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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 region
Thoracic region
Lumbar region
Sacral region

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.

(white/gray) parts

*locate on slide: posterior/anterior
-Posterior
-Lateral
-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

Label parts:
DH/VH
LF/AF/TF
Dorsal horn
Dorsal root
Dorsal root ganglion (cell bodies associated w/ dorsal root)
Ventral root
Spinal nerve
What's the function of the intervertebral foramina?
Posterior and Anterior Roots.

What do the posterior roots contain?

Joing of posterior/anterior roots form?

Central processes.

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?

Allows?

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)

(connections)

Travels between C5-T1 (cervix 5 to Thoracic 1)
C5-T1: Brachial Plexus

Nerves (branches)

Musculocutaneous, Median, Ulnar

Know:
*Muscles innervated; what do they do? Location? Distribution?
Axillary Nerve

(locate)

Teres minor/Deltoid

(Example exam ?) Shoulder has numbness?

Shoulder numbness: Axillary Nerve
Musculocutaneous Nerve

(locate)

Main function of biceps brachii?

Main function of biceps: Flex at the elbow.
Radial Nerve

(locate)

Author

Anonymous

138066

Card Set

ANAT.

Description

Spinal Cord

Updated

2012-02-27T15:56:03Z