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Med Neuro Lect4
Med Neuro Lect4 Cerebral Anatomy - Meninges
| Question | Answer |
|---|---|
| What structure serves as the Periosteum? | Outer Dural layer |
| Name the Meningeal layers from outer to inner | 1.Dura. 2.Arachnoid. 3.Pia |
| Where on the skull is most vulnerable to cause a epidural hematoma? | Squamous portion of the temporal bone b/c it is so thin. **It would lead to damage of the middle meningeal artery. |
| What two structures does the central sulcus in the brain divid? what does each control? | 1.Pre-central gyrus: Motor cortex. 2.Post-central gyrus: Sensory cortex. |
| Name the Hemorrhage: B/w Cranium & outer dura? | Epidural |
| Name the Hemorrhage: B/w Inner Dura & Arachnoid? | Subdural |
| Name the Hemorrhage: B/w the Arachnoid & Pia | Subarachnoid (usually result from aneurysm). |
| What will you find Medially and Deep in each cerebral hemisphere? | Deep Nuclei of the Cerebrum. |
| What Lobe lies in the Anterior Cranial Fossa? | Frontal Lobe |
| What Lobe lies in the Middle Cranial Fossa? | Temporal Lobe |
| What to lobes of the brain are particularly susceptible to damage during an abrupt stop? | 1.Frontal (contusion from frontal bone). 2.Temporal (contusion from petrous part of temporal bone). **Will affect memory and functioning. |
| What CNS structure passes through the hole in the tentorium cerebelli? | Mid Brain. |
| The Falx cerebri (created by the joining of two inner dural layers and the housing of superior sagital sinus) attaches to what structure anteriorly? | Crista Galli (Ethmoid bone). |
| What structure passes through the hole in the falx cerebri? | Corpus Callosum (allows communication from R and L hemisphere, heavily myelinated). |
| What occurs during a Subfalcine hernia? | One hemisphere of the brain is pushed through the hole underneath Falx cerebri. **Will see emotional symptoms prolonging. |
| What 2 compartments are seperated by the tentorium cerebelli? What symptoms will be seen in diagnosing each? | 1.Supratentorial (above): will see cognitive & memory loss, vision problems. 2.Infratentorial (below): will see ataxia, motor funciton loss, CN problems. |
| What layers create the triangle spaces or Sinuses? | When 2 inner layers of the dura peel away from the outer layer and join eachother. |
| What portion of the arachnoid layer is lining the subdural space? | Membraneous Arachnoid layer. |
| What portion of the arachnoid layer is in contact with the Pial layer? | Trabecular Arachnoid layer. |
| What is responisible for draining the CSF from the subarachnoid space into the dural sinuses? What layer are they extensions of? | Arachnoid Granulations which are a protrusion of the membranous Arachnoid layer into the inner dural linning. |
| How do the Arachnoid Granulations work? | They have one way valves and rely on the pressure gradient to drive fluid from the subarachnoid space into the dural sinuses. |
| Cisterna Magna (Inferior Cerebellar Cistern) | Space created b/w the 2 lobes of the cerebellum by the arachnoid layer comming off the cerebellum to exit the foramen magnum. |
| Pentangular Cistern | (5 Point star) is the arachnoid layer that comes together on the inferior side of the brain around the infundibulum. **Subarachnoid Hemorrhage will pool here and create a 5 point white star on the CT scan. |
Created by:
WeeG
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