Floor cranium bones

frontal bone

N

• the bone of the calvarium that is most readily visible

• This bone contributes to the formation of the forehead and the superior part of each orbit

ethmoid bone

M

• lies primarily below the floor of the

  cranium

• articulates with two cranial bones:

  frontal and sphenoid

sphenoid bone

O

•  forms the anchor for all eight cranial bones

temporal bone

P

• left and right that house the delicate organs of hearing and balance.

parietal bone

Q

• The lateral walls of the cranium and part of the roof 

• are roughly square and have a concave internal surface.

occipital bone

R

• The inferoposterior portion of the calvarium (skullcap)