Lecture 3: Structural Organization

Question 1

What are the two paired skull bones?

Answer 1

Parietal and temporal

Question 2

What are the four unpaired skull bones?

Answer 2

Frontal, occipital, sphenoid, and ethmoid

Question 3

Number of vertebrates in each segment

Answer 3

C: 7, T: 12, L: 5, S: 5, C: 1 (fused)

Question 4

Four folds of the dura mater

Answer 4

Falx cerebri, tentorium cerebelli, falx cerebelli, diaphragma sellae

Question 5

What is a dural sinus?

Answer 5

Channels critical for venous blood and CSF circulation running between the skull-lining and inner dural layer

Question 6

What is one prominent dural sinus?

Answer 6

Superior longitudinal sinus

Question 7

Subarachnoid cisterns

Answer 7

Large pools of CSF in which the pia mater and arachnoid is widely separated

Question 8

Arachnoid villi

Answer 8

Finger-like extensions of the arachnoid into the dural sinuses

Question 9

Describe meningiomas

Answer 9

Slow-growing, benign, encapsulated tumors of the meninges; commonly found at sinuses

Question 10

Two layers of pia mater

Answer 10

Pia intima (forms outer wall of perivascular space) and epipia (continuous with arachnoid trabeculae)

Question 11

What is the tip of spinal cord called?

Answer 11

Conus medullaris

Question 12

What connects the spinal cord to the dura mater? (2)

Answer 12

Dentate ligaments and coccygeal ligament

Question 13

Where are blood vessels found in the spinal cord? What about in the cerebrum?

Answer 13

Epipial tissue; pia intima (in subarachnoid space)

Question 14

How many pairs of spinal nerves?

Answer 14

31

Question 15

In the cerebrum there are ___ distinct layers of dura. In the spinal cord there are ___

Answer 15

Two; one (no outer layer)

Question 16

What is the end the spinal pia mater?

Answer 16

Filum terminale