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1. (Underneath)
Arachnoid Membrane
Pia Matter

2. • Made of strong white fibrous tissue
• Outer layer of the meninges
• Inner periosteum of the cranial bones
• Protects inner layers including brain
• Delicate cob-web like
• Between Dura matter and Pia matter
• Adheres to outer surface of meninges
• Transparent
• Adheres to outer surface of the brain and spinal cord
• Contains blood vessels

3. Cervical Plexus
(C1 through C4)
Brachial Plexus
(C5 through T1)
Lumbar Plexus
Sacral Plexus
L4 and L5 through
S1 and S4

4. • Innervate the muscles and skin of the neck, upper
shoulders, and part of the head
• Exiting the plexus, phrenic nerve, which innervates
the diaphragm
• Deep within shoulder
• Passes from ventral rami of spinal nerves C5 through T1
• Beneath clavicle
• Toward upper arm
• Innervates the lower part of the shoulder and entire arm

5. • Made from intermingling fibers from the first four
lumbar nerves
• Lumbar region of back
• Divides into many branches supplying the thighs
and legs
• Formed fibers from the fourth and fifth lumbar
nerves and the first four sacral nerves
• Lies in pelvic cavity on the anterior sirface of the
piriformis miuscle
• Forms the sciatic nerce
• Through buttocks and back of thigh
• Supplies all leg skin

6. Spinal cord lies in
the spinal
cavity, from the
foramen magnum
to the lower border
of the first lumbar
vertebra.

7. • Within spinal cavity
• From foramen magnum to the lower border of the first
lumbar vertebra
• Averages about 18 inches
• Conducts information to and from brain
• Reflex center for all spinal reflexes