1. CNS Organization I

Question 1

What fissure divides the brain into 2 cerebral hemispheres?

Answer 1

Longitudinal Fissure

Question 2

Name the 4 Brain Lobes

Answer 2

1. Frontal Lobe
2. Temporal Lobe
3. Parietal Lobe
4. Occipital Lobe

Question 3

What sulcus separates the frontal cortex from the parietal cortex?

Answer 3

Central sulcus

Question 4

1. The bumps in the brain are called?
2. The grooves?

Answer 4

1. Gyri
2. Sulci

Question 5

What does the Lateral Sulcus (Sylvian Fissure) separate?

Answer 5

The Temporal cortex from the Parietal & Frontal Cortices

Question 6

What separates the parietal cortex from the occipital cortex?

Answer 6

Parieto-occipital sulcus

Question 7

1. The primary motor cortex is which gurus?
2. The primary somatosensory cortex is which gurus?

Answer 7

1. Precentral gurus
2. Postcentral gurus

Question 8

Which gurus is responsible for conscious awareness of somatic senses?

Answer 8

Postcentral gyrus

Question 9

What gyrus is located deep in the brain and is the primary auditory cortex?

Answer 9

Transverse gyrus of Heschl

Question 10

Within the brain, which of the two describes Ascending and Descending myelinated fibers?
1. Grey Matter
2. White Matter

Answer 10

White Matter

Question 11

Motor homunculus 3 major features top to bottom (lateral view)

Answer 11

1. Leg/foot
2. Hand
3. Face

Question 12

In the sensory homunculus, why is the right hand so large relative to the left foot?

Answer 12

There is a decreased number of neurons in the right postcentral gyrus that respond to left foot stimulation than neurons in the left postcentral gyrus that respond to right-hand stimulation

Question 13

Which of the Homunculus is located in the primary somatosensory cortex?

Answer 13

Sensory Homunculus

Question 14

Middle cranial fossa contains what lobe of the brain?

Answer 14

Temporal Lobe

Question 15

Posterior cranial fossa contains what?

Answer 15

1. Occipital Lobe
2. Cerebellum
3. Brain Stem

Question 16

Meninges: Three layers of connective tissue from outside to inside of the brain?

Answer 16

1. Dura Mater
2. Arachnoid Mater
3. Pia Mater

Question 17

Meninges: Between what two layers is there a large space filled with CSF?

Answer 17

Arachnoid Mater & Pia Mater

Question 18

Meninges: What layer separates into two sub layers?

Answer 18

Dura Mater

Question 19

Meninges: What does the one way valve do for the brain?

Answer 19

Keeps CSF volumes inside of the brain

Question 20

Meninges: Name the two sublayers of Dura Mater

Answer 20

1. Perionsteal Layer
2. Meningeal Layer

Question 21

Meninges: What is the space between Arachnoid Mater and Pia Mater called? (Connecting the two via trabeculae)

Answer 21

Subarachnoid Space

Question 22

Arachnoid Granulations. Extensions of the arachnoid membrane do what?

Answer 22

Creates a one way flow for reabsorbtion of CSF into subarachnoid space into the blood

Question 23

List the Ventricles based on these locations:
1. In the middle between the two thalami
2. Between pons and cerebellum
3. One in each hemisphere

Answer 23

1. Third Ventricle
2. Fourth Ventricle
3. Lateral Ventricles (2 total)

Question 24

Ventricles: What within the ventricles produces CSF?

Answer 24

Choroid Plexus

Question 25

The 4 roles of CSF?

Answer 25

1. SUPPORT for heavy brain 2. PROTECTION by fluid cushion 3. NOURISHMENT by composition 4. REMOVAL of waste materials

Question 26

Ventricles: Starting at the Lateral Ventricles, where does CSF flow?

Answer 26

Lateral Ventricle —> Third —> Fourth —> Subarachnoid space

Question 27

Ventricles: What connects the Lateral to the Third?

Answer 27

Interventricular Foramen

Question 28

Ventricles: What connects the Third to the Fourth?

Answer 28

Cerebral Aqueduct

Question 29

Ventricles: What connects the Fourth to the Subarachnoid space?

Answer 29

1 medial and 2 lateral openings

Question 30

What is the name for CSF buildup in ventricular system?

Answer 30

Hydrocephaly

Question 31

What is communicating Hydrocephaly?

Answer 31

Caused by overproduction or poor absorption

Question 32

What is non-communicating Hydrocephaly?

Answer 32

CSF flow interruption

Question 33

Blood Supply: Brain is supplied blood from the ___ and the ___.

Answer 33

1. Internal carotid arteries 2. Vertebral arteries

Question 34

Blood Supply: The Internal Carotid Arteries supply the brain by giving rise to… (2)

Answer 34

1. Anterior Cerebral Arteries (ACA) 2. Middle Cerebral Arteries (MCA)

Question 35

Blood Supply: What does the Posterior Cerebral Arteries (PCA) derive from?

Answer 35

Vertebral Arteries

Question 36

Blood Supply: What does the MCA supply in lateral aspects? (3)

Answer 36

1. Frontal Lobe 2. Parietal Lobe 3. Temporal Lobe

Question 37

Blood Supply: What does the ACA supply in Medial aspect?

Answer 37

1. Frontal Lobe 2. Parietal Lobe

Question 38

Blood Supply: What does the PCA supply in Medial aspect?

Answer 38

Occipital Lobe (medial aspect of Temporal Lobe)