Membranes of the Brain consist Between the surfaces of the brain and the skull, there are three layers of membrane called the meanings, which completely cover the brain and spinal cord.
• These are Membranes Of The Brain.
1. Dura Matter
3. Pia Matter
Cerebrospinal Fluid (CSF)
• The subarachnoid space contains a fluid called cerebrospinal fluid (CSF), a clear, colorless fluid covering the entire surface of central nervous system.
• The total volume of CSF is 125-150 ml.
• Total production of CSF is about 400-500 ml/day (about 0.36ml/min).
• Areas in the cerebral cortex that are not involved in primary motor and sensory functions; rather they are involved in higher mental functions such as learning, remembering, thinking and speaking. Association areas in the Frontal Lobes are concerned with judging and planning.
• Damage may lead to intact memory but inability to plan out something. Personality may also be affected.
• Association areas of other lobes are related to other mental functions i.e. Temporal Lobe enables us to recognize faces; damage to this area causes inability to identify people (although facial features can be described), and gender and approximate age too.
• Association areas in the posterior lobes are involved in perception and memory. Damage leads to difficulty in perceiving speech.
• Continuation of the Medulla Oblongata.
• The spinal cord is about 45 cm long in men and 43 cm long in women and weighs about 35-40 grams.
• The vertebral column (back bone), encapsulating the spinal cord, is about 70 cm long comprising vertebra in the vertebral column.
• The spinal cord is much shorter than the vertebral column.
• Signals arising in the motor areas of the brain travel back down the cord and leave in the motor neurons.
• The spinal cord also acts as a minor coordinating center responsible for some simple reflexes like the withdrawal reflex Membranes Of The Brain.