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CENTRAL NERVOUS SYSTEM

CENTRAL NERVOUS SYSTEM. CNS. Capable of evaluating incoming info and formulating responses to changes that threaten our homeostatic balance 2 protective coverings for the brain and spinal cord Outer covering: bone Inner covering: membrane called meninges. 3 layers that make up the meninges

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CENTRAL NERVOUS SYSTEM

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  1. CENTRAL NERVOUS SYSTEM

  2. CNS • Capable of evaluating incoming info and formulating responses to changes that threaten our homeostatic balance • 2 protective coverings for the brain and spinal cord • Outer covering: bone • Inner covering: membrane called meninges

  3. 3 layers that make up the meninges • 1. Dura mater (outer): made of strong white fibrous tissue • Forms the inner periosteum of the cranial bone • 2. Arachnoid membrane: delicate cobwebby middle layer • 3. Pia mater: transparent inner layer that connects to brain and spinal cord

  4. 3 important “inward” extensions of dura mater • 1. Falx cerebri: longitudinal fissure that separates the cerebral hemisphere into two parts • Superior sagittal sinus: located above the falx cerebri fissure • Stores blood from brain tissue for the return trip to the heart

  5. 2. Falx cerebelli: separates the cerebellum into two halves (right and left sides) • 3. Tentorium cerebelli: separates the cerebellum from the cerebrum • Forms a tent-like covering over the cerebellum

  6. 3 of several spaces found around the meninges • 1. Epidural space: immediately outside the dura mater, but inside the bony coverings of the brain and spinal cord • Contains supporting fat and connective tissue

  7. 2. Subdural space: is between the dura mater and arachnoid • Contains a small amount of lubricating serous fluid • 3. Subarachnoid space: is under the arachnoid and outside the pia mater • Contains a lot of cerebrospinal fluid

  8. The meninges of the cord continue down some distance after the end of the spinal cord • Filum terminale: slender filament of the pia mater that blends with the dura mater to form a cord that disappears into the periosteum of the coccyx

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