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Brachial Plexus

Brachial Plexus



It originates in the neck, descends into the axilla, posterior to the clavicle and then finally to the upper limb, or shoulder region via its branches. It can be divided into:

(a).supraclavicular parts

- roots, trunks,

(b). infraclavicular parts

- cords, terminal branches

FUNCTIONS

Provides nerve fibres which supply:

joints of the upperlimb

muscles of the upperlimb

(except trapezius muscle)

some skin of the upper limb

ROOTS

- 5 roots

- ventral rami of C5 - T1

- located in the neck

- deep to anterior scalene muscle

TRUNKS

- 3 trunks

- formed from roots

- lie above the clavicle

(a). upper trunk (C5 + C6)

(b). middle trunk (C7)

(c). lower trunk (C8 + T1)

DIVISIONS

- 6 divisions

- lie behind the clavicle.

- each trunk divides into:

(a). anterior division

(b). posterior division

*CORDS*

- 3 cords

- lie below the clavicle

- named according to their relationship with *axillary artery*

*(a) lateral cord

*(b) medial cord

*(c)posterior cord

LATERAL CORD

Formed from:

anterior divisions of the

upper trunk & middle trunk

MEDIAL CORD

Formed from:

anterior division of lower trunk

POSTERIOR CORD

Formed from:

posterior divisions of all trunks

i.e; upper, middle & lower trunks

*BRANCHES*

FROM ROOTS

1. dorsal scapular nerve

2. long thoracic nerve

3. branch to phrenic nerve

4. branch to longus coli & scalenes

FROM TRUNKS

5. suprascapular nerve

6. nerve to subclavius

FROM CORDS

(a).From lateral cord

7. lateral pectoral nerve

8. lateral root of median nerve

9. musculocutaneus nerve

(b). From medial cord:

10. medial pectoral nerve

11. medial cut. nerve of arm

12. medial cut. nerve of forearm

13. medial root of median nerve.

14. *ulnar nerve

(c).From posterior cord:

15. upper subscapular nerve

16. lower subscapular nerve

princedaniel Prince Daniel(Legend) Did you learn anything? Yes No        

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The anterior axillary fold is formed by -----------