Brachial Plexus Flashcards
Brachial subdivisions - “Radiology Techs Drink Cold Bevarages”
Roots Trunks Divisions Cords Branches
Branchial subdivisions - Classical numers
5-3-2-3-5
Branchial plexus - Rami that contribute
Classically C5-T1 ventral rami
What rami may contribute?
C4 and T2
What are the anatomical landmarks?
Neural foramen Interscalene triangle Lateral border of the first rib Medial border of the coracoid process Lateral border of the pectoralis minor muscle
Ventral roots - What fibers they carry?
Motor
Dorsal roots - What fibers they carry?
Sensitive
Where do the roots merge to form the spinal nerve?
Neural foramen (first landmark)
Anatomical landmark to identify the five nerve roots of the brachial plexus…
Proximal first rib
What’s the second anatomical landmark to identify the trunks?
Interscalene triangle
What muscles form the interscalene triangle?
Anterior and middle scalene
What roots make up the upper trunk?
C5 e C6
What roots make up the lower trunk?
C8 e T1
What root continues as the middle trunk?
C7
What trunks are superior to the subclavian artery?
Upper and middle
What trunk is posterior to the subclavian artery?
Lower
What’s the third anatomical landmark to identify the divisions?
Lateral border of the first rib
What happens to the divisions as they pass the lateral first rib border?
They divide into anterior and posterior divisions
What muscles the anterior division innervate?
Flexor muscles of the upper limb
What muscles the posterior division innervate?
Extensor muscles of the upper limb
What’s the fourth anatomical landmark to identify the cords?
Medial border of the coracoid process
How many cords do the divisions form?
Three: lateral, posterior and medial
What’s the anatomical reference for the cords positions?
Axillary artery
What’s the fifth anatomical landmark to identify the branches?
Lateral border of the pectoralis minor muscle
