298 



ANATOMY IN A NUTSHELL. 



face and it gives off in the canal orbital branches to the orbit and anterior dental 

 branches to the anterior dental canals, to the antrum and teeth. (3.) Descend- 

 ing palatine which d( Mends in the posterior palatine canal and runs forward 

 in a groove on the hard palate then up through the foramen of Stenson. (4) 

 Vidian branch passes backward through the vidian canal to the pharynx and 

 Eustachian tube, sending a branch to thetypanum. (5) Pteh * go-palatine which 

 runs through the pterygo-palatine canal to the pharynx and Eustachian tube. 

 (6) Spheno-palatine which runs through the spheno-palatine foramen to the 

 Dose. It divides into external branches which pass to the lateral walls of the 

 nose and the nasi -palatine branch which descends on the septum to the fora- 

 men of Stenson. 



PLATE CXXX. 



DECUSSATING FIBROUS 

 TISSUE OF VALVE 



FREE EDGE OF VALVE 



CORPUS ARANTII 



Semilunar Valves. (Aortic.) 



LESSON LXXXV. 



The First Three Cervical Nerves. 



The anterior branch of the First Spinal nerve (suboccipital) leaves the spinal 

 canal in the sinus atlantis beneath the vertebral artery, to the inner side of the 

 Rectus capitis lateralis, and to the outer side of the upper articular process of 

 the atlas. From this point it descends to the front of the transverse process of 

 the atlas and mutes with the upper branch of the second nerve thus making 

 with it the first, loop of the Cervical plexus. (Plate (XIII). 



This first nerve receives a filament, from the sympathetic as it crosses the 

 foramen in the transverse process of the atlas. Prom the loop between the 

 lii-l and second libers pass to the twelfth cranial nerve, which unite with fibers 

 from it and descend to form the descendens hypoglossi. Other fibers from this 

 loop join the tenth cranial nerve and the sympathetic, also pass to the Rectus 

 capitis lateral)- and the Rectus capitus anticus major and minor. The anterior 



