Does the obturator nerve innervate any areas of cutaneous sensation?
What can happen to the obturator nerve in cows during parturition? What affect does this have on the cows after parturition?
The obturator nerve can become crushed between the foetus and the pelvis. This commonly occurs with oversized calves.
The cows lose the ability to adduct their limbs and, as cows get up hindlimb first, this means they 'do the splits' and can easily give up and become a 'down cow'.
Why is a down cow such a problem? What do farmers sometimes do to help a down cow?
The weight of their abdominal contents compresses their muscles, which lose their blood supply and become damaged. Farmers sometimes will hoist their cow and suspend them from their hip bones as there is far better chance of them recovering if their circulation is not impaired.
Why is this not a common problem in horses?
Horses do not tend to have oversized foals and they get up forelimbs first
Describe the route of the femoral nerve
Short route to cranial thigh
What muscles does the femoral nerve innervate? And what is their function?
Quadriceps, iliopsoas, sartorius - hip flexors, limb protractors, stifle extensors
Does the femoral nerve innervate any areas of cutaneous sensation?
Yes - the saphenous branch innervates the medial thigh
What reflex is the femoral nerve responsible for innervating?
The patellar reflex
Describe the patellar reflex
Hit the patellar ligament and sensation travels up via the femoral nerve into the spinal chord where a shortcut occurs and information is sent back down into the leg to contract the quadriceps muscle.
What would damage to the femoral nerve result in?
The animal would be unable to extend the stifle and weight bear. The patellar reflex would also be lost.
Describe the route of the sciatic nerve
The sciatic nerve runs over the dorsal surface of the body of the ilium, passes caudal to the hip and runs deep to biceps femoris
What muscles does the sciatic nerve innervate? And what is their function?