2- spinal cord general topography and internal structure - week 1

Question 1

Where dose the spine cord begin and where dose it end ?

Answer 1

• Begins at:Foramen magnum
• Ends at: L3 (newborn), L1 (adult)

Question 2

What is the length of the spinal chord in males ?

Answer 2

About 45 cm and it is long in males

Question 3

What is superior of the spinal cord ?

Answer 3

Medulla obongata

Question 4

What are the two enlargements of the spinal cord ?

Answer 4

• cervical enlargement
• lumbar enlargement

Question 5

Where is the cervical enlargement ?

Answer 5

– The region where Spinal nerves form the brachial plexus
– Diameter, about 38 mm

Question 6

Where is the lumbar enlargement ?

Answer 6

– The region where Spinal nerves form the lumbosacral plexus
– Diameter, about 35 mm
– After lumbar enlargement it becomes thin and forms conus medullaris ( this is the lower end of Spinal cord)

Question 7

Where is the conus medullaris & cauda equina ?

Answer 7

The Spinal cord narrows below after lumbosacral enlargement, Conus medullaris ; is the at thelower end of spinal cord, Cauda equina (pony tail):Below conus medullaris Roots of spinal nerves Surrounding the filum terminale.

Question 8

What are meninges ?

Answer 8

They are membranes that surround the spinal cord

Question 9

What are denticulate ligament ?

Answer 9

Spinal cord is suspended within dural sac by denticulate ligaments on
each side; It is the Extension of pia mater; 20 – 22 in number ,With arachnoid mater attaches to the inner surface of dural sac

Question 10

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