Sacral Plexus

Front 1

which nerve innervates iliopsoas? significance?

Back 1

femoral n.
iliopsoas is a strong flexor of the hip joint, damage will result in lack of patellar reflex

Front 2

caudal cutaneous sural n.

Back 2

branch of sciatic nerve; related to the distal caudal femoral vein and the popliteal lymph node

Front 3

branching point of peroneal nerve

Back 3

between biceps femoris and later head of gastroc; very superficial, lacerations to stifle may cause damage

Front 4

damage to sciatic n. at hip level

Back 4

paralysis of muscles around hip joint
animal may be unable to flex/extend hock
might have weak extension of hock because gracilis is innervated by the obturator n.
cutaneous deficits on caudal aspect of hind limb (stifle down), entire tarsus, except for digit 2

Front 5

damage to common peroneal n.

Back 5

paralysis of cranial tibial, LDE, lateral DE, peronus longus and brevis
animal will be unable to flex the hock or extend the digits
if only superficial or deep branch is damage, may still have sensory to the dorsal aspect of tarsus

Front 6

damage to tibial n.

Back 6

weak extension of the hock (semitendinosus, biceps femoris, and gracilis compensate)
total lack of digital flexion
sensory deficits in plantar region

Front 7

damage to femoral n.

Back 7

loss of patellar reflex
inability to fix stifle in extension (animal can't bear weight)
weak hip flexion (psoas major and tensor fascia latae compensate)

Front 8

unmasking of saphenous n.

Back 8

AZ zone extends from medial aspect of stifle all the way to digit 2, unmasked in case of total sciatic n. damage