Spinal Cord Flashcards
What are the 3 major subdivisions of the somite?
1 dermatome
2 myotome
3. Sclerotome
What is the dermatome derivative?
Dermis
What is the myotome derivative?
Muscle
What is the sclerotome derivative?
Skeleton
Dermatome is the area of skin supplied with what fibers and by what singular root?
Supplied with afferent nerve fibers by a single posterior root
Myotome are all the muscles that are innervated by what singular root?
Single efferent anterior root
T/F: Most muscles are compose on only one myotome?
F. Most muscles are composed of MORE THAN ONE myotome
Cervical enlargement is what region of the spinal cord?
C3-T1
Lumbar enlargement is what spinal cord region?
L1-S2
Where does the conus medullaris end?
L2
What are the 3 plexuses and there region of the spinal cord?
Cervical = C1-C4 Brachial = C5-T1 Lumbosacral = L1-S4
What are the lumbar region 3 enlargements?
Conus equina, filum terminale, and conus medullaris
How many spinal nerve for: Cervical Thoracic Lumbar Sacral Coccygeal
Cervical = 8 Thoracic = 12 Lumbar = 5 Sacral = 5 Coccygeal = 1
On a spinal cord cross-section, what is the area of gray matter called?
Horns
On the spinal cord cross-section, what is the area of white matter called?
Columns
The dorsal root carries what type of fibers?
Afferent
Ventral root carries what type of fibers?
Efferent
Is the dorsal root associated with a ganglion? If so, what is the name of it?
Yes with the dorsal root ganglion (cell bodies of afferent neurons)
Spinal nerve carries what type of fibers?
Mixture of afferent and efferent fibers, visceral and somatic, and proprioceptive
Autonomic rami contains what type of communicans?
White and gray ramus communicans
The primary rami contain what type of nerves?
Dorsal and ventral
The dura mater is what layer?
Tough outer layer
The subarachnoid space contains what kind of fluid?
CSF
The pia mater is what layer?
Delicate innermost layer
