Head movement, an important contributor to human cerebrospinal fluid circulation

Area of Science:

• Neuroscience
• Biomechanics
• Medical Imaging

Background:

• Suboccipital muscles connect to the spinal dura mater via myodural bridges (MDBs).
• MDBs are hypothesized to play a role in cerebrospinal fluid (CSF) circulation dynamics.
• The pumping function of suboccipital muscles on CSF flow requires further investigation.

Purpose of the Study:

• To investigate the effects of suboccipital muscle contractions on CSF flow.
• To determine if head movements influence CSF circulation.
• To explore the potential role of MDBs in mediating CSF flow changes.

Main Methods:

• Utilized cine phase-contrast MR imaging in 40 healthy volunteers.
• Acquired CSF flow data before and after a one-minute head rotation period.
• Analyzed CSF flow waveform parameters at the craniocervical junction.

Main Results:

• Significant increases in maximum and average CSF flow rates during ventricular diastole were observed post-rotation.
• Significant increases in CSF stroke volumes during diastole and the entire cardiac cycle were noted.
• Head movements were found to significantly promote CSF flow.

Conclusions:

• Head movements are a significant contributor to CSF dynamics.
• The suboccipital muscles, through MDBs, may actively influence CSF circulation.
• This study provides evidence for a mechanical link between suboccipital muscles and CSF flow.