Brain

Brain

1. Spinal cord

   • Inner gray cellular substance (has H shape on transverse section.
   • White outer fibrous substance.
   • Extends from the brain (connects at the medulla oblongata) to L1-2
   • conus medullaris: pointed extremity (end of spinal cord)
   • 18-20 in long connected to 31 s=spinal nerves.
   • Spinal cord and nerves work together to transmit and receive sensory, motor, and reflex messages to and from the brain.

2. Meninges

   • 3 continuous protective membranes:
     • Inner Sheath: Pia Mater (Latin "tender mother")
       • closest to brain and spinal cord
     • Central Sheath: arachnoid
       • Space around cns.
         • contain CSF surrounds and cushions
     • Outer Sheath: dura mater (Latin "hard mother")
       • Strong fibrous covering of the brain and spinal cord.
         • outer portion lines the cranial bones (periosteum)
           • inner portion protects the brain and supports the blood vessels

3. consist of the cerebrum, cerebellum, and brain stem.

   • The brain stem:midbrain, pons, and medulla oblongata
     • cortex: outer portion of gray matter. inner portion white matter.

4. corpus callosum is between the cerebral hemispheres.

5. Pituitary glad rest in the sellica turcica.

6. Longitudinal sulcus seperates cerebrum left from right

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