76 VETERINARY STATE BOARD 



Describe the spinal accessory nerve. 



The eleventh pair of cranial nerves, spinal accessory, originate 

 along the whole cervical region of the cord, and from the fourth 

 ventricle. It enters the cranium through the foramen magnum 

 and escapes through the foramen lacerum to be distributed to the 

 muscles of the neck and thorax. It gives off the following branches : 

 to the cervical sjTnpathetie, stemomaxillaris, mastoidohiuneralis, 

 cervical and dorsal trapezius muscles and motor fibres to the vagus. 



Describe the hjrpoglossal or twelfth pair of cranial nerves. 



Originates in the medulla and leaves the cranium through the 

 condyloid foramen to be distributed to the muscles of the tongue and 

 depressor muscles of the larynx. 



Describe the formation of the brachial plexus. 



Formed from the inferior branches of the sixth, seventh and 

 eighth cervical and first and second dorsal spinal nerves. 



Give the nerve supply of the extensors of the forearm. 

 Radial. 



What is the nerve supply of the flexors of the forearm? 



Median. 



Describe the median nerve. 



The median nerve arises from the posterior part of the brachial 

 plexus and a branch from the musculocutaneous. It passes down 

 in front of the humeral artery, along the inner side of the radius to 

 the lower one-third of the same, where it bifurcates into the external 

 and internal plantar. 



It gives rise to the following branches: To the flexors of the 

 forearm and subcutaneous region of the forearm; the plantars 

 which give off the anterior, middle and posterior digitals at the 

 fetlock and supply the phalangeal region. 



Give the origin and the distribution of the posterior digital nerve. 



See answer to preceding question. Originates from the plantars 

 at the fetlock and is distributed to the podophyllous and osseous 

 structures of the foot. 



Of what is the lumbosacral plexus formed? 



Last two lumbar and first three sacral spinal nerves. 



What nerve supplies the following named muscles of the hind limb: 

 gastrocnemius, flexor pedis perforans and flexor pedis per- 

 foratus? 

 Branches of the great sciatic. 



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