. Cunningham's Text-book of anatomy. Anatomy. THE CKANIUM. 1363 fourth ventricle may be opened up by making a somewhat larger trephine opening and separating the posterior extremities of the tonsillar lobes of the cerebellum. To expose the lateral hemisphere of the cerebellum, trephine over the centre of a line drawn from the tip of the mastoid process to the external occipital protuberance. To expose both lobes of the cerebellum a flap is turned downwards by carrying a curved incision between the bases of the mastoid processes, the centre of the incision reaching upwards to a little above the
. Cunningham's Text-book of anatomy. Anatomy. THE CKANIUM. 1363 fourth ventricle may be opened up by making a somewhat larger trephine opening and separating the posterior extremities of the tonsillar lobes of the cerebellum. To expose the lateral hemisphere of the cerebellum, trephine over the centre of a line drawn from the tip of the mastoid process to the external occipital protuberance. To expose both lobes of the cerebellum a flap is turned downwards by carrying a curved incision between the bases of the mastoid processes, the centre of the incision reaching upwards to a little above the inion. The occipital arteries are. Fig. 1069.— Guiding lines (Chiene's), deep black G. Glabella. 0. External occipital protuberance (inion). M. Mid-point between G and 0. T. Mid-point between M and 0. Mid-point between T and 0. Zygomatic process of frontal. Root of zygoma (pre-auricular point). Mid-point of EP. Mid-point of PS. Cranio-Cerebral Topography. sutures, fine black ; meningeal arteries, red ; sulci, blue. C. Mid-point of AB. MA is divided into thirds at K and L. CD is drawn parallel to AM. Z. Post-auricular point. VW. Guide to anterior limit of transverse sinus. Y. Tympanic antrum. *1. Site at which subarachnoid space may be opened. *2. Site for draining lateral ventricle (Kocher). *3. Site for draining lateral ventricle (Keen). divided, but the anterior extremities of the incision should, if possible, be kept behind the mastoid emissary veins. As the flap contains the suboccipital muscles the bone itself may be removed. If more room is required, the opening in the bone may reach above the level of the transverse sinuses without wounding them as they can be displaced along with the dura. The occipital sinus is divided between two ligatures. After dividing the dura the lateral lobe of the cerebellum may be displaced towards the median plane so as to enable the finger to be passed. Please note that these images are extracted from scanned page images that may have bee
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
