11, 12, 13
Diplöe - spongy inner portion analogous to the trabecula in long bones
Superior sagittal sulcus
the groove for the superior sagittal sinus is a depression formed on the internal surface of the frontal, parietal, and occipital bones in the midline.
It courses from the frontoethmoid junction to the internal occipital protuberance.
- know: frontal sinus, frontal orbits, supraorbital margin
the union of the superior sagittal sinus sulcus margins
the entire ridge!
Fossa for lacrimal gland
houses lacrimal gland
slightly depressed area of frontal bone that joins the two superciliary ridges.
Frontal or Metopic suture
only the part of the highlighted bone within the eye socket
What is this area (not anterior cranial fossa, but part of a single bone)?
What are the special markings to note on it?
Orbital Plate of the Frontal Bone
- could consider it the "roof" of the orbits
- its impressiones digitataes ("finger impressions") correspond to the convolutions of the brain
#1, not the bone but the portion of it
Squamous Portion of Frontal Bone
area defined in red
supraorbital margin of frontal bone
tiny blue-marked area at top of eye socket
supraorbital notch, or foramen if it is more hole-like
Trochlear pit or fossa
Frontal tuber or eminence
Tiny green area in anterior of skull here:
What bones make it up?
- made up of alae of crista galli (of ethmoid) and frontal bone
- transmits emissary vein from nose to sup. sagittal sinus but is frequently closed
What is this hole and what does it connect?
- connects external base of skull to posterior cranial fossa
piri form aperature
know: Foramen Magnum, Occipital Condyles, Superior/ Inferior Nuchal Lines
Clivus of Occipital Bone
- slopes downward posteriorly from the sella turcica of the sphenoid
articulate with atlas vertebra
External occipital protuberance