DISSECTION OF THE HEAD AND NECK 



L'U'5 



(a) Basilar plexus (plexus basilaris) (0. T. basilar sinus) 



(b) Diploic veins (venae diploicae). (See Spalteholz, Fig. 485 ) 



(ba) Frontal diploic vein (V. diploica frontalis). 



(bb) Anterior temporal diploic vein ( V. diploica temporalis an- 



terior). 



(be) Posterior temporal diploic vein (V. diploica temporalis pos- 

 terior), 

 (bd) Occipital diploic vein (V. diploica occipitalis). 



(c) Emissary veins. 



(ca) Parietal emissary (emissarium parietale). 



(cb) Mastoid emissary (emissarium mastoideum). 



(cc) Condyloid emissary (emissarium condyloideum) . 



(cd) Occipital emissary (emissarium occipitale). 



Entrance of Arteries into the Cavity of the Skull. 



The student should next examine the exact position and rela- 

 tions of the various arteries entering the cavum cranii. 



(a) Internal carotid artery (A. carotis interna). 



(b) Vertebral artery (.4. vertebralis). 



(c) Meningeal arteries (Aa. meningeae). (See Spalteholz, Fig. 447.) 



(ca) Middle meningeal artery (A. meningea media), from the A. 



niaxillaris interna. 



(cb) Anterior meningeal artery (A. meningea anterior), from the 



A. ethmoidalis anterior of the A. ophthalrnica. 



(cc) Accessory meningeal branch (ramus meningeus accessorius) 



(0. T. small meningeal artery), usually from the A. menin- 

 gea media. It will be studied later. 



(cd) Posterior meningeal artery (A. meningea posterior), from the 



A. pharyngea ascendens. 



(ce) Meningeal branch (ramus meningeus), from the A. occipitalis. 



It is inconstant. 



(cf) Meningeal branch (ramus meningeus), from the A. verte- 



bralis. 



Hypophysis. 



Cut through the diaphragma sellae and extricate the hypo- 

 physis (O. T. pituitary body) from the sella turcica. Observe its 

 shape and consistency and its division into an anterior lobe 

 (lobus anterior) and a posterior lobe (lobus posterior). Make 

 a sagittal section through it and observe the relations of the 

 two lobes to each other. With which is the infundibulum con- 

 tinuous? Read up on the embryological origin of these two 

 lobes. The cavity of the skull should now be packed with tow 

 soaked in a solution of carbolic acid or in alcohol. Replace the 

 skul lea]) and stitch the scalp flaps in position over it. This is 

 very important for the further dissection. 



