The brachial plexus is a network of nerves formed by the anterior rami of C5, C6, C7, C8, and T1, providing sensory and motor innervation to the upper limb and shoulder girdle, along with some autonomic functions. It consists of roots, trunks, divisions, cords, and branches, with specific anatomical locations in the neck and axilla. The cords are related to the axillary artery, and there are a total of 13 branches originating from the three cords.

1. Brachial plexus
Dr. Muhammad Bilal

2. Brachial plexus
Definition
Network of nerves formed by anterior rami of c5,c6,c7,c8, T1.
Function:-
1-Sensory innervation to upper limb.
2- Motor innervation to upper limb & shoulder girdle except Trapezius.
3- Autonomic functions

3. Parts of Brachial plexus:-
1. Root
2. Trunk
3. Divisions
4. Cords
5. Branches
Mnemonics
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4. Location of Brachial plexus
• Cervicobrachial position
• Roots, Trunks, & Divisions located
in posterior triangle of the neck.
• Cords & branches located in the
axilla

5. Location of the brachial plexus
Clavicle divides the plexus into 2 parts
Infraclavicular part
i. Cords
ii. Branches
Supraclavicular part
i. Roots
ii. Trunks
iii. Divisions

6. Relation with Axillary artery
• The cords of the plexus are named according relationship with the
second part of the Axillary artery
• Brachial plexus + Axillary artery + vein are enclosed together in a
connective tissue wrapping termed the axillary sheath.
• The medial cord crosses behind the artery to reach the medial side of
the second part of the artery .
• Posterior cord lies behind the second part of the artery.
• Lateral cord lies lateral to the second part of the artery

7. • Roots:- Anterior rami of C5,C6,C7,C8,T1.
• Trunks:- 3 trunks
I. Upper (2 branches)
II. Middle
III. Lower
• Divisions:- 6 division
I. 3 Anterior division from each trunk
II. 3 Posterior division from each trunk
• Cords:- 3 cords
I. Lateral cord
II. Medial cord
III. Posterior cord
• Branches:- 13 in numbers
I. 5 branches medial cord
II. 5 branches form posterior cord
III. 3 branches from lateral cord.

8. Roots
5 nerves root C5-T1.
2 branches
1. Dorsal scapular nerve.
2. Long thoracic nerve.
Dorsal scapular

9. Trunks
Upper trunk
Branches
1. Suprascapular nerve
2. Nerve to subclavius
• Middle & lower Trunk no branch

10. Divisions
6 divisions of each truck
1. 3 Anterior division from upper,
middle & lower trunk.
2. 3 Posterior division from
upper, middle & lower trunk.
No branch from division

11. Cords
3 Cords
1. Lateral cord :-anterior division of upper and
middle trunk.
2. Posterior cord:- posterior division of all the
3 trunk.
3. Medial cord:- anterior division of lower
trunk.

12. Branches
Lateral cord
3 branches
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1. Lateral pectoral
2. Musculocutaneous
3. Lateral root of median

13. Branches
Posterior cord
5 branches
ULTRA
1. Upper subscapular
2. Lower subscapular
3. Thoracodorsal nerve
4. Radial
5. Axillary

14. Branches
Medial cord
5 branches
Medals 4 u
1. Medial pectoral
2. Medial cutaneous nerve
of arm
3. Medial cutaneous nerve
of forearm
4. Medial root of median
nerve
5. Ulnar nerve

15. The end