ANATOMY
4
Upper Limb - Nerves
1.
Of the Brachial plexus what is INCORRECT?
a.
Divisions forming behind clavicle and entering anterior
Triangle
F – Divisions have noithing to do with it
b.
Cords embrace 2
nd
part axillary artery
T – named in relation to axillary artery
c.
Cords enter axilla anterior to axillary artery.
F
d.
Branches of cords surround 3
rd
part of axillary artery
T – p709-717
e.
Erbs palsy results in medially rotated arm with elbow
flexion
F – c5-c6 deltoid, brachioradialis, brachialis and biceps(adducted shoulder, med
rotated arm and extended elbow) p716
f.
Ulnar nerve palsy (probably writing as C7/T1)
gives interossei weakness and numbness over radial
part of hand
F – gives ulna part of hand p759
g.
Injury proximal to trunks will not affect
supraspinatus/infraspinatus
F – Suprascapular nerve comes off anterior division of superior trunk therefore
injury proximal to trunks will knock them out
h.
Fall onto the shoulder damages C8/T1
F
i.
Pec major only muscle that can test all roots
T – C5-T1
j.
suprascapular nerve is C5,6
T
k.
nerve to subclavius is C5, 6
T
l.
serratus anterior supplied by C6/7/8
F – C5,6,7
m.
all branches originate from roots, divisions or cords
F – The early ones come off early eg dorsal scap n comes off venral ramus of
C5
n.
suprascapular nerve comes off the posterior cord
F
o.
dorsal scapular nerve comes off C5
T
p.
is contained in the anterior triangle of the neck
F - the roots are in the posterior triangle of the neck and leave through the
gap between anterior and middle scalene p708
q.
there are 7 divisions of the trunks
F- No 6
r.
the nerve to subclavius is the only trunk
F - No it is a branch coming off a trunk
s.
the radial nerve is derived from C7,8,T1
F - No it is C5-T1
t.
the axillary nerve is derived from the lateral chord
F- No it is from the posterior cord
u.
the roots lie between the scalene muscles
T - p 708
2.
Injury to the middle trunk of the brachial plexus
a.
will mean C8 sensation will be affected
F - No
b.
will manifest in the medial chord
F - Wrong
c.
will affect the long thoracic nerve
F - Wrong. It comes off the roots
d.
will affect the median nerve
T
e.
all of the above
F
3.
In the upper limb, which is CORRECT? P682
a.
Upper arm recieves supply from T4
F - Wrong
b.
upper arm and forearm supplied by C3,4,5,6,7,8,T1
F - Wrong not C3
c.
upper arm dermatomes are C4,5,8,T1
T -C4 is in neck. ?? Could this be best answer??
d.
elbow flexion is C7,8
F - No. C5,6
e.
thumb dermatome is C8
F - No, C6
4.
Which myotome is incorrect:
a.
C5 shoulder adduction.
F - Adduction is C6,7
5.
Which movement of the arm does not involve C6
a.
Pronation
T – C7 via pronator quadratus and pronator teres
b.
Supination
F – C6 supinator and biceps brach
c.
shoulder adduction
F – C6,7,8
d.
wrist flexion
F – C6,7,8 (FCU + FCR)
e.
wrist extension
F – C6,7,8 (ECRL and brevis and ECU)
See 736, 737, 742, 793, 801, 806, 807