. Comparative anatomy. Anatomy, Comparative. 562 COMPARATIVE ANATOMY Two such meninges surrounding brain and cord occur in Amphibia, a pia mater primitiva next to the brain and cord and, outside this, a dura mater. The wide space between dura mater and periosteum is bridged by connective tissue trabeculae. In mammals, three meninges are differentiated. Innermost is the pia mater, thin and highly vascular, from which connective tissue processes grow into brain and cord carry in blood vessels, and support the nervous CORPUS CALLOSUM TELENCEPHALON DURA MATER THIRD VENTRI OPTIC NERVE. SUBDURAL CAV
. Comparative anatomy. Anatomy, Comparative. 562 COMPARATIVE ANATOMY Two such meninges surrounding brain and cord occur in Amphibia, a pia mater primitiva next to the brain and cord and, outside this, a dura mater. The wide space between dura mater and periosteum is bridged by connective tissue trabeculae. In mammals, three meninges are differentiated. Innermost is the pia mater, thin and highly vascular, from which connective tissue processes grow into brain and cord carry in blood vessels, and support the nervous CORPUS CALLOSUM TELENCEPHALON DURA MATER THIRD VENTRI OPTIC NERVE. SUBDURAL CAVITr ARACHNOID; LATERAL VENTRICLE •CISTERNA SUPERIOR rEMTORIUM XREBELLI SUft+ INF. COLLICULI CEREBELLUM CHORIOID PLEXUS CISTERNA FOURTH VENTRICLE B PIA MATER DURA MATER ENTRAL CANAL SUBARACHNOIDAL SPACE ^^ SUBDURAL CAVITY FILUM TERMINALS Fig. 464.—Diagram showing the relations of the meninges to the central nervous system, as shown in median longitudinal section and in cross section. (Redrawn after Rasmussen's "Principal Nervous Pathways," The Macmillan Co.) tissue. Outside this is the arachnoid, which as its name suggests, is a delicate web-like tissue. Only its outer layer is organized into a mem- brane. Outermost of the three is the dura mater, thickest and toughest of all, and more or less closely attached to the periosteum which lines the cranium and the vertebral canal, so that this periosteum is sometimes reckoned as a part of the dura mater. Where the dura mater of mammals penetrates between the cerebral hemispheres it forms the falx cerebri. A similar fold of the dura mater grows between the hemispheres and the cerebellum to form a tentorium cerebelli. All three meninges develop from the loose mesenchyma which sur- rounds the embryonic neural Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origi
Size: 1367px × 1827px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
