10 HEAD AND NECK. 



Muscula'res, (2) superior and inferior to muscles of eye. 

 Carotri arto'ria aats'rforS at fissure of Sylvius forward in th* 

 great longitudinal fissure, anas, with its fellow by ante'rior 

 ComimSn'iCans \ curves round anterior border corpus callosum, 

 running back to its posterior part to anas, with posterior cere- 

 bral supplying olfactory and optic nerves, inferior surface 

 anterior lobes, 3d ventricle, anterior perforated space, corpus 

 callosum and inner surface of hemispheres. Cero'tri artc'ril 

 medial (largest branch,) obliquely outwards along fissure of 

 Sylvius, dividing into anterior branch to pia of anterior lobe, 

 median branch to small lobe at extremity of Sylvian fissurcj 

 fostefrior branch which supplies middle lobe; small branches 

 to corpus striatum through substantia perforata. Conmu'nicaia 

 pOS'.c'riorl from back part of artery backwards, anas, with pos- 

 terior cerebral of basilar. Ch:roi.'.e'a ante'lior : from back part of 

 artery back- and outwards, entering descending horn of lateral 

 ventricle; is distributed to hippocampus major, corpus fim- 

 briatum and choroid plexus. 



VEETEBEA'L'.S I (6brs.) ist and largest branch of subclavian. 

 Enters foramen in transverse process of 6th cervical vertebra 

 and ascends in these cervical foramina to the axis, then out- 

 wards, piercing occipito- ataloid ligament and dura, passing 

 through foramen magnum along in front of medulla, unites 

 with opposite fellow to form basilar. Spina'les latera'les, 

 enter spinal canal through the intervertebral foramina and 

 supply (anterior branches) the cord and membranes and (pos- 

 terior branches) posterior surface of vertebral bodies. Mus- 

 cula'rfsi deep muscles of neck, anas, with occipital and deep 

 cervical. Posterio'res meninge f ce t (2) to falx cerebelli. Spi- 

 na'lis anterior, given off near termination, unites with oppo- 

 site fellow, and descends on cord, anas, with spinal branches 

 through the intervertebral foramina down to sacrum. Supplies 

 pia of cord (being placed beneath it) and cord. Spina'lis pos- 

 te?rior t arises at side of medulla and passes down posterior sur- 

 face of cord, being reinforced similarly to the anterior spinal, 

 to sacrum. Inferior cerebella'ris> winds back over medulla, 

 to under surface of cerebellum, there dividing, the inferior 

 branches going backwards to notch between the two hemis- 

 pheres, the external branch supplying the inferior surface- 

 anas, with superior cerebellar; branches, also to choroid plexus, 

 4th ventricle. 



B ASILLA'BIS I (see above) from posterior to anterior borders 

 ofpons, there dividing into posterior cciebral. Transver'scCf 

 to ponSj internal auditory meatus, under surface cerebellum 



