Page 286 - Canine Lameness

Table 16.2 Summary of the major motor and sensory distribution of the brachial plexus.
Spinal cord Segmental spinal
Nerve segments Muscle innervated Motor function Cutaneous areas reflex Signs of dysfunction
Suprascapular C6, C7 Supra- and infraspinatus Extension and None None Little gait abnormality
lateral support Pronounced atrophy of
of the supraspinatus and
shoulder infraspinatus muscles
Brachiocephalicus C5, C6, C7 Cleidobrachialis Advance limb Lateral, cranial, and None Little gait abnormality
medial brachium Anesthesia of cranial brachium
Musculocutaneous C6, C7, C8 Biceps brachii, Flexion of the Craniomedial Biceps reflex, Little gait abnormality and
brachialis, and elbow antebrachium and withdrawal reflex weakened flexion of the elbow
coracobrachialis palmar aspect of the (flexion of elbow) Anesthesia of medial
paw antebrachium
Axillary C6, C7, C8 Deltoid and teres major Flexion of the None None Little gait abnormality
and minor shoulder Decreased shoulder flexion
during withdrawal reflex
Anesthesia of lateral brachium
Radial C6, C7, C8, Triceps brachii and Extension of Cranial aspect of Triceps reflex Loss of weight-bearing
T1, T2 extensors of carpus and the elbow, the antebrachium and (proximal) and Knuckling of paw
digits carpus, and dorsal aspect of paw extensor carpi Decreased extensor carpi
the digits radialis (distal) radialis and triceps reflexes
Anesthesia of cranial surface
distal to elbow

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