1. Spinal Meninges Three membranes surround all of CNS 3) Pia mater
1) __________- "tough mother", strong
2) _________- spidery looking, carries blood vessels, etc.
Subarachnoid space
3) ________- "delicate mother", adheres tightly to surface of spinal cord
3) Pia mater
2) Arachnoid
1) Dura mater

2. Sectional anatomy of the spinal cord
__________________________and unmyelinated axons
Gray matter is cell bodies, unmyelinated axons and neuroglia
Projections of gray matter toward outer surface of cord are horns

3. The Sectional Organization of the Spinal Cord

4. Organization of Cord Cross Section
_________- interior horns
posterior - somatic and visceral sensory nuclei
anterior (and lateral) gray horns – somatic and visceral motor control
gray commissures - axons carrying information from side to side
_________- tracts or columns
posterior white column -
anterior white column
lateral white column
anterior white commissure
functions
ascending tracts - sensory toward brain
descending tracts - motor from brain
Fig 14-5

5. Horns of spinal cord
Posterior gray horn contains somatic and visceral sensory nuclei
Anterior gray horns deal with somatic motor control
Lateral gray horns contain visceral motor neurons
Gray commissures contain axons that cross from one side to the other

6. Peripheral Nerves Definition: bundles of axons. AKA tracts in CNS
Organization – coverings:
_____________ wraps entire nerve
___________ wraps fascicles of tracts
_____________ wraps individual axons

7. 31 pairs of spinal nerves Nerves consist of: Epineurium Perineurium
Endoneurium

8. Dermatomes
Sensory innervations by specific spinal nerves  Each pair of spinal nerves monitors specific region of body surface.
Clinical significance ?

9. Nerve plexus Complex interwoven network of nerves Four large plexuses
Cervical plexus
__________
Lumbar plexus
_____________

10. Peripheral Nerves and Nerve Plexus

11. The Brachial Plexus

12. The Branchial Plexus

13. The Branchial Plexus

14. The Lumbar and Sacral Plexuses

15. The Lumbar and Sacral Plexuses