Factors influencing exit of substances from cerebrospinal fluid into deep cervical lymph of the rabbit

The Journal of Physiology
M W Bradbury, R J Westrop

Abstract

Experiments have been made to determine the main route by which radio-iodinated albumin reaches deep cervical lymph from cerebrospinal fluid (c.s.f.) in the anaesthetized rabbit. Other factors, influencing drainage through this pathway, have been investigated. After single injection of [125I]albumin into a lateral ventricle of control rabbits, a mean of 14.8% of the radioactivity lost from brain-c.s.f. was recovered during 6 hr in the lymph of the cannulated jugular trunk of one side. Injection of kaolin into the olfactory fossa or sealing of the cribriform plate with cyanoacrylate glue reduced the recovery of [125I]albumin to 3.3% and 1.9% respectively at 2-3 weeks after the procedure designed to block the cribriform plate. This confirms the traditional view that the major connexions between c.s.f. and deep cervical lymph is via prolongations of subarachnoid space around the olfactory nerves, leading into the interstitial spaces of the nasal submucosa. The dense lymphatic plexus in this tissue is known to drain into the retropharyngeal (deep cervical) lymph nodes. Constant infusion of artificial c.s.f. into a lateral ventricle at 10 microliters/min or 30 microliters/min, in order to approximately double or quadruple flow throu...Continue Reading

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