Brachial Plexus - Part 1 Flashcards
The brachial plexus if formed by what?
Anterior primary rami of C5-T1
The brachial plexus can also receive fibers from what?
C4 and/or T2
The brachial plexus travels laterally over what?
Rib 1
After traveling laterally over rib 1, the brachial plexus enters what?
The axilla
Traveling medial to lateral, roots _____ to form what?
combine
trunks
Traveling medial to lateral, trunks _____ to form what?
divide
divisions
Traveling medial to lateral, divisions ____ to form what?
Combine
cords
Traveling medial to lateral, cords ____ into what?
divide
Terminal nerves
Each root receives what? From where?
Gray ramus communicans
Sympathetic trunk
How many cervical sympathetic ganglia are there? Names?
3, superior, medial, inferior
The roots pass between what? Into what?
Anterior and middle scalene muscles
Posterior triangle
The roots are _____ and _____ to what structure?
Posterior and superior
subclavian artery
What combines to form the superior trunk?
C5 and C6
What combines to form the middle trunk?
C7 - stays alone
What combines to form the inferior trunk?
C8 and T1
Trunks pass over what?
Rib 1
The trunks pass over rib 1 into what?
axilla
At which part of the brachial plexus does it become compartmentalized?
divisions
Each trunk splits into what?
An anterior and posterior division
Anterior division supply what?
Anterior compartment of arm
Posterior division will supply what?
Posterior compartment of the arm
What are the cords named for?
Relationship to axillary artery
This cord is formed by the anterior divisions of the superior and middle trunk.
Lateral cord
The lateral cord contains fibers from what?
C5, C6, C7
The lateral cord lies lateral to what?
Second part of the axillary artery
The medial cord is formed by what?
The anterior division of the inferior trunk
The medial cord contains fibers from which nerves?
C8 and T1
The medial cord lies _____ to the axillary artery
medial
The posterior cord is formed by union of what?
Posterior division of all three trunks
The posterior cord contains fibers from which nerves?
C5-C8, T1
The posterior cord lies _____ to the axillary artery.
posterior
What two nerves are formed from roots of the brachial plexus?
Dorsal scapular nerve
Long thoracic nerve
The dorsal scapular nerve branches off what?
The C5 root
The dorsal scapular nerve contains fibers from ?
C5 only
The dorsal scapular nerve supplies three muscles.
levator scapular
rhomboid major
Rhomboid minor
Rhomboid major is supplied by dorsal scapular nerve but also receives fibers from what nerves?
C3 and C4
The long thoracic nerve is formed by what?
The roots of C5, C6, and C7
The long thoracic nerve contains fibers from what nerves?
C5, C6, C7
The long thoracic nerve supplies which muscle?
serratus anterior
What two nerves branch off of the superior trunk?
suprascapular nerve
Nerve to the subclavius
