Brachial Plexus Flashcards
Origin of Brachial Plexus
Anterior rami of spinal nerves c5 c6 c7 c8 t1
Order from inside the neck
rootlets, roots, spinal nerves, rami
Order from outside the neck
roots, trunks, divisions, chords, branches
Trunks
Upper, middle, lower
Divisions
anterior and posterior divisions from each upper middle and lower trunk
Lateral Cord origin
Anterior divisions from upper and middle trunks
Posterior Cord origin
Posterior divisions of all 3 trunks
Medial Cord origin
anterior division of lower trunk
Upper trunk origin
C5 and C6
Middle trunk origin
C7
Lower trunk origin
C8 and T1
2 Branches from the “roots” of the brachial plexus
Dorsal Scapular Nerve (C5)
- Levator Scapulae
- Rhomboids Major and Minor
Long Thoracic Nerve (C5-7)
- Serratus anterior
2 branches from “trunks” of the brachial plexus
Suprascapular Nerve (C5, C6)
- Supraspinatus
- Infraspinatus
Nerve to Subclavius (C5, C6)
- Subclavius
*upper trunk
3 Branches from the “lateral cord” of the BP
Lateral Pectoral Nerve
- Pectoralis Major and Minor
Musculocutaneous Nerve
- Biceps Brachii
- Bachialis
- Coracobrachialis
Median Nerve
- Anterior Forearm**
- Hand
5 Braches from the “medial cord” of the BP
Medial Pectoral Nerve
- Pectoralis Major and Minor
Medial Cutaneous Nerves of arm/forearm (2 branches)
Ulnar Nerve
- Anterior Forearm
- Hand **
Median Nerve
- Anterior Forearm **
- Hand
Posterior Cord travels
Behind Axillary Artery
5 branches from the posterior cord of the BP
Axillary Nerve
- Deltoid
- Teres Minor
Radial Nerve
- Extensors of upper limb
Thoracodorsal Nerve
- Latissimus Dorsi
Upper Subscapular Nerve (before Thor. N.)
- Subscapularis
Lower Subscapular Nerve (after Thor. N.)
- Subscapularis
- Teres Major
Anterior Arm innervation
Musculocutaneous
Posterior arm innervation
radial nerve
Anterior forearm innervation
median nerve **
ulnar nerve
Hand Innervation
Ulnar nerve **
median nerve
Posterior forearm
Radial Nerve
