The Vertebral Column and Thoracic Cage · C-1 the Atlas The superior arLculang facets receive the...

Bio230Dr.CarlaSweet

TheVertebralColumnandThoracicCage

7

12

5

5

4

AxialSkeleton:protectsthebrain,spinalcord,andvisceralorgansofthechest

Vertebrae:conductbodyweighttothelowerlimbsLowervertebraearelargerandstronger:

becausetheybearmoreweight

4VertebralCurvaturesseenintheadult

2°

1°

2°

1°

GeneralCharacterisLcsofaTypicalVertebra

Thevertebralbody:transfersweightalongthespine

Thevertebralarch:posteriormarginofvertebralforamenGreenindiagram.

ThearLcularprocesses:lateralprojecLonsbetweenlaminaeandpedicles

Ar9culatedvertebrae

Besuretounderstandthedifferencebetween:1.  vertebralforamen2.  intervertebralforamen3.  vertebralcanal

GeneralRegionalCharacteris9csofVertebrae

Cervicle7-(typical)-haveatransverseforamenIneachtransverseprocess-thespinousprocessofC3-6Areshort&bifed

Thoracic-12--havearLcularfacetsforribs(bingo!)-thespiniousprocessestendtobelong,slender&pointdownward

Lumbar-5--havelargebodies-thickbluntspiniousprocesses

VertebralRegions-Vertebraearenumbered:byregion,fromtoptoboXomC1arLculateswithskull,L5withsacrum

Vertebraeofeachregion:havecharacterisLcsdeterminedbyfuncLons

Nerverootsoffthespinalcordleavingtheintervertebralforamen

Herniateddisc,compressingonnerve!Whatregionisthisfrom?Lookatvertebra

_____lamina

IntervertebralDiscs

-ArepadsoffibrocarLlage-Separatethevertebralbodies-Absorbshocks

The Cervical Vertebrae (C1-C7)

• C1(atlas)hasnobodyorspinousprocess• smallbodiesontherestofcervicalvertebrae(supportonlyhead)

Whoisthisman?AndwhyisheincludedIn

thisstudyoftheVertebralColumn?

HeisATLAStheGreekGodwhosupportedtheworld!

WeeachhaveourownAtlasThatsupportsuseveryday.

MeetC-1……..AKA…….ATLAS

YourheadsitsOnyourownAtlas!GivethankstothisMightyvertebraC-1ROCKS!

WhatistheAtlasarLculaLngwithontheskull?

C-1theAtlasThesuperiorarLculaLngfacetsreceivetheoccipitalcondylesToformtheAtlanto-OccipitalJoint

-theAtlashasnospinousprocess-hasnobody(whoneedsabodywhenyousupporttheworld!)

C1(Atlas)meetsC2(Axis)andnowwecanrotateourheads!

DensisGreekfor“Tooth”-theDenslookslikeatooth(DenLst)

The Thoracic Vertebrae (12) all articulate with the ribs

The Lumbar Vertebrae (5)

1.  largestvertebrae2.  oval-shaped,largebodies(supportrestofvertebralcolumn)

The Sacrum and Coccyx

Figure 7–21

Sternum

Clavicularnotches-----------(arLculatewithclavicles)

Jugularnotch-------------

lateralview

Sternalangle-wheremanubriumarLculateswithbody.Canfeelthis______________________.Clinicallyimportant,siteofrib#2.

Sternum=thefusionof3bones1.manubrium2.body3.xyphoidprocess

Ribcage=sternum+ribs

Next…theappendicularskeleton!