Flashcards in Brachial Plexus Part 1 Deck (33)
Which anterior primary rami form the brachial plexus in order to supply the upper extremities?
C5-T1 (may also receive some fibers from C4 and/or T2)
Which rib does the brachial plexus travel across to reach the axilla?
What do roots combine to form?
What do trunks divide into?
What do divisions form?
What do cords divide into?
T/F: Each root of the brachial plexus receives a white ramus communicans from the sympathetic trunk.
False; should say gray ramus communicans
Which scalene muscles do the roots of the brachial plexus pass between going into the posterior triangle?
anterior and medial scalene
How do the roots of the brachial plexus pass the subclavian artery?
posterior and superior
Which roots combine to form the superior trunk? middle trunk? inferior trunk?
C5 and C6;
C8 and T1
What structure do the trunks of the brachial plexus pass over to get into the axilla?
What does each trunk of the brachial plexus split into?
anterior and posterior divisions
T/F: anterior divisions of the brachial plexus will supply the anterior compartments while the posterior divisions will supply the posterior compartments of the arm and forearm.
Cords of the brachial plexus are named for their relationship to what structure?
What is the lateral cord of the brachial plexus formed by?
anterior divisions of the superior and middle trunks
T/F: the lateral cord contains fibers from C4, C5, and C6.
False; should say C5-C7
Which cord of the brachial plexus lies lateral to the second part of the axillary artery?
Which cord of the brachial plexus is formed by the anterior division of the inferior trunk?
T/F: the medial cord contains fibers from C7, C8 and T1.
False; just C8 and T1 typically
What cord lies medial to the second part of the axillary artery?
Which cord of the brachial plexus is formed by all three trunks?
What roots cord levels supply fibers to the posterior cord?
Which cord lies posterior to the second part of the axillary artery?
What two nerves are formed from the roots of the brachial plexus?
dorsal scapular nerve and long thoraic nerve
What nerve is formed from the fibers from C5 only?
dorsal scapular nerve
What muscles are supplied by the dorsal scapular nerve?
levator scapula, rhomboid minor, and rhomboid major
What muscle is supplied by the dorsal scapular nerve and also receives fibers from C3 and C4?
What roots from the long thoracic nerve? What muscle is supplied?
What do all of the muscles supplied by the dorsal scapular nerve and the long thoracic nerve have in common?
all attach to medial border of scapula