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Frontally mediated control processes contribute to source memory retrieval.

Abstract

Remembering is a cognitively demanding task that requires the strategic selection of information from memory. In this issue of Neuron, Dobbins et al. present functional MRI (fMRI) data that shed insight into the specific, dissociated contributions of frontal regions to remembering.

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Randy L Buckner. 2002-08-29. Frontally mediated control processes contribute to source memory retrieval.. https://doi.org/10.1016/s0896-6273(02)00866-8

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We report the case of a 56-year-old man with a frontal meningioma who underwent scheduled surgery under balanced general anesthesia without complications and was then transferred to the intensive care postoperative recovery unit for observation. On the day of admission he developed polyuria and a decrease in central venous pressure. Plasma sodium and osmolarity were in the normal ranges but urine analysis showed hyponatremia and hypo-osmolarity, suggesting cerebral salt wasting syndrome. Physiological saline solution was infused to maintain osmolarity and plasma concentrations of sodium within normal ranges. Diuresis peaked on the sixth day after surgery at 17,600 mL in 24 hours and decreased gradually to normal on the eleventh day after admission. Elevated plasma concentrations of atrial natriuretic peptides confirmed the diagnosis. Correct management is essential when neurosurgery patients develop altered plasma and urinary sodium concentrations and osmolarity. Differential diagnosis involves considering diabetes insipidus, inappropriate secretion of antidiuretic hormone and salt wasting syndrome. Transfer to an intensive care postoperative recovery unit and early treatment are important for lowering the risk of complications and death.

Frontal Lobe↗

The one-piece orbitozygomatic approach: the MacCarty burr hole and the inferior orbital fissure as keys to technique and application.

OBJECTIVE: Use of the MacCarty keyhole burr hole and the inferior orbital fissure provides simplicity and safety to perform the one-piece frontotemporal orbitozygomatic (FTOZ1) approach. METHODS: We performed the FTOZ1 approach with its three subtypes (i.e., total, temporal, and frontal) in cadaveric head specimens in the Goodyear Laboratory and subsequently in surgical cases. RESULTS: The orbitozygomatic osteotomy, when added to a frontotemporal craniotomy, comprises the frontotemporal orbitozygomatic (FTOZ) approach, provides an expanded exposure to the anterior and middle cranial fossae, and enables the surgeon to create a window to the posterior cranial fossa. The MacCarty burr hole is used to facilitate orbital cuts, and the anterolateral portion of the inferior orbital fissure connects the orbital cuts to the zygomatic cuts. This allows the FTOZ1 craniotomy flap to be "out-fractured" with ease. The three types of FTOZ1 approach, i.e., the total, the temporal, and the frontal, are described step by step. CONCLUSIONS: Understanding the MacCarty keyhole burr hole and the microsurgical anatomy of the inferior orbital fissure is essential to performing the FTOZ1 approach. The three types of FTOZ1 approach enable the surgeon to tailor the approach according to the surgical exposure needed for each lesion.

Frontal Lobe↗