Lecture 2- Spinal Cord

Question 1

How many segments in the spinal cord

Answer 1

31

Question 2

Where is the spinal cord located?

Answer 2

Within the vertebral canal of the vertebral column

Question 3

Protective structures?

Answer 3

1- hard bony skull and vertebral columns
2-meninges (three membranes between bony encase meant and nervous tissue)
3-cerebrospinal fluid between meningeal membranes

Question 4

Spinal cord extends down from?

Answer 4

The Medulla Oblongata

Question 5

Spinal cord divisions?

Answer 5

8 cervical pairs 
12 Thoracic pairs
5 Lumbar pairs
5 Sacral pairs
1 Coccygeal pair

Question 6

Diameter of spinal cord?

Answer 6

Roughly 3cm but has
Cervical enlargement: C4-T1
Lumbar enlargement: t9-t12
Ends at L2 with CONUS MEDULLARIS

Question 7

Roots of L1 down?

Answer 7

The CAUDA EQUINA and these roots of lower spinal nerves angle inferiorly

Question 8

The ______ ________ _______ and the _______ _______ _______ are grooves that penetrate the white matter.

Answer 8

Anterior median fissure

Posterior median sulcus

Question 9

Gray matter?

Answer 9

Consists of cell bodies of neurons, unmyelinated axons + neuroglia. The GRAY COMMISSURE forms between sides and a CENTRAL CANAL containing cerebrospinal fluid is found in the middle connecting to 4th ventricle of medulla Oblongata.

Question 10

Map showing where nerves at different levels are used represents _______?

Answer 10

Dermatome - an area of the skin supplied by the nerves from a single spinal root

Question 11

Touch and pressure nerve ending?

Pain and temperature nerve ending?

Answer 11

Touch= Meissner Corpuscle (myelinated axon)
Pressure= Pacinian Corpuscle (myelinated axon)
Pain + temp= free nerve ending (unmyelinated axon)

Question 12

Describe the path of sensory nerves?

Answer 12

The enter the spinal cord via the dorsal/posterior roots and have their cell body in the dorsal root ganglion.

Question 13

What type of sensation is touch and pressure?

Answer 13

DISCRIMINATIVE SENSATION