Regarding cerebrospinal fluid, which of the following statements is NOT correct:
The ventricles are a set of communicating cavities within the brain that are responsible for the production, transport and removal of cerebrospinal fluid (CSF), which bathes the central nervous system.
In total there are four ventricles; right and left lateral ventricles, the third ventricle and the fourth ventricle. In cross sectional radiology, the midline cavities (third and fourth ventricles and the aqueduct) are symmetrical, but the lateral ventricles (the cavities of the hemispheres) are not.
The lateral ventricles are C-shaped cavities located within their respective hemispheres of the cerebrum. They are divided into a body, an anterior horn (projecting into the frontal lobe), an inferior horn (projecting into the temporal lobe) and a posterior horn (projecting into the occipital lobe). The lateral ventricles are connected to the third ventricle by the interventricular foramen (of Monro).
The third ventricle is a slit-like space in the sagittal plane, situated between the right and left thalamus and superior to the hypothalamus. The third ventricle is connected to the fourth ventricle by the cerebral aqueduct.
The fourth ventricle lies within the brainstem, at the junction between the pons and the medulla oblongata.
Ventricular System of the Brain. (Image by BruceBlaus (Own work) [CC BY 3.0 , via Wikimedia Commons)
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Biochemistry | Normal Value |
---|---|
Sodium | 135 – 145 mmol/l |
Potassium | 3.0 – 4.5 mmol/l |
Urea | 2.5 – 7.5 mmol/l |
Glucose | 3.5 – 5.0 mmol/l |
Creatinine | 35 – 135 μmol/l |
Alanine Aminotransferase (ALT) | 5 – 35 U/l |
Gamma-glutamyl Transferase (GGT) | < 65 U/l |
Alkaline Phosphatase (ALP) | 30 – 135 U/l |
Aspartate Aminotransferase (AST) | < 40 U/l |
Total Protein | 60 – 80 g/l |
Albumin | 35 – 50 g/l |
Globulin | 2.4 – 3.5 g/dl |
Amylase | < 70 U/l |
Total Bilirubin | 3 – 17 μmol/l |
Calcium | 2.1 – 2.5 mmol/l |
Chloride | 95 – 105 mmol/l |
Phosphate | 0.8 – 1.4 mmol/l |
Haematology | Normal Value |
---|---|
Haemoglobin | 11.5 – 16.6 g/dl |
White Blood Cells | 4.0 – 11.0 x 109/l |
Platelets | 150 – 450 x 109/l |
MCV | 80 – 96 fl |
MCHC | 32 – 36 g/dl |
Neutrophils | 2.0 – 7.5 x 109/l |
Lymphocytes | 1.5 – 4.0 x 109/l |
Monocytes | 0.3 – 1.0 x 109/l |
Eosinophils | 0.1 – 0.5 x 109/l |
Basophils | < 0.2 x 109/l |
Reticulocytes | < 2% |
Haematocrit | 0.35 – 0.49 |
Red Cell Distribution Width | 11 – 15% |
Blood Gases | Normal Value |
---|---|
pH | 7.35 – 7.45 |
pO2 | 11 – 14 kPa |
pCO2 | 4.5 – 6.0 kPa |
Base Excess | -2 – +2 mmol/l |
Bicarbonate | 24 – 30 mmol/l |
Lactate | < 2 mmol/l |