Upper limb 1: Brachial plexus Flashcards
(36 cards)
The brachial plexus is formed from which ventral rami?
C5 - T1
The brachial plexus emerges from between which 2 muscles?
Scalenus anterior
Scalenus medius
The cords of the brachial plexus are wrapped around what?
Axillary artery
Compression of the interscalene groove can result in which pathology?
Thoracic outlet syndrome
Which muscle is a useful landmark to determine where the important structure in the axilla are positioned?
Coracobrachialis
What is the brachial plexus wrapped in?
Axillary sheath
The axillary sheath connects to a fascial space which surrounds what?
Vertebral column
The axillary nerve is associated with which anatomical part of the humerus?
With which artery?
Neck of the humerus
Posterior circumflex humoral artery
The radial nerve is associated with which bony landmark of the humerus?
With which artery?
Spiral groove (posterior)
Profunda brachia artery
The median nerve is associated with which artery?
Brachial artery
What are the 5 parts the brachial plexus can be divided into?
Roots
Trunks
Divisions
Cords
Branches
Which 2 ventral rami form the upper trunk of the brachial plexus?
C5 + C6
Which ventral rami forms the middle trunk of the brachial plexus?
C7
Which 2 ventral rami form the lower trunk of the brachial plexus?
C8 + T1
What are the 2 divisions of the brachial plexus?
Anterior
Posterior
What are the 3 cords of the brachial plexus?
Lateral
Posterior
Medial
What are the 5 main branches of the brachial plexus?
Musculocutaneous nerve
Median nerve
Radial nerve
Ulnar nerve
Axillary nerve
Which 3 nerves form the ‘M’ shape at the end of the brachial plexus?
Musculocutaneous
Median
Ulnar
The radial nerve carries which nerve rami?
C5 - T1 (all)
Which 2 rami is brachioradialis innervated by?
C5 + C6
Which 2 rami are the triceps innervated by?
C7 + C8
Which part of the brachial plexus is most commonly involved in thoracic outlet syndrome?
Lower trunk
A lung apex tumour is most likely to compress which root of the brachial plexus?
T1
Which part of the brachial plexus is damaged in Erb’s palsy?
C5 / C6 roots / upper trunk