Neuro

Question 1

what is the sixth cranial nerve

Answer 1

Abducens

Question 2

which nucleus does the sixth cranial nerve arise from

Answer 2

abducens nucleus

Question 3

What is the anatomical course of the abducens nerve?

Answer 3

Enters subarachnoid space
pierces dura mater
travels through the carvernous sinus
Eters the orbit through the superior orbital fissure

Question 4

where does the abducens nerve terminate

Answer 4

The Lateral Rectus

Question 5

What effect does the Lateral rectus have on the eye

Answer 5

it abducts the eye

Question 6

Where does the Lateral rectus originate from

Answer 6

Common tendinnous ring

Question 7

Where does the Lateral rectus originate from

Answer 7

Common tendinnous ring

Question 8

Which 2 paired arteries supply the arterial blood of the brain

Answer 8

Vertebral

Internal carotid

Question 9

Where does the external carotid supply

Answer 9

Supplies the face and scalp

Not that thought box of yours

Question 10

What is the function of the circle of Willis

Answer 10

If one of the cerebral arteries becomes blocked blood supply of the whole brain is not completely effected

Question 11

Where does your internal common carotid originate from

Answer 11

Arch of aorta

Common carotid bifurcates into the internal and external branches

Question 12

Name 3 branches of the vertebral arteries

Answer 12

Meninggeal
Anterior and posterior spinal
Posterior inferior cerebral

Question 13

What are the terminal branches of the interval carotid arteries

Answer 13

Arteries cerebral

Question 14

The posterior cerebral arteries are the terminal branches of what?

Answer 14

Vertebral arteries

Question 15

Define Axonal Transmission

Answer 15

Transmission of information from location A to location B

Question 16

Define Synaptic transmission

Answer 16

Integration and processing of infomration.

Question 17

where does cerebral spinal fluid run through?

with regards to the spinal cord!

Answer 17

The central canal

Question 18

Define Fassiculi

Answer 18

Bundles of nerve axons which run up and down the spinal cord.
contain axons which are going from or to similar locations.

Question 19

what does the Dorsal column convey?

Answer 19

Fine touch and Proprioception

Question 20

What are the Four nerve ending whcih sense finetouch

Answer 20

Meisners Corpuscles
Pacnian Corpuscles
Ruffini Endings
Merkel Endings

Question 21

What type of neurons are located in the dorsal root ganglion

Answer 21

Pseudounipolar neurons - because they have an axon which runs in two directions.

Question 22

Describe the course of the Dorsal Column

3 main points

Answer 22

Project from body to spinal cord
Ascends through brain stem
Synapses at the Cuneae ad Gracile nuclei - in the Medulla Oblongata
Decussates in medulla
synpases in the thalamus at the Ventral posterolateral nucleus
sends info to the post central gyri (primary sensory area of the brain)

Question 23

What are the 3 neurons of the Dorsal Column

Answer 23

1) Dorsal root ganglion
2) Cuneate/Gracile Nucleus
3) Ventral posterolateral nucleus of the thalamus.

Question 24

Is the Dorsal Column Ascending or descending? And therefore is it a motor or sensory tract

Answer 24

Ascending Tract
Sensory

Always smile dont moan

Question 25

Name the fascilulus that the upper limb neurons travel through (dorsal column)

Answer 25

Cunate Fasciculis

Question 26

Gracile Fasciluls contains neurons from where?

Answer 26

Lower Limb of the Dorsal Column

Question 27

What does the spinothalamic Tract convey?

Answer 27

Conveys sensation of Pain Temperature and Crude Touch

Question 28

What neurons are in the Spinothalaic tract?

Answer 28

pseudounipolar neurons

Question 29

Is teh Spinothalamic tract Sensory or Motor?

Ascending or descending?

Answer 29

Sensory and Ascending

Question 30

How many times to the Spinothalamic tract Synapse? where does the spinothalamic tract synpase?

Answer 30

2 times …
In the Spinal cord at the dorsal Horn of the spinal column
In the thalamus

Question 31

What is the role of the Lissauers Fasciculus in the Spinothalamic tract?

Answer 31

where the tract ascends up through for 1/2 levels before it decussates.

Question 32

How many neurons are in the pathway of the Spinothalamic tract and name each one

Answer 32

3 neurons

1) Dorsal Root Ganglion
2) Dorsal horn of the spinal cord
3) Thalamus

Question 33

Where does the Spinothalamic tract decussate

Answer 33

At the anterior white commisure in the spinal cord:

Important as has strong clinical relevance.

Question 34

What does the Corticospinal Tract Convey

Answer 34

Motor Control of Limb and Axial

Brain controlling movement of muscles

Question 35

Where does the CorticoSpinal Tract begin

Answer 35

PRE central gyri in the cortex

This is the primary Motor Cortex

Question 36

Describe the path of the Corticospinal tract

Answer 36

Descends through Brainstem
75-90% decussate in the medulla
down spina cord to target level.
Synapse and the innervate the muscles directly

Question 37

Which nerves decussate in the medulla and what % is it

Answer 37

The Nerves which innervate the limbs decussate in the medulla. 75-90% of the fibres decussate here
The lateral corticospinal tract

Question 38

Where does the anterior Cortico Spinal tract decussate

Answer 38

In the Spinal cord, at the level it is targetting in the anterior white commisure. It then synapses in the anterio horn of the grey matter