The brachial plexus is formed from the anterior divisions of the lower cervical spinal nerves C5-C8 and the first thoracic nerve T1. It is divided into roots, trunks, divisions, cords, and branches. The roots combine to form three trunks, which each divide into anterior and posterior divisions. The divisions then recombine into three cords - lateral, posterior, and medial. The cords give rise to branches that innervate muscles of the chest, shoulder, arm, and forearm.

1. 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 nerveT1
 STRUCTURE
 Brachial plexus is divided into roots, trunks,
divisions, chords and branches

2.  Roots ;the lower four cervical nerves
C5,C6,C7 and the upper first thoracic nerveT1
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 andT1 merge to form the lower trunk

3.  The C5, and C6 merge to form the upper
trunk
 The C7 remains continuously to form the
medial trunk
 The C8 , and theT1 merge to form the lower
trunk of the brachial plexus

4.  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

5.  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

6.  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

7.  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

8.  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

9.  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

10.  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

11. General description of
brachial plexus showing
the roots, trunks ,division,
and cords

12. BRACHIAL PLEXUS
The full caption of the
brachial plexus
showing the roots,
trunks ,divisions, cords
and the branches