Define pia mater.

Luke Marks is a 40-year-old male who was brought into ED by ambulance after he came off his motorcycle at 40km/hr after hitting a pothole in the road. The incident was called in by a bystander, an off-duty lifeguard, who helped to stabilise his c-spine by supporting his head (in a badly scratched helmet) and spoke to him until paramedics arrived.  Handover from paramedics included: GCS 15, PERRLA, nil evidence of head injury despite a head strike, but Luke was unable to move his arms and legs and stated he had nil sensation in his legs and the sensation in his hands felt strange. The paramedics safely removed his helmet and safely secured a hard collar around his neck before transporting him to hospital. Luke reported pain of 8/10 in his cervical spine but nowhere else. His vital signs were as follows: RR 22, SpO2 98% RA, HR 59bpm, BP 125/63 mmHg, Temp 35.7 degrees.  Paramedics administered 8mg IV ondansetron, 5mg s/c morphine and 250ml of NaCl (0.99%) en route. Luke has no significant…

Identify the structures labeled B and C

Hide Feedback Drag and Drop 1 Subdural space 2 Third ventricle 3 Fourth ventricle 4 Lateral ventricle 5 Foramen of Magendie 6 Pia mater 7 Corpus callosum 8 Straight sinus 9 Arachnoid villa 10 Foramen of Monroe. 11 Dura mater 12 Skull 13 Subarachnoid space 14 Cerebral aqueduct 15 Choroid plexus 16 Arachnoid 17 Cerebellum 18 Cerebrum