Spinal Cord - Lec. 17

Question 1

Where does the spinal cord start and end

Answer 1

begins: medulla oblongata
ends: L1-2 vertebrae (ending part called conus medullaris)

Question 2

Conus medullaris is anchored to the coccyx by a strand of fibrous tissue extending inferiorly from the conus medullaris that is called:

Answer 2

Filum terminale

Question 3

What are the two regions of increased diameter regarding the spinal cord?

Answer 3

Cervical enlargement
- gives rise to the spinal nerves that innervate the upper limbs
Lumbar enlargement
- gives rise to the spinal nerves that innervate the lower limbs

Question 4

What is A

Answer 4

Posterior median sulcus

Question 5

What is B

Answer 5

Anterior median fissure

Question 6

What is C

Answer 6

Central canal

Question 7

What is D

Answer 7

White matter

Question 8

What is E

Answer 8

Grey matter

Question 9

What is white matter composed of

Answer 9

Myelinated axons

Question 10

What is grey matter composed of

Answer 10

Un-myelinated axons and cell bodies

Question 11

What is A

Answer 11

Posterior horn

Question 12

What is B

Answer 12

Lateral horn

Question 13

What is C

Answer 13

Anterior horn

Question 14

What is A

Answer 14

Posterior columns

Question 15

What is B

Answer 15

Lateral Columns

Question 16

What is C

Answer 16

Anterior columns

Question 17

Posterior, lateral and anterior columns of white matter contain:

Answer 17

Sensory and motor tracts

Question 18

The posterior horn of the grey matter contains:

Answer 18

Cell bodies of interneurons that relay SENSORY signals up the spinal cord

Question 19

The lateral horn of grey matter contains:

Answer 19

Cell bodies of AUTONOMIC motor neurons

Only present in T1-L2 and S2-S4 segments

Question 20

The anterior horn of the grey matter contains:

Answer 20

Cell bodies of SOMATIC motor neurons

Question 21

How many segments is the spinal cord divided into

Answer 21

31

Question 22

How many pairs of cervical spinal nerves are there

Answer 22

8

Question 23

How many pairs of thoracic spinal nerves are there

Answer 23

12

Question 24

How many pairs of lumbar spinal nerves are there

Answer 24

5

Question 25

How many pairs of sacral spinal nerves are there

Answer 25

5

Question 26

How many pairs of coccygeal spinal nerves are there

Answer 26

1

Question 27

What is A

Answer 27

Posterior root

Question 28

What is B

Answer 28

Posterior root ganglion

Question 29

What is C

Answer 29

Spinal nerve

Question 30

What is D

Answer 30

Anterior root

Question 31

What is the posterior root made up of

Answer 31

Axons of SENSORY neurons

Question 32

What is a posterior root ganglion composed of

Answer 32

SENSORY Cell bodies

Question 33

What is the spinal nerve made up of

Answer 33

Sensory and motor axons

Question 34

What is the anterior root made up of

Answer 34

Axons of MOTOR neurons

Question 35

True or false: signals entering the spinal cord never do so via the anterior root

Answer 35

True: anterior root is a one way street for motor axons

Question 36

True or false: signals exiting the spinal cord never do so via the posterior root

Answer 36

True: posterior root is a one way street for sensory axons

Question 37

Spinal nerves emerge from the vertebral column between adjacent vertebrae through _________.

Answer 37

The intervertebral foramina

Question 38

C1 - C7 spinal nerves exit _________ to the their corresponding vertebrae

Answer 38

Superior

Question 39

C8 spinal nerves exit ______ C7 & T1

Answer 39

Between

Question 40

Thoracic/lumbar spinal nerves exit ________ to their corresponding vertebrae

Answer 40

Inferior

Question 41

What is A

Answer 41

Intervertebral foramen

Question 42

What is A

Answer 42

Cauda Equina (horses tail)