Innervation of Upper Limb Flashcards
What are BBC muscles innervated by?
musculocutaneous nerve
What is the triceps innervated by?
Radial nerve
What re all muscles in the posterior forearm innervated by?
Radial nerve
What is the brachial plexus?
Network of nerve fibres that supplies the skin and musculature of the upper limb
Good mnemonic for brachial plexus
Read That Damn Cadaver Book
What does the mnemonic stand for?
Roots, trunks, divisions, cords, branches
What are the roots?
C5, C6, C7, C8, T1
How many trunks are there?
3
What are the names of the trunks?
Superior, middle, inferior
Which roots form the superior trunk?
C5 and C6
Which roots form the middle trunk?
C7
Which roots form the inferior trunk?
C8 and T1
How many branches does each trunk divide into?
2, one going anteriorly (towards the front of the body) and one going posteriorly (towards the back of the body)
Where are the cords of the brachial plexus?
In the axilla
What are the three cords named relative to?
Their position relative to the axillary artery
What is the lateral cord formed by?
Anterior division of the superior trunk
Anterior division of the middle trunk
What is the posterior cord formed by?
Posterior division of the superior trunk
Posterior division of the middle trunk
Posterior division of the inferior trunk
What is the medial cord formed by?
The anterior division of the inferior trunk
Five main nerves of upper limb
Musculocutaneous Axillary Median Radial Ulnar
Roots of musculocutaneous nerve
C5, C6, C7
Motor functions of musculocutaneous
Innervates brachialis, biceps brachii and coracobrachialis
Roots of axillary nerve
C5 and C6
What does the axillary nerve innervate?
teres minor and deltoid
Roots of median nerve
C6-T1
Roots of radial nerve
C5-T1
Roots of ulnar nerve
C8 and T1
What is the axillary nerve responsible for?
Abduction from 15 to 90
What is the deltoid innervated by?
Axillary nerve
What innervates teres major
Lower subscapular nerve
