Cranial Bones 0812

steven leeM.S. PathologyFTCC

vomer

mandible

Frontal bone

maxilla

Zygomaticbone


SupraorbitalForamen(frontal bone)

Middle nasal concha(ethmoid bone)

Inferior nasal concha

Infraorbital foramen(maxillary bone)

Perpendicular plate(ethmoid bone)

vomer

mandible

Frontal bone

maxilla

Alveoli processes(maxillary bone)

Alveoli processes(mandible)steven lee

M.S. PathologyFTCC


Perpendicular plate (ethmoid bone)

Mid

dle

nasa

l con

cha

(eth

moi

d bo

ne)

Infe

rior n

asal

con

cha

vomer

Infraorbital foramen(maxillary bone)



Inferi

or orb

ital fi

ssure

(max

illary

bone)

Superior orbital fissure

(sphenoid bone)

Optic foramen or canal (sphenoid bone)


When the supraorbital foramen is not completely enclosed by bone, there is a supraorbital notch, ratherthan a foramen, on the orbital rim, as is the case forthis specimen.


Optic canals permit passage of the optic nerves from the eyes to the brain.


The inferior orbital fissurepermits passage of cranial nerves and blood vessels.


The superior orbital fissurepermits passage of cranial nerves and blood vessels to the orbit



Frontalbone

Parietal bone

Temporal bone

Zygomaticbone

mandible

Occ

ipita

l bon

e

nasal

lacrimal

maxilla


Frontalbone

Parietal bone

Zygomatic process(Temporal bone)

Temporal processZygomatic bone

mandible

Occ

ipita

l bon

e

nasal

lacrimal

maxilla

Mastoid process(temporal bone) Styloid process

(temporal bone)

External occipitalprotuberance

External auditory meatus(temporal bone)

angle

ramus

Zygomatic process(frontal bone)

Frontal process(zygomatic bone)

Condylar process(mandible)

Coronoid process(mandible)

Coronal suture



Temporal bone

Frontal bone

Zygomatic bone

mandible

Temporal

process

(zygomatic

bone)Zygomatic process

(temporal bone)

Zygomatic process(frontal bone)

Frontal process(zygomatic bone)

Zygomatic arch

Sphenoid bone

Ethmoidbone

Condylar process(mandible)

Coronoid process(mandible)Mandibular notch

Nasal bone

Lacrimal bone

maxillasteven leeM.S. PathologyFTCC


Parietal bone

Parietal bone

Occipital bone

Lambdoidal suture

External occipitalprotuberance

Sagittal suture

Mastoid process(temporal bone)

Styloid process(temporal bone)



Sagittal suture

Coronal suture

Frontal bone

Parietal bone

Parietal bone

Occipital bone



Lesser wing (sphenoid bone) Greater wing(sphenoid bone)

Foramen magnum surroundsthe connection between the brain and spinal cord.


Foramenmagnum

Lesser wing (sphenoid bone)Foramen ovale(sphenoid bone)

Foramen spinosum(sphenoid bone)

Foramen lacerum(sphenoid bone)

Location of foramen rotundum (sphenoid bone), although not shown on this model

Greater wing(sphenoid bone)

Petrous portion

(temporal bone)Petro

us po

rtion

(tempo

ral bo

ne)

Internal occipitalprotuberance



Crista galli(ethmoid bone)

Cribiform plate(ethmoid bone)

Lesser wing (sphenoid bone)

Sella turcica (sphenoid bone)


Crista galli(ethmoid bone)

Lesser wing (sphenoid bone)

Sella turcica (sphenoid bone)

The falx cerebri, a membrane that stabilizes theposition of the brain, attaches to this ridge.

Greater wing(sphenoid bone)



Optic canal(sphenoid bone)

The hypophyseal fossa, the depression within the sella turcica houses and protects the pituitary gland.



nasalLacrimal canal(lacrimal bone)

mandible

Mastoid process (temporal bone)

Internal acoustic canal(temporal bone)

Petrous portion(temporal bone)

Squamous portion

(temporal bone)

angle

ramusbody

Alveoli processes(maxillary bone)

Lesser wing(sphenoid bone)



Internal auditory meatus(temporal bone)Petrous portio

n (temporal bone)

The internal auditory canal (meatus) carriesblood vessels and nerves to theinner ear.



Foramen magnum

Palatine process(maxilla)

Palatine bones

mandib

le

Zygomatic arch

External occipitalptotuberance

Occipital condylessteven leeM.S. PathologyFTCC

Occipital condyles

Occipital condyles are the site of articulation between the skull andthe 1st cervical vertebrae (atlas).



Palatinebone

Palatinebone

Palatine process(maxillary bone)

mandible



vomer

Pterygoid plates(sphenoid bone)

laterallateral

medial medial

Foramen magnum

Pterygoid processes



mandible

maxilla

Cor

onoi

d pr

oces

s

Condylar process

Mandibular notch

Mandibular angle

ramus

body

Mandibular alveoli processes

Maxillary alveoli processes

Mental protuberance

Mentalforamen

Oblique line



Maxillary bone

Alveoli processes

mandible

Alveoli processessteven leeM.S. PathologyFTCC

FETAL SKULLsteven lee

M.S. PathologyFTCC

At birth, there are 2 frontal bones that articulate along the metopic suture. Although the suture generally disappears by age 8 as the bones fuse, the adult skull commonly retains traces of the suture line.

Metopic suture



Frontal fontanel(anterior)

Parietal bone

Parietal bone

Frontal bone



Parietal bone

Parietal bone

Occipital bone

Occipital fontanel(posterior)



Parietal bone

Sphenoidal fontanel(anterolateral)

Mastoidal fontanel(posterolateral)steven lee

M.S. PathologyFTCC

Cranial Bones 0812

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