Sulcus cingnli 



Arteries of the Head. 



Corpus callosum 



401 



Fissura parietooccipitalis 



Cuneus 



A. cerebri anterior 



N. opticus 



A. communicans anterior 



A. carotis interna 



Fissura calcarina 



A. cerebri posterior 

 A. communicans posterior 



446. Arteries of the medial surface of the right 



cerebral hemisphere. 



5. A. chorioidea ((). T. anterior choriuid artery) (see Figs. 444 and 445), delicate, goes 

 between the tractus opticus and the gyrus hippocampi backward and lateralward to the cornu 

 inferius of the lateral ventricle and breaks up in the plexus chorioideus ventriculi lateralis 

 into branches ; it sends besides small branches to the surrounding parts. 



6. A. cerebri media (middle cerebral artery) (see Figs. 444, 445, 447 and 448) runs 

 lateralward to the fossa cei"ebri lateralis [Sylvii] and in this to the lateral surface of the 

 frontal, parietal and temporal lobe; it supplies the island and the gyri frontalis inferior, cen- 

 trales anterior et posterior, the lobuli parietales superior et anterior, the gyri supramarginalis, 

 angularis and temporalis superior. 



A. SUbclavia (see Figs. 427, 434, 441 and 449) arises on the right side from the a. 

 anonyma, on the left side dii-ectly from the arch of the aorta (see p. 389) ; the riglit is therefore 

 shorter than the left, which ascends at first behind the v. anonyma sinistra, on the left side 

 of the trachea. The artery runs on each side lateralward in a curve over the pleural cupula 

 and over the first rib, being convex upward. In front it is bounded at first by the v. sub- 

 clavia, then by the m. scalenus anterior, behind by the m. scalenus medius and comes to lie 

 in the triangular space between these two muscles in the sulcus subclaviae of the first rib. 

 From there on it goes, in the depth of the fossa supraclavicularis major, downward and lateral- 

 ward to the axilla, behind and below the middle of the clavicle; it is covered by lymph glands 

 and adipose tissue and is bounded in front by the v. subclavia and the a. transversa scapulae, 

 behind and above by the plexus brachialis. From the lower margin of the m. subdavius on, 

 its continiiation is called the a. axQlaris. Arising from it medianward from the m. scalenus 

 anterior are the following branches : a. vertebralis, a. mammaria interna and the truncus thjreo- 

 cervicalis, which again divides in a variable manner into the a. thyreoidea inferior, a. cervi- 

 calis ascendens , a. cervicalis superficialis and a. transversa scapulae ; beliind the m. scalenus 

 anterior the truncus costocervicalis is given off, which divides into the a. intercostalis 

 suprema and the a. cervicalis profunda: in the space between the mm. scaleni the a. trans- 

 versa colli arises. 



