A plexus formed by ventral ramus of corresponding spinal nerves:
- Roots, trunks & divisions are supraclavicular
- Cords & branches are infraclavicular.
Branches from the roots:
- C5: Dorsal scapular nerve/ Nerve to Rhomboideus
- C5, C6, C7: Long thoracic nerve/ Nerve to Serratus anterior.
Branches from the trunk:
- Suprascapular nerve: Supplies supraspinatus & infraspinatus
- Nerve to subclavius.
.Branches of lateral cord (C5, C6, C7):
- Lateral pectoral nerve
- Lateral root of median nerve
- Musculocutaneous nerve.
Note: Coracobrachialis is supplied by C5,6,7 roots of musculocutaneous nerve.
Branches of medial cord (C8, T1):
- Medial pectoral nerve
- Medial root of median nerve
- Medial cutaneous nerve of arm
- Medial cutaneous nerve of forearm
- Ulnar nerve (C7, C8, T1) receives branch from lateral cord too.
Branches of posterior cord:
- Upper subscapular nerve (supplies subscapularis)
- Lower subscapular nerve (supplies subscapularis and teres major)
- Axillary nerve
- These 3 nerves have root value of C5, C6
- Nerve to Latissimus dorsi/ Thoracodorsal nerve (C6, C7, C8)
- Radial nerve (C5-T1) Continuation of posterior cord.
Integration with Anesthesia:
- Injection site: 1 cm above the midpoint of clavicle
- We know that roots, trunks & divisions are supraclavicular
- So, supraclavicular approach causes dense block.
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