EL HUSSEINYS ESSENTIALS OF NEUROLOGY BY MOHAMED EL HUSSEINYS PDF
EL HUSSEINYS ESSENTIALS OF NEUROLOGY BY MOHAMED EL HUSSEINYS PDF lies in the vertebral canal and ends at the lower border of 1st lumbar vertebra ( the space between L1 & L2 ) It is formed of gray matter ( containing the cell bodies of the neurons ) surrounded by white matter ( containing the axons of the neurons that form the ascending and descending nerve fibers arranged into tracts or fasciculi ) In a transverse sec on the gray maer resembles the leer H or buerfly shape ( 2 anterior and 2 posterior horns ) There are 31 pairs of spinal nerves arise segmentally from the spinal cord ( 8 cervical , 12 thoracic , 5 lumbar , 5 sacral , 1 coccygeal ) Each spinal nerve is formed from the combination of nerve fibers from its dorsal and ventral roots ( mixed ) , the dorsal root is the afferent sensory root and carries sensory information to the brain while the ventral root is the efferent motor root and carries motor information from the brain .
EL HUSSEINYS ESSENTIALS OF NEUROLOGY BY MOHAMED EL HUSSEINYS PDF are 2 regions where the spinal cord enlarges : 1. Cervical enlargement ( C5 through T1 ) which give rise to rootlets that form the brachial plexus , which innervate the upper limb . 2. Lumbosacral enlargement ( L1 through S2 ) which give rise to the rootlets that form the lumbosacral plexus which innervate the lower limb .