Dural Septa and Intracranial Hemorrhage Facts Checked
“Dural Septa Dural septa are folds of the meningeal layer of the dura mater that help stabilize and separate parts of the brain. Falx Cerebri A sickle-shaped vertical fold within the longitudinal fissure. Separates the right and left cerebral hemispheres. Contains: Superior sagittal sinus along its upper attached edge Inferior sagittal sinus along its lower free edge Tentorium Cerebelli A horizontal fold of dura that separates: The occipital lobes of the cerebrum above The cerebellum below Forms a “tent” over the cerebellum. Contains the transverse sinuses along its posterior attachment. Falx Cerebelli A small vertical dural fold located below the tentorium cerebelli. Lies between the two cerebellar hemispheres in the posterior cranial fossa. Contains the occipital sinus. It does not contain the inferior sagittal sinus. Diaphragma Sellae A small circular fold of dura over the pituitary gland. Covers the sella turcica with a small opening for the pituitary stalk. Intracranial Hemorrhages Epidural Hematoma Location Blood collects in the epidural space between the skull and dura mater. Mechanism Usually caused by a temporal bone fracture near the pterion. The fracture tears the middle meningeal artery. Since this is an artery, bleeding is rapid. Symptoms Headache Nausea and vomiting Focal neurological deficits Brief loss of consciousness followed by a lucid interval Then rapid neurological deterioration May progress to tentorial herniation and compression of cranial nerve III Cranial Nerve III Compression Dilated pupil Eye deviates “down and out” Ptosis (drooping eyelid) CT Appearance Biconvex or lens-shaped hematoma Does not cross suture lines Management Emergency surgical evacuation by burr hole or craniotomy Lower intracranial pressure (ICP) with: Mannitol Elevation of the head Temporary hyperventilation if needed Subdural Hematoma Location Blood collects in the subdural space between the dura and arachnoid mater. Mechanism Caused by tearing of bridging veins. Usually due to rapid acceleration-deceleration injury. More common in older adults because brain atrophy stretches the veins. Symptoms Headache Vomiting Confusion Altered consciousness Symptoms may develop slowly A lucid interval is usually absent CT Appearance Crescent-shaped hematoma Can cross suture lines Cannot cross the midline because of the falx cerebri Management Observation if small Surgical drainage if there is significant mass effect or more than 5 mm midline shift Subarachnoid Hemorrhage Location Blood enters the subarachnoid space between the arachnoid and pia mater. Mechanism Most commonly due to rupture of a berry (saccular) aneurysm. Risk factors include hypertension and connective tissue disorders. Symptoms Sudden severe “thunderclap headache” Often described as the “worst headache of my life” Nausea and vomiting Neck stiffness Photophobia Possible retinal hemorrhages (Terson syndrome) Diagnosis First test: noncontrast CT scan If CT is negative but suspicion remains high, perform lumbar puncture Lumbar puncture may show xanthochromia (yellow CSF from blood breakdown) Cerebral angiography is then used to locate the aneurysm Management Blood pressure control Bed rest Stool softeners to avoid increased ICP Definitive treatment: Endovascular coiling Surgical clipping Intracerebral Hemorrhage Location Bleeding directly into the brain parenchyma. Mechanism Most commonly caused by chronic hypertension. Other causes include: Arteriovenous malformations (AVMs) Cerebral amyloid angiopathy Symptoms Headache Nausea and vomiting Weakness on one side of the body Hemiparesis or hemiplegia Decreased consciousness Diagnosis CT shows an intraparenchymal bleed. Lumbar puncture is contraindicated. Management Control intracranial pressure with mannitol Treat blood pressure Surgical evacuation if there is severe mass effect Comparison of Intracranial Hemorrhages Feature Epidural Hematoma Subdural Hematoma Subarachnoid Hemorrhage Intracerebral Hemorrhage Location Between skull and dura Between dura and arachnoid Between arachnoid and pia Within brain tissue Vessel Involved Middle meningeal artery Bridging veins Ruptured berry aneurysm Small intracerebral vessels Common Cause Temporal bone fracture Acceleration-deceleration trauma Hypertension, aneurysm Chronic hypertension Key Symptom Lucid interval Slow confusion, no lucid interval Thunderclap headache Hemiparesis/hemiplegia CT Appearance Lens-shaped, does not cross sutures Crescent-shaped, crosses sutures Blood in sulci/cisterns Intraparenchymal bleed Lumbar Puncture Not used Not used Used if CT negative Contraindicated Severe Treatment Surgical evacuation Surgical drainage Coiling or clipping ICP control, possible surgery”
Summary
The descriptions of the dural septa—including the falx cerebri, tentorium cerebelli, falx cerebelli, and diaphragma sellae—match current anatomical references. The characteristics, mechanisms, clinical features, imaging findings, and management of epidural, subdural, subarachnoid, and intracerebral hemorrhages are consistent with contemporary medical literature. No significant errors are identified.
Sources 59 searched
- Neuroanatomy, Tentorium Cerebelli - StatPearls - NCBI Bookshelf
The falx cerebri (a vertical fold of dura and the largest of the four dural septa) attaches to the superior surface of the tentorium cerebelli along the midline (the straight sinus is contained within this attachment), and a further vertical fold of dura; the falx cerebelli is attached to its ...
- Anatomy, Head and Neck, Dura Mater - StatPearls - NCBI Bookshelf
The dura mater is composed of two layers: the periosteal/endosteal layer and the meningeal layer. The dural venous sinuses are between these two layers. The dura folds to form septa that create the falx cerebri, tentorium cerebelli, falx cerebelli, and diaphragma sellae.
- Neuroanatomy, Cranial Meninges - StatPearls - NCBI Bookshelf
The periosteal layer consists of ... layers descend into the cranial cavity to form the septa that compartmentalize the brain. The two main dural reflections are the falx cerebri and the tentorium cerebelli....
- The lucid interval associated with epidural bleeding: evolving understanding - PubMed
The courses of the patients were then tabulated, and the correlation between different clinical and operative findings was thereby determined. Our understanding of a lucid interval began in the early 18th century with the work of Henri-François Le Dran and Percival Pott in London. They did not, however, demonstrate an interval without symptoms between trauma and deterioration in patients with epidural hematomas (EDHs).
- Lucid Interval - an overview | ScienceDirect Topics
Subsequent investigation reveals severe brain swelling and in a few cases there may be a small unilateral subdural hematoma with disproportionately severe ipsilateral brain swelling. ... Headache, nausea, vomiting, seizures, focal neurological deficits (e.g., field cuts, aphasia, weakness) ... Patients with severe DAI are rendered unconscious at the time of impact. A lucid interval is not a feature, and these individuals either remain in a permanent vegetative state or are severely disabled. Milder cases may present after a brief period of unconsciousness, only later to experience difficulty concentrating, memory impairment, headache, depression, and abnormal neuropsychological testing (Table 25-7).68
- Subdural and epidural hematoma occurrence in relation to the head impact site: An autopsy study - ScienceDirect
Epidural hematomas were found only under the primary impact site, whereas subdural hematomas were coup, contrecoup, or bilateral. An epidural hematoma was found to be almost 5 times more frequent in cases in which a subdural hematoma was present.
- Traumatic Epidural and Subdural Hematoma: Epidemiology, Outcome, and Dating - PMC
Posterior fossa subdural hematoma (PFSDH) has a more severe prognosis, as the posterior fossa involves delicate structures for vital functions, and these have their own dedicated studies [52,53]. Similar considerations were made for posterior fossa epidural hematomas (PFEDH), which are associated ...
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