1. Spinal Cord and Nerves

2. Organization of Nervous System
Central Nervous System (CNS) = _______________
Peripheral Nervous System (PNS) = __________
CNS
PNS

3. Peripheral Nervous System
___
_____

4. Spinal Nerves (______)
Each pair of nerves located in particular segment (_____________________ etc.)
Each nerve pair is _______ for the vertebra sitting above it (i.e. nerves ___________)
__ pairs of _______ spinal nerves; *C1-C8
__ pairs of _______ spinal nerves; T1-T12
__ pairs of _____ spinal nerves; L1-L5
___ pairs of ______ spinal nerves; S1-S5
1 pair of _________ spinal nerves; C0

5. Spinal Cord Segments

6. Meninges of Brain and Spinal Cord
_________(deep)
delicate
highly vascular
adheres to brain/sp cd tissue
____________ (middle)
impermeable layer = barrier
raised off pia mater by rootlets
____________ (most superficial)
single dural sheath
______________
between arachnoid and pia mater
contains CSF
___________________
Between dura mater and vertebra
Contains fat and veins

7. Spinal Cord facts Passes inferiorly through _______ into _________
__ pairs of _____ nerves branch off spinal cord through ______ ___________
Spinal cord made of a core of ___ ________ surrounded by _____ _________
Pg 393

8. Spinal Cord Growth Runs from __________ to level of L1 (adults)
Runs to level of L 3-4 (infants)

9. Regions of Spinal Cord Cervical _________ Lumbar ________ Coccygeal
Cervical + Lumbar enlargements
Cauda equina
Conus medullaris
Filum terminale
Pg 393

10. Review of Neuron Anatomy
Pg 339
Cell body
________
Axon
Interneuron
neuron
Pg 342

11. Types of Nerve Fibers
_____ = Afferent Nerve fibers = picked up by ________ throughout body (PNS) and carried TOWARDS ______________ (CNS)
______ = Efferent Nerve fibers = carried ___________ by nerves of PNS to innervate body’s muscles and glands
Remember: SAME, Sensory- Afferent…..

12. 4 Kinds of Nerve Fibers ______ Sensory – “_____ senses”
touch, ______, temperature, vibration of body, muscles stretching, _________
_______ Sensory – “______ senses”
Stretch, ____, temperature in organs
(eg) _______, hunger, cramps
_________ Motor – “body movement”
_________contraction of skeletal muscles
_________ – “organ movement”
Contraction of ____________, glands
= Autonomic Nervous System

13. Cross Section of Spinal Cord
Gray Matter
“________________
Gray Commissure = crossbar of “H”
Central Canal = in gray commissure
Posterior/Dorsal horns
Anterior/Ventral horns
Composed of
______________
Unmyelinated axons
___________
Neuroglia

14. Gray Matter
_____________
___________
_____________
____________

15. Gray Matter
Posterior Horns = made of _______ transmit info from cell bodies _______ of spinal cord ____ the sp cd
Dorsal Root contains Sensory Fibers
Somatic Sensory (SS)
Visceral Sensory (VS)
______________-swelling in dorsal root that these _____________ pass through
_________ = made of cell bodies of that send axons OUT of sp cd to __________________
Ventral Root contains Motor Fibers
Visceral Motor
Somatic Motor