Unit 4 Flashcards
The average length of the spinal cord is?
16-18 inches
The maximum diameter of the cord is?
about 1.3cm at the cervical enlargement
At what cord level is the cervical enlaregment the biggest?
at C5-C6
Approximately what does the spinal cord weigh?
27-35 grams
What is the superior boundary of spinal cord?
the foramen magnum; or superior most ventral rootlet of C1 spinal nerve
What is the inferior boundary of the spinal cord?
The disc between L1-L2; or conus medullaris
How many spinal nerve pairs exist in the PNS?
31
Dorsal roots contain what type of fibers?
sensory or afferent
Ventral roots contain what type of fibers?
motor or efferent fibers
How are cervical nerves named?
the nerve is named for the vertebrae below
Give an example of a cervical nerve naming
C4 nerve exits between C3 and C4 vertebrae
How are thoracic nerves named?
the nerve is named for the vertebrae above
Give an example of a thoracic nerve naming
T1 nerve exits between T1 and T2 vertebrae
How are lumbar nerves named?
the nerve is named for the vertebrae above
Give an example of a lumbar nerve naming
L1 nerve exits between L1 and L2 vertebrae
Where do sacral nerves S1-S4 exit?
through dorsal and ventral sacral foramina
Where does sacral nerve S5 exit?
through the sacral hiatus
What other nerve exits through the sacral hiatus besides S5?
coccygeal nerve 1
At what point of development is the spinal cord and vertebral column the same length?
the first three months
At birth what level is the Co1 nerve at?
L1-L3
In adulthood what level is the Co1 nerve found?
about L1-L2
At what cord level injury is considered quadriplegic ?
C8 and above
At what cord level injury is considered paraplegic?
T1 and below
At what area are cord and vertebral level the same?
in the cervical area