Brachial plexus summary
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Transcript of Brachial plexus summary
BRACHIAL PLEXUS
Brachial plexus is the network of nerves formed by anterior division of spinal nerves of the four lower cervical nerves (C5,C6,C7&C8)
And the first upper thoracic nerve T1 STRUCTURE Brachial plexus is divided into roots,
trunks, divisions, chords and branches
Roots ;the lower four cervical nerves C5,C6,C7 and the upper first thoracic nerve T1 forms the roots of the brachial plexus
Trunk; each root merge to form three trunks upper middle and the lower trunk
C5,and C6 merge to form the upper trunk
C7 remains to form the middle trunk C8 and T1 merge to form the lower
trunk
The C5, and C6 merge to form the upper trunk
The C7 remains continuously to form the medial trunk
The C8 , and the T1 merge to form the lower trunk of the brachial plexus
Division; each trunk split to form the posterior and the anterior divisions of the upper , middle and the lower trunk
Anterior and posterior division of the upper trunk, anterior and posterior division of the middle trunk ,anterior and posterior division of the lower trunk
Cords; the divisions of the upper, lower and the middle trunk re emerge to form the three chords namely lateral ,posterior, and medial chord
the anterior division of the upper and middle trunk merge to form the lateral cord ,the anterior division of the lower trunk remains continuously to form the medial chord , the posterior divisions of upper ,middle and
The lower trunk merge to form the posterior chord
There are three cords namely the lateral , posterior and the medial cord and they are named in relationship to their position from the axillary artery
Branches; branches are formed by the nerves these nerves are those which comes from roots, upper trunk, lateral cord, posterior cord and medial cord
Each nerve innervate/supply muscle at specific region of the body
from the roots; from C5,C6 and C7 there is a long thoracic nerve which supplies the serratus anterior muscle responsible to rise the rib cage, and the dorsal scapular nerve which innervates the levator scapulae, rhomboid major and rhomboid minor muscles
Only the upper trunk gives the branch. The upper trunk gives the suprascapular nerve which innervates the supraspinatus and infraspinatus muscles
divisions won’t give us the branches Branches from the cord from the cord there are nerves which
emerge from lateral , posterior and from medial chord
There are three branches from lateral cord namely lateral pectoral nerve , muscular
coetaneous nerve and ,median nerve There are five branches from the posterior
cord namely Upper sub scapular, thoracodorsal axillary,
radial nerve And the lower sub scapular nerve To remember the branches of the posterior
cord we normally use the mnemonic STAR
Upper S ubscapular Thoracodorsal nerve Axillary nerve Radial nerve Lower sub scapular nerve The medial cord gives five branches namely Medial ante brachial coetaneous nerve ,
medial brachial coetaneous ,medial pectoral , ulna nerve and the medial branch of median nerve
General description of brachial plexus showing the roots, trunks ,division, and cords
BRACHIAL PLEXUSThe full caption of the brachial plexus showing the roots, trunks ,divisions, cords and the branches