ANATOMY BACK OF ARM PPT.ppt

ANATOMY OF POSTERIOR COMPARTMENT OF ARM

1. Posterior compartment of Arm
DR.M.VASANTHAKOHILA MBBS MD
FIRST YEAR POSTGRADUATE

2. INTRODUCTION
SYNOPSIS
POSTERIOR COMPARTMENT OF ARM
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:fromthelowerhalfoftheposteriorsurfaceof
theshaftofthehumerus
•Insertion:
•Intotheuppersurfaceoftheolecranonprocessoftheulna.
•NerveSupply:
•Fromtheradialnerve.
•Action:
•Extensionoftheforearmattheelbowjoint.

6. Radial Nerve
•Theoriginoftheradialnervefromtheposterior
cordofthebrachialplexusintheaxilla.
•Thenervewindsaroundthebackofthearminthe
spiralgroove.
•Inthespiralgroove,thenerveisaccompaniedby
theprofundavessels,anditliesdirectlyincontact
withtheshaftofthehumerus.
•Itpiercesthelateralfascialseptumabovethe
elbowandcontinuesdownwardintothecubital
fossainfrontoftheelbow,betweenthebrachialis
andthebrachioradialismuscles.

7. RADIAL NERVE

8. Branches of the radial nerve
Intheaxilla,
•Muscularbranchestothelongandmedialheadsofthe
triceps
•Posteriorcutaneousnerveofthearm.
Inthespiralgroove
•Muscularbranchestothelateralandmedialheadsofthe
tricepsandtotheanconeusmuscle.
•Thelowerlateralcutaneousnerveofthearm
•Theposteriorcutaneousnerveoftheforearm.
Intheanteriorcompartmentofthearm
•Muscularbranchestothebrachialis,thebrachioradialis,
andtheextensorcarpiradialislongusmuscles.
•Articularbranchestotheelbowjoint.

10. Ulnar Nerve
•Itisabranchofthemedialcordofthebrachialplexus
•Itpiercesthemedialfascialseptumanddescends
behindtheseptum,coveredposteriorlybythemedial
headofthetriceps.
•Thenerveisaccompaniedbythesuperiorulnar
collateralvessels.
•Attheelbow,itliesbehindthemedialepicondyleof
thehumerus.
•Itcontinuesdownwardtoentertheforearmbetween
thetwoheadsoforiginoftheflexorcarpiulnaris
Branches
•Theulnarnervehasanarticularbranchtotheelbow
joint

12. Profunda Brachii Artery
•Theprofundabrachiiarteryarisesfromthe
brachialarterynearitsorigin.
•Itaccompaniestheradialnervethroughthespiral
groove,suppliesthetricepsmuscle,andtakespart
intheanastomosisaroundtheelbowjoint.
•SuperiorandInferiorUlnarCollateralArteries
•Thesuperiorandinferiorulnarcollateralarteries
arisefromthebrachialarteryandtakepartinthe
anastomosisaroundtheelbowjoint.