LYMPH•LOGISCH · Understanding your body
Glymphatics: Understanding the brain’s fluid pathways.
New research into the brain’s fluid pathways raises important hopes and questions. What does glymphatics mean, and what can it tell us about manual lymphatic drainage of the head and neck?
What does glymphatics mean?
The glymphatic concept describes exchange between cerebrospinal fluid, or CSF, and tissue fluid in the brain along pathways near blood vessels. Glial cells, the supporting cells of the nervous system, have a role in this process. The foundational experimental study by Iliff and colleagues was published in 2012 and involved mice. Details of fluid movement and their importance in humans remain under investigation. [1]
How are the brain and neck lymphatics connected?
Glymphatic pathways are not the same structures as lymphatic vessels. The membranes around the brain contain meningeal lymphatic vessels connected to further drainage pathways outside the skull and to cervical lymph nodes. Louveau and colleagues described relevant vessels and functions in animal research in 2015. These are connected but anatomically distinct systems. [2], [3]
What can imaging show?
In a 2025 review, Agarwal, Klein and O’Gorman Tuura describe how MRI methods investigate fluid spaces and transport. Meningeal lymphatic vessels can be visualised in humans. Visible structures or indirect measurements do not by themselves establish that a particular treatment improves clearance. Connections between fluid pathways remain under investigation. The review focuses particularly on the developing brain and is not an MLD efficacy study. [7]
What does neck stimulation research show?
Jin and colleagues published a mouse study in Nature in 2025. A force-controlled mechanical device stimulated superficial cervical lymphatics through intact skin. Measured CSF outflow increased, including in older animals. This is an important mechanistic finding. It does not show that routine manual treatment has the same effect in people or that it treats disease. [3]
Is there a connection with Alzheimer’s research?
Yes. Researchers are investigating whether altered drainage contributes to protein accumulation and could become a treatment target. In 2025, Bartlett and colleagues reported head and neck MLD in mice with Alzheimer-like pathology. Behavioural measures and some disease markers improved. The PubMed record reviewed lists this work as a preprint, meaning it has not yet been peer reviewed by a journal. It does not establish efficacy in humans. [4]
What about reports of surgery?
Li and colleagues described an Alzheimer’s patient in 2024 whose test and imaging results improved five weeks after surgical diversion of cervical lymphatic pathways. This involved surgically changing drainage routes. The single case had no comparison group and was not a study of MLD. Such observations support further investigation but establish neither a cure nor a comparable benefit from massage. [5]
A 2025 editorial by Erickson, Bernas and Witte also calls for a well-designed clinical trial of MLD in Alzheimer’s disease. A proposal for research is valuable, but is not itself a treatment result. [6]
What does this mean for treatment today?
This is relevant, developing research. It does not currently justify claims that cosmetic head and neck MLD detoxifies the brain, prevents Alzheimer’s disease or improves memory. Enjoying a treatment and demonstrating changes in brain drainage or disease progression are different outcomes. Memory concerns warrant medical assessment. [3], [4], [5], [6]
Stay curious and evaluate carefully.
This research interests me because it asks new questions about the lymphatic system. I want to explain developments clearly and remain open to new findings. At the same time, you should be able to distinguish what has been studied from hopes that still need to be tested.
Studies and references
- Iliff et al. (2012)
Foundational mouse study of paravascular fluid exchange and solute clearance. DOI: 10.1126/scitranslmed.3003748.
- Louveau et al. (2015)
Experimental study of meningeal lymphatic vessels. DOI: 10.1038/nature14432.
- Jin et al. (2025)
Nature 643:755–767. Mechanical stimulation of superficial cervical lymphatics in mice; not a clinical MLD trial.
- Bartlett et al. (2025), Preprint
Head and neck MLD in the 5x-FAD mouse model. DOI: 10.1101/2025.08.08.669361. Listed as not journal peer reviewed in the record checked.
- Li et al. (2024)
Single-case report of cervical lymphatic shunting in Alzheimer’s disease, five-week follow-up. Surgery, not MLD.
- Erickson, Bernas & Witte (2025)
Editorial in Lymphology 58(2):43–45 calling for a clinical trial; not an efficacy study.
- Agarwal, Klein & O’Gorman Tuura (2025)
MR Imaging of Neurofluids in the Developing Brain. Neuroimaging Clin N Am 35(2):287–302. Imaging review, not an MLD intervention trial. DOI: 10.1016/j.nic.2024.12.005.
Research checked: 22 October 2026. Selected relevant sources, not a systematic review. This information does not replace individual assessment.