- In a prefixed plexus, the contribution by C4 is large and that from T2 is often absent.
- In a postfixed plexus, the contribution by T1 is large. T2 is always present, C4 is absent, and C5 is reduced in size.
Easy Way To Remember Brachial Plexus With Mneumonics.
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From proximal to distal, brachial plexus consists of:
R for Roots (C5-T1)
T for Trunks (Upper, Middle and Lower)
D for Divisions (Anterior and Posterior from each of 3 trunks)
C for Cords (Lateral, Posterior and Medial)
B for Branches.
A) Branches of the Roots.
Mnemonic: “She looks pretty sexy & rude.”
1) She for Serratus anterior nerve(C5-C7)
2) Looks for Longus colli(C5-C8)
3) Pretty for Phrenic(C4)
4) Sexy for Scaleni muscles (C5-C8)
5) Rude for Rhomboids (C5)
B) Branches of the Trunks.
1) Sub-clavius (C5-C6)
2) Suprascapular (C5-C6)
(Remember Sup, note- b because p is inverted b)
C) Branches of cords
1) Branches of lateral cord.
Mnemonic: “Look miss look.”
a) Look for Lateral pectoral (C5-C7)
b) Miss for Musculocutaneous (C5-C7)
c) Look for Lateral root of median (C5-C7)
2) Branches of medial cord.Mnemonic: “M4U” or “Money For You” note: For is Four(4).
a) Medial Pectoral (C8-T1)
b) Medial cutaneous nerve of arm (C8-T1)
c) Medial cutaneous nerve of forearm (C8-T1)
d) Median root of median (C8-T1)
e) Ulnar (C7-T1)
3) Branches of the posterior cord.
a) U for Upper Subscapular (C5-C6)
b) L for Lower Subscapular (C5-C6)
c) N for Nerve to latissimus dorsi (C6-C8)
d) A for Axillary (C5-C6)
e) R for Radial (C5-T1)
Please note: ULNAR is mnemonic for branches of posterior cord, there is no involvement of ulnar nerve here.
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