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Spinal Cord, what is it?
Link between brain and rest of body.
Has spinal nerves which carry motor & sensory stimuli.
How many pairs of spinal nerves are in the:
Cervical: 8 pairs of spinal nerves attached to the cervix.
Thoracic: 12 pairs
Lumbar: 5 pairs
Sacral: 5 pairs
What is the Conus medullaris? (clinical importance)
What is the Filum terminale?
What is the Cauda equina?
"Inferior end of spinal cord". (L1 - L2)
A strand of pia mater off end of conus.
"horse's tail"-Nerve roots from inferior end of the spinal cord.(All above 3 parts are a part of the Conus medullaris & cauda equina)
Spinal Cord Meninges.
Pia, Arachnoid, Dura
Piamater: surface of spinal cord.
Arachnoid mater: CSF
Dura mater: thick outer layer
Features of the Spinal Cord.Segment.
*locate on slide: posterior/anterior
- Posterior & lateral horns are interconnected.
- (lateral/anterior horn) motor function
- (Posterior) sensory function
White matter: (posterior/lateral/anterior) funiculus; white commissure.
Gray matter: (posterior/lateral/anterior) horn; gray commissure
Cross Section of Spinal Cord with Spinal Nerves
Dorsal root ganglion (cell bodies associated w/ dorsal root)
What's the function of the intervertebral foramina?
Posterior and Anterior Roots.
What do the posterior roots contain?
Joing of posterior/anterior roots form?
Sensory cell bodies: posterior root ganglia.
Interneurons: anterior horn of spinal cord.
Joinging: of a posterior and anterior form a spinal nerve.
Posterior and Anterior Rami
Distribution of Posterior Rami
What are they innervated by?
Innervated by plexuses formed by dorsal rami.
What is the Nerve Plexus?
2 largest nerve plexuses are...
Network of anterior rami
Allows nerves formed from spinal nerves
- 2 largest nerve plexuses:
- 1) brachial
- 2) lumbosacral
Spinal Nerves pairs on Cervix (slide)
Above C1: C1
Below C1: C2
Below C2: C3
Below C3: C4
Below C4: C5
Below C5: C6
Below C6: C7
Below C7: C8
Below T1: T1
Significance of brachial plexus? (upper extremities)
Travels between C5-T1 (cervix 5 to Thoracic 1)
C5-T1: Brachial Plexus
Musculocutaneous, Median, Ulnar
*Muscles innervated; what do they do? Location? Distribution?
(Example exam ?) Shoulder has numbness?
Shoulder numbness: Axillary Nerve
Main function of biceps brachii?
Main function of biceps: Flex at the elbow.
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