Neuroimaging in concussion
Brian Sindelar, Julian E. Bailes in Sports-Related Concussion, 2017
Subdural hemorrhage is blood localized to the potential space between the leptomeninges and the dura as a result of shearing of bridging veins between the cortex and dura, (Figures 4.5 and 4.9). These bridging veins are relatively fixed at the adjacent sinus or dura and cannot move to the same extent as the brain does, especially during a rotational movement. These veins are ensheathed with arachnoid trabeculae as they traverse the subarachnoid space but not in the subdural space and that is why the hemorrhage preferentially localizes to this space.9 Other CT findings associated with mTBI include epidural hematomas as well as skull fractures, which is further discussed in Chapter 4.
Anatomy of the head and neck
Helen Whitwell, Christopher Milroy, Daniel du Plessis in Forensic Neuropathology, 2021
The arachnoid layer is subdivided into a further three layers. The arachnoid membrane covers the brain and serves to smooth out the underlying gyri and sulci. This is underlaid by an epithelial layer, and the cells and fibres of the arachnoid trabeculae that cross the subarachnoid space, giving it the appearance of a spider web. These trabeculae join the arachnoid to the underlying pia mater, the deepest brain layer. All nerves and vessels passing into or out from the brain must traverse the subarachnoid space, which is filled with CSF.
Modelling of intracranial behaviour on occiput impact in judo
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2019
Ryutaro Suzuki, Masaki Omiya, Hiroaki Hoshino, Takeshi Kamitani, Yusuke Miyazaki
The arachnoid trabeculae have spider-like intracranial structures. The arachnoid trabeculae are stretched over the entire subarachnoid space, and it may have great influence on the rotational behaviour of the brain. Therefore, we modelled it as a torsional spring and damper around one axis of rotation at the centre of gravity of the brain. The spring constant of the torsional spring was assumed to be 407 N mm/rad, based on reference (Jin et al. 2011). The damping coefficient of the damper element was set to 1.0 N mms/rad, which was calibrated from the cadaver experimental results.