90 - LEPUS. 



174. Neck. Open the abdominal cavity of another rabbit and remove the alimentary 

 canal, taking care not to injure the genital organs. Raise the sternum in order to stretch 

 the diaphragm and notice the expanded lungs seen through it. Then make a cut in the 

 diaphragm and observe the collapse of the lung on that side. Fix the rabbit on its back 

 by nails through feet and ears. Skin the ventral surface of the neck, being careful not to 

 cut the external jugular veins. Make a median incision, commencing between the rami 

 of the mandible and extending backwards. 



NOTE. Sub-maxillary glands ; larynx; trachea; oesophagus; internal jugular veins; 

 thyroid gland ; carotid artery dividing into internal and external branches ; posterior 

 cornua of hyoid ; hypoglossal nerve. With your finger stretch the connective tissue beside 

 the right carotid artery to see the following nerves : vagus, with ganglion ; depressor 

 and superior laryngeal branches of vagus ; ramus descendens of hypoglossal ; cervical 

 sympathetic, with ganglion ; inferior (recurrent) branch of vagus lying next the trachea, 

 looping round the subclavian artery at its commencement. Make a drawing showing 

 the above structures. 



Before leaving make a small hole in the roof of the skull, in order to allow the formalin 

 to reach the brain, taking care not to injure the latter. 



