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Brachial Plexus
By Dr. M. Tracy-Bee
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Why do we learn about the brachial
plexus
Its one o the !ost i!portant structures
"i#in" ner#ous supply to !ost o the
structures in the upper li!b
$ou can read about it in your notes% but let
!e "i#e you so!e ad#ice in how to learn
it% understand it% and solidiy it into your
brain
&a#e a stron" understandin" o the
anato!y o the brachial plexus will ser#e
you well o#er your career and lie
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's we learn about the plexus% well reer
bac( to this dia"ra!% with the branches.
This is the one that you should learn well.
The plexus on the pre#ious pa"e in your
notes is helpul when startin" and learnin"
about the base structure
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)whoa* Thats a lot to learn+
$es% it see!s o#erwhel!in" to start% but i
you study and learn it in a si!ple way% it
will bac( this see! less co!plex.
,ets try
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&ere is an easy way to draw it%
draw strai"ht lines
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ow add two s!all lines
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ext% label the ra!i
C5
C6
C7
C8
T1
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This or!s the trun(s% lets write
the! in
C5
C6
C7
C8
T1
/pper trun(
Middle trun(
,ower trun(
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ow% draw out the posterior
di#isions co!in" to"ether to or!
the posterior cordC5
C6
C7
C8
T1
Posterior cord
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ow% draw out the anterior di#ision
headin" up to the upper trun(
C5
C6
C7
C8
T1
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,ets draw out both the0
anterior di#isions 1in purple2 and
posterior di#ision 1in blue2C5
C6
C7
C8
T1
3 h h i di i i
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3ee how the anterior di#isions o
the upper trun( and !iddle trun(
!a(e up the lateral cordC5
C6
C7
C8
T1
lateral cord
3 h th t i di i i
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3ee how the anterior di#isions o
the lower trun( !a(es up the
!edial cordC5
C6
C7
C8
T1
!edial cord
3 h th t i di i i ll
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3ee how the posterior di#isions all
co!e to"ether to !a(e up the
posterior cordC5
C6
C7
C8
T1
Posterior cord
Wh t h t
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What happens next
The !edial and lateral cord
co!bine to or!C5
C6
C7
C8
T1
Median ner#e
4e!e!ber that its the
Median ner#e
not the !edia, ner#e
Wh t h t
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What happens next
The !edial and lateral cord
co!bine to or!C5
C6
C7
C8
T1
Median ner#e
This is our )M+ that we see
in the lab
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,ets loo( at this on your dia"ra!
,earnin" the plexus
To help !e!ori5e the brachial plexus% well ind the )M+startin" at the ner#e that pierces the coracobrachialis!uscle.
,ets say it all to"ether
Musculocutaneous ner#e
,ateral cord
,ateral root
Median ner#e
Medial root
Medial cord
/lnar ner#eThe colors on the dia"ra!
correspond to the ones onthe list abo#e
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Dont or"et that posterior to this is the
P63T74I64 864D.
Its bi""est branch is the 4'DI', 7497
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,ets "o bac( to your drawin"% now we need
to add on :; the branches0
.C5
C6
C7
C8
T1This is our )M+ that we see
in the lab
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Draw in one line abo#e and below the upper
trun(C5
C6
C7
C8
T1This is our )M+ that we see
in the lab
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ow draw one line directed upward on the
top ? cordsC5
C6
C7
C8
T1
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'nd draw three lines directed downward on
the botto! ? cordsC5
C6
C7
C8
T1
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Thats a @uic( and easy way to
draw the plexus. I encoura"eyou to draw it out daily until you
ha#e it !e!ori5ed in your head.
'lso read throu"h the notes and
"o throu"h the re#iew.
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