ANATOMY-- BACK OF ARM PPT.ppt

this presentation give detailed information about posterior compartment of arm.After read this presentation you have describe about muscles of posterior compartment of arm and blood supply and nervous innervation , action of posterior compartment.Also clinical importance of posterior compartment

1. DR.M.VASANTHAKOHILA MBBS MD
FIRST YEAR POSTGRADUATE

2. INTRODUCTION
MUSCLE
NERVE SUPPLY
BLOOD VESSELS
FUNCTION

3. Contents of the Posterior
Compartment of the Arm
•Muscle: The triceps muscle
•Nerve supply to the muscle: Radial
nerve.
•Blood supply: Profundabrachiiand ulnar
collateral arteries
•Structures passing through the
compartment
Radial nerve and ulnar nerve

4. Triceps muscle
•Origin:
•Longhead:fromtheinfraglenoidtubercleofthescapula.
•Lateralhead:fromtheupperhalfoftheposteriorsurfaceof
theshaftofthehumerus.
•Medialhead:fromthelowerhalfoftheposteriorsurfaceofthe
shaftofthehumerus
•Insertion:
•Intotheuppersurfaceoftheolecranonprocessoftheulna.
•NerveSupply:
•Fromtheradialnerve.
•Action:
•Extensionoftheforearmattheelbowjoint.

6. Radial Nerve
Theoriginoftheradialnervefromtheposteriorcordof
thebrachialplexusintheaxilla.
Thenervewindsaroundthebackofthearminthespiral
groove.
Inthespiralgroove,thenerveisaccompaniedbythe
profundavessels,anditliesdirectlyincontactwiththe
shaftofthehumerus.
Itpiercesthelateralfascialseptumabovetheelbowand
continuesdownwardintothecubitalfossainfrontofthe
elbow,betweenthebrachialisandthebrachioradialis
muscles.

7. RADIAL NERVE

8. Branches of the radial nerve
Intheaxilla,
•Muscularbranchestothelongandmedialheadsofthe
triceps
•Posteriorcutaneousnerveofthearm.
Inthespiralgroove
•Muscularbranchestothelateralandmedialheadsof
thetricepsandtotheanconeusmuscle.
•Thelowerlateralcutaneousnerveofthearm
•Theposteriorcutaneousnerveoftheforearm.
Intheanteriorcompartmentofthearm
•Muscular branchestothebrachialis,the
brachioradialis,andtheextensorcarpiradialislongus
muscles.
•Articularbranchestotheelbowjoint.

10. Ulnar Nerve
•Itisabranchofthemedialcordofthebrachialplexus
•Itpiercesthemedialfascialseptumanddescendsbehind
theseptum,coveredposteriorlybythemedialheadofthe
triceps.
•Thenerveisaccompaniedbythesuperiorulnarcollateral
vessels.
•Attheelbow,itliesbehindthemedialepicondyleof
thehumerus.
•Itcontinuesdownwardtoentertheforearmbetweenthe
twoheadsoforiginoftheflexorcarpiulnaris
Branches
•Theulnarnervehasanarticularbranchtotheelbowjoint

12. Profunda Brachii Artery
•Theprofundabrachiiarteryarisesfromthebrachialartery
nearitsorigin.
•Itaccompaniestheradialnervethroughthespiralgroove,
suppliesthetricepsmuscle,andtakespartinthe
anastomosisaroundtheelbowjoint.
•SuperiorandInferiorUlnarCollateralArteries
•Thesuperiorandinferiorulnarcollateralarteriesarise
fromthebrachialarteryandtakepartintheanastomosis
aroundtheelbowjoint.