skull mini ebook

7/28/2019 SKULL Mini eBook

1/19

There are approximately206 bones in your body

and 22* of them belongto your skull.

These bones, all irregularin shape, fit together likepuzzle pieces.

*Teeth, bone-like structures located in the skull, are not counted.
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2/19

Skull bones are either

part of the acial

skeleton (bones thatmake up the face)...

... or part of the

cranium (bones

that protect the

brain).Share this slideshow!

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3/19

The calvaria (skull cap)

is the upper part of the

cranium.

Each bone in the calvaria is

named for the correspondinglobe of the cerebrum -- thelargest part of the brain.

The rontal bone protects the frontal lobe.The parietal bones protect the parietal lobes.

The occipital bone protects the occipital lobe.

The temporal bone protects the temporal lobe.


4/19

The occipitalbone:

gives shape to the back of the skull.

protects the occipital lobe.

gives passage to the medullaoblongata.

The oramen magnum is the nameof the opening in the occipital bonethrough which the brain and spinalcord connect.

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5/19

In addition to protecting the

corresponding lobes of thebrain, the temporal bones

have openings that connect thestructures of the inner and

outer ears.

Factoid

:Thepoin

tedproje

ctionsy

ouseeatt

he

bottomofthetemp

oralbonei

scalledth

estyloid

process.

Musclesofthene

ckande

xtrinsic

tonguea

ttachthere

.


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6/19

A suture is a fbrous joint

found only in the skull. The

parietal bones (in blue) cometogether to form the sagittal

suture and also form the

coronal suture with thefrontal bone.

Factoid:thereare17suturesintheskull.


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7/19

The sphenoid and the ethmoidare not part of the calvaria but are

part of the cranium. They protectthe underside of the brain.

The sphenoid is a bat-shaped boneand is the keystone bone at thebase of the cranium.


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8/19

The ethmoid is a spongy, cubed bone that gives shape

to part of the roo o the nose and the orbits.

The ethmoid is also home to

numerous oramina throughwhich the branches of the

olactory nerves pass.

Factoid:Th

ecribifo

rmplate

oftheethmoid

supportst

heolfact

orybulb

(thetermi

nusof

theolfacto

rynerve).


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9/19

While the rontal bone gives shape to the forehead, orbits, and nasalcavity, it is not part of the facial skeleton. It is part of the calvaria.

The frontal bone articulates with 12 other bones (10 of the 12

belong to the facial skeleton).


10/19

Beore moving on, keep this in mind:

8 bones form the cranium 14 bones form the facial skeleton


11/19

The horseshoe-shaped

mandible is the largest

and strongest of the

acial bones.

It is also the only moveable bone of

the skull. The mandible articulateswith the temporal bones at the

temporomandibular joint.Share this slideshow!

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12/19

The maxillae form the

upper jaw and the boundary

of three cavities:

the roof of the mouth.

the floor and lateral wall of the nasal cavity.

the floors of the orbits.


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13/19

Each zygomatic bone

forms the prominence of acheek (the cheekbones).

Factoid

:People

withhigh

cheekb

onessi

mplyha

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bonest

hatare

closer

totheor

bits.


14/19

The nasal bones make up

thebridge o the nose

andattach to the nasal cartilage.

The lacrimal bones (inside

the orbits) contain the lacrimalsacs that continue as thenasolacrimal ducts, or tearducts.

The nasal and lacrimal bones are some ofthe smallest bones to make up the facialbones.


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15/19

The thin vomer bone forms thelower part of the nasal septum.

The superior hal of the vomer is fused

with the perpendicular plate of theethmoid, and its lower hal attaches tothe septal cartilage.

The posterior border is free andseparates the choanae, also known asthe internal nares.


16/19

The nasal conchae

consist of a layer of spongy

bone curled up on itself like

a scroll.

The medial surace of the conchae areperorated for the passage of numerousvessels.

The olds of the conchae increase thesurace area of the nasal cavities.This enhances the warming andhumidifying air passing over them.


17/19

The palatine bones are

located in the back of thenasal cavity.

The posterior borders of thepalatines serves as the attachmentsite of the sot palate, and the sharpmedial borders form the posteriornasal spine for the attachment of the

uvula.


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18/19

Can you name these bones?


19/19

Use 3D Human Anatomy Atlas 2 foryour iPad, iPhone, Android, PC or Mac.

Watch the calvaria and the frontal bone

with a clip from Atlas 2.
http://www.visiblebody.com/atlas_overviewhttp://www.visiblebody.com/iphone_overviewhttp://www.visiblebody.com/atlas_android_overviewhttp://www.visiblebody.com/download_overviewhttp://www.youtube.com/watch%3Fv%3DuWrUsqS5Fq4http://www.visiblebody.com/http://www.youtube.com/watch%3Fv%3DuWrUsqS5Fq4http://www.visiblebody.com/download_overviewhttp://www.visiblebody.com/atlas_android_overviewhttp://www.visiblebody.com/iphone_overviewhttp://www.visiblebody.com/atlas_overview

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