surgical epidural hematom: 2 definition

Epidural bleeding, hematoma epidural, epidural hemorrhage is a pile of blood that appears, usually due to head trauma, in the layer between the duramater (brain out layer) and the bones of the deep skull (Anonymous, 2007).
In general, the brain membrane coated by the brain (meningens) that cover the entire surface of the brain and consists of 3 layers. Namely: duramater, arakhnoid, and piameter. Duramater is a membrane that consists of hardware and network fibrous rope attached closely with the Interna tabula or in part kranium. Duramater but not attached to the membrane arakhnoid below, so that there is the potential space subdural space (Krantz et al., 1997).
The conventional, said duramater consists of two layers, namely layers endosteal and meningeal layers. Endosteal layer is not close surface the periosteum in bone kranium. This layer does not continue through the foramen magnum to the prolonged duramater spinalis. Around the foramen kranii all, this continued with a layer of periosteum on the outside bone cranium. In the suture, layer is directly related to the ligament sutural. Also inherent in the most strong bones - the bones in the base kranii (Snell, 1997).
Meningeal layer is the duramater of fact. Fibrous membrane is dense and strong that envelop the brain to continue after the passing away as the duramater spinalis. This layer is also a wrapper for Tubular nerve kranialis while walking through the foramina kranii. Cranium outside, this layer integrates with nerve epineurium. Meningeal layer is formed to the septum in four, divide the cavity into cranium space - space is related with the free and
a part - the brain. Septa function is to prevent shifting the brain (Snell, 1997).
Duramater got many branches of the a. carotis Interna, maxillaris, pharyngeus ascendens, occipitalis, and vertebralis. From the clinical angle, the most important is a. meningea media, which rarely broken on head injury (Snell, 1997).
A. meningea media branch from a. maxillaris in the fossa infratemporalis. Log in to cranium cavity and walk to the front and in a lateral flow, on the top surface of the pars squamous ossis temporalis. Log in to cranium cavity through the foramen spinosum and is located between the meningeal layers and layers endosteal duramater. Branch anterior (frontal) groove or tunnel on the angulus anteroinferior ossis parietalis and in accordance with the way the brain gyrus precentralis below. Branch posterior (parietal) and the supply curve back pars posterior dura mater (Snell, 1997).
V. meningea located in the lining endosteal dura mater. V. meningea media following the branch - the branch a. meningea media and empty into the plexus venosus pterigoideus or sinus sphenoparietalis. Veins located lateral against artery (Snell, 1997).
Under the duramater that there is a second layer of thin and see-through layer called arakhnoid. Third layer is a PIA mater closely attached on the surface of the cortex serebri. Serebrospinal circulasi fluid between the membrane and arakhnoid PIA mater in space subarakhnoid (Krantz et al., 1997).