Lecture 1 Nerve/Spinal Cord Info

Question 1

Arachnoid Mater

Answer 1

Around Pia Mater

Non Vascular

Thin, Delicate

Trabeculae extend across subarachnoid space and connects to the pia mater

CSF holds it to the surrounding Dura Mater

Question 2

Duramater

Answer 2

Innervation by the recurrent meningeal nerve

Outermost layer of spinal Meninges

Tough, protective

Begins at the foremen mangnum

The Thecal Sac (Dural Sac) ends at S2

Question 3

Pia Mater

Answer 3

Vascular membrane

Innermost around meninge spinal cord

Invests all the surfaces of the spinal cord, nerve roots, and blood vessels

Question 4

What does the pia mater form?

Answer 4

Denticulate ligaments and fulminate terminale

Question 5

Denticulate ligament function

Answer 5

Run the entire length of the spinal cord

Extends and attaches to the duramater

1st attaches at foremen magnum

Question 6

Filum Terminal

Answer 6

Holds the conus medularis to coxxyx

^^^ Stabilizes the distal end of the spinal cord

Question 7

Lumbar cistern

Answer 7

Enlargement of the subarachnoid space

Caudal to conus medularis

Contains CSF

CAUDA EQUINA and Philum Terminale are here

Question 8

Epidural space

Answer 8

External to duramater

Recurrent meningeal nerve is here

Internal vertebral plexus of veins here

Contains arteries, lymphatic vessels, and epideural fat

Question 9

Why are some nerve fibers myelinated and others are unmyelinated?

Answer 9

Myelinated axons are present in the somatic nervous system, as it demands quicker responses and transmission of data

Unmyelinated axons are present in the peripheral nervous system (sympathetic and parasympathetic)

Question 10

Unmyelinated axons are responsible for sending impulses like: (example)

Answer 10

Secondary pain or itching

Question 11

Myelinated axons are equipped to send much faster impulses than unmyelinated axons. What is an example?

Answer 11

Central and peripheral nervous system

Muscle contractions

Question 12

Spinal cord

Answer 12

Begins at foramen magnum

Ends at L1 and L2 in adults

Question 13

Two enlargements of the spinal cord

Answer 13

Cervical and lumbar

Question 14

Caudal end of the spinal cord

Answer 14

Conus medualaris

Question 15

Nerve Plexi are formed by:

Answer 15

The ventral primary rami

Question 16

In the cervical vertebral region, where do the nerves protrude from the vertebra of origin?

At what point on the spine does this change?

Answer 16

nerves protrude from above the cervical vertebrae that they originate from

This changes in the thoracic region of the spine (T1)