MCQ – 69961

Root value of thoracodorsal nerve ‑

A.	C5,C6,C7
B.	C8,T1
C.	C6,C7,C8
D.	Ti T2

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Correct Answer � C Explanation

Ans. is ‘c’ i.e., C₆C₇C₈

Branches of brachial plexus

• Branches of brachial plexus arises from different anatomical segments : –

1. Branches of the roots

• Nerve to serratus anterior (long thoracic nerve) (C₅, ^C6, C7).
• Nerve to rhomboideus (dorsal scapular nerve) (C5).

2. Branches of the trunks

• These arise only from the upper trunk which gives two branches. I. Suprascapular nerve (C₅, C6)
• Nerve to subclavius (C₅, C6)

3.  Branches of the cords

1. Branches of lateral cord

• Lateral pectoral (C5-C7)
• Musculocutaneous (C5-C7)
• Lateral root of median (C5-C7)

2. Branches of medial cord

• Medial pectoral (C₈, T1)
• Medial cutaneous nerve of arm (C₈, TO
• Medial cutaneous nerve of forearm (C₈, Ti).
• Ulnar (C7, C8, T_i). C7 fibres reach by a communicating branch from lateral root of median nerve.
• Medial root of median (C₈, T1).

3. Branches of posterior cord

• Upper subscapular (C₅, C6)
• Nerve to latissimus dorsi (thoracodorsal) (C6, C7, CO
• Lower subscapular (C₅, C6)
• Axillary (circumflex) (C₅, C6)
• Radial (C₅-C₈, T1)