones: 8 cranial bones, 14 facial bones
Bones associated with the skull
7 bones: 6 auditory ossicles (three in each ear), hyoid bone (tongue muscle attachments)
Vertebral column
26 bones: 24 vertebrae, sacrum, coccyx
Thoracic Cage
25 bones: 24 ribs, sternum
Lambdoid suture
Separates occipital from parietal bones
Coronal Suture
Attaches frontal bone to parietal bones
Sagittal Suture
Between the two parietal bones on top of skull
Squamous Sutures
between temporal bones and parietal bones
Fontanels
fibrous connective tissue (soft spots), allow skull to flex during birth
Infant Skull
Grows rapidly, large compared to the body
Cranial Bones
Occipital bone, Frontal bone, Sphenoid, Ethmoid, Parietal bones, Temporal bones
Facial Bones
Inferior nasal conchae (2), Lacrimal bones (2), Mandible, Maxilla (2), Nasal bones (2), Palatine bones (2), Vomer, Zygomatic bones (2)
Ossicles of the Inner Ear
three bones transmit vibrations from the eardrum to the cochlea, smallest bones in the body
Number of facial bones
14
Number of cranial bones
8
Studied by 33 People
