HUMB1004 Study Guide - Final Guide: Superior Orbital Fissure, Dura Mater, Epidural Space
4 Aug 2018
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Aetiology : trauma to skull @ or around pterion causes injury to middle meningeal artery (eca branch) that runs deep to the pterion most common, fracture of skull is not a requirement. Fast bleed arterial (meningeal arteries are contained in the epidural space) Lens shaped, hyper dense clotted blood between squamosal suture and lambdodal suture. Aetiology : common in older people because brain starts to shrink (cortical atrophy), meaning that. Bridging veins (in subdural space) are stretched: stretched bridging veins more likely to rupture. I(cid:374)dire(cid:272)t trau(cid:373)a (cid:272)a(cid:374) (cid:272)ause the(cid:373) to rupture, does(cid:374)"t (cid:374)eed to (cid:271)e a direct hit to the head. Slow rate of bleeding venous, hours to months. Signs and symptoms : headache, key is progressive confusion, nausea, cranial nerve deficit problems swallowing, eyes, speech. Ct findinds : crescent shaped blood, not constricted to the sutures, can extend all the way from falx cerebri (natural anatomical boundary)
