Brachial Plexus Flashcards
Nerve, Origin, Branches, Supply
Dorsal Scapular Nerve
* Origin Anterior ramus of spinal nerve C5
* Branches None
* Supply Rhomboid major and minor, Levator scapulae
Nerve and course
Dorsal Scapular Nerve
* Pierces middle scalene
* Descends between levator scap on one side and serratus posterior superior and posterior scalene on the other
* Runs along medial scapular region, along anterior border of rhomboids
Nerve, Origin and Supply
Long Thoracic n.
* Origin Spinal nerves C5, C6, C7
* Supply Serratus anterior
Nerve and Course
Long Thoracic n.
Course
* Distal and lateral
* Deep to clavicle AND superficial to 1st and 2nd ribs
* Along anterior thoracic wall in midaxillary line
* Ends on superficial surface of serratus anterior
Nerve, Origin and Branches
Suprascapular n.
* Origin Superior trunk of brachial plexus (C5-6)
Supply
* Motor: Supraspinatous and Infraspinatus
* Sensory: Glenohumeral and acromioclavicular joints
Nerve and Course
- Transverses scapular notch (inferior to superior transverse scap lig) into supraspinous region of scap
- Gives off branch to supraspinous muscle
- Continues through greater scapular notch to reach infraspinatus fossa
- Terminates within infraspinatus muscle
Nerve, origin, supply
Subclavian n
Origin Superior trunk of brachial plexus (C5-C6)
Supply Subclavius muscle
Nerve, branch, supply
Lateral Pectoral n
Origin Lateral cord of brachial plexus (C5-C7)
Branches Muscular branches
Supply Pectoralis major and some of pec minor
Nerve, branch, supply
Medial Pectoral n
Origin Medial cord of brachial plexus (C8-T1)
Branches Muscular
Supply Pec major and minor
Nerve A, origin, supply
Medial Brachial cutaneous
Origin Medial cord/Inferior trunk of brachial plexus (T1)
Supply Skin overlying anteror part of medial arm
Nerve B, origin, supply
Medial antebrachial cutaneous
Origin Medial cord of th brachial plexus (C8-T1)
Supply Skin overlying medial forearm and olecranon
Nerves, branch, supply
Upper Subscapular n
Origin Posterior Cord of brachial plexus (C5-C6)
Supply Upper portion of subscapularis muscle
Lower Subscapular n
Origin Posterior cord of brachial plexus (C5, C6)
Supply Lower portion of subscap, Teres Major
- Course Both emerge to traverse anterior surface of subscap.
- Lower ends in teres major muscle
Nerve, origin, supply
Thoracodorsal
Origin Posterior cord of brachial plexus (C6, C7, C8)
Supply Lat Dorsi
Nerve, course
Thoracodorsal
Course
* Emerges between upper and lower subscap nerves
* With throacodorsal artery along posterior axillary wall
* Deep into lat dorsi
Name A
Posterior cord of brachial plexus
Name B
Lower Subscapular n
Name C
Thoracodorsal n
Name D (the top one)
Upper subscapular n
Name the bottom nerve (second D)
Long Thoracic n
Nerve, origin, innervation
Axillary n
Origin posteror cord of brachial plexus (C5-C6)
Innervation
* Motor - Deltoid, Teres minor
* Sensory - glenohumeral joint, skin of deltoid region/upper arm
Nerve, course
Axillary n
Course anterior to subscap m. Exits axilla with posterior circumflex humeral artery through quadrangular space
Nerve, Origin, Branches
Radial n
Origin Posterior cord of brachial plexus (C5-T1)
Branches
* Posterior brachial cutaneous
* Inferior lateral brachial cutaneous
* posterior antebrachial cutaneous
* musclar branches
* deep branch of radial nerve
* superficial branch of radial nerve
Nerve, Motor and Sensory Supply
Radial n
Motor Supply
* Triceps brachii
* Brachioradialis
* Extensor Carpi radialis longus
Sensory Supply
* Lower aspect and posterior surface of arm
* Central and posterior aspect of forearm
* Dorsal aspect of the radial 3-1/2 digits of the hand
Nerve, Origin and Supply
Musculocutaneous n
Origin Brachial plexus (C5-C7)
Supply
* Corocobrachialis
* Biceps Brachii
* Brachialis
