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ANA 417G > 1. CNS Organization I > Flashcards

1. CNS Organization I Flashcards

1
Q

What fissure divides the brain into 2 cerebral hemispheres?

A

Longitudinal Fissure

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2
Q

Name the 4 Brain Lobes

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

What sulcus separates the frontal cortex from the parietal cortex?

A

Central sulcus

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4
Q
  1. The bumps in the brain are called?
  2. The grooves?
A
  1. Gyri
  2. Sulci
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5
Q

What does the Lateral Sulcus (Sylvian Fissure) separate?

A

The Temporal cortex from the Parietal & Frontal Cortices

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6
Q

What separates the parietal cortex from the occipital cortex?

A

Parieto-occipital sulcus

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7
Q
  1. The primary motor cortex is which gurus?
  2. The primary somatosensory cortex is which gurus?
A
  1. Precentral gurus
  2. Postcentral gurus
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8
Q

Which gurus is responsible for conscious awareness of somatic senses?

A

Postcentral gyrus

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9
Q

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

A

Transverse gyrus of Heschl

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10
Q

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

A

White Matter

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11
Q

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

A
  1. Leg/foot
  2. Hand
  3. Face
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12
Q

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

A

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

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13
Q

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

A

Sensory Homunculus

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14
Q

Middle cranial fossa contains what lobe of the brain?

A

Temporal Lobe

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15
Q

Posterior cranial fossa contains what?

A
  1. Occipital Lobe
  2. Cerebellum
  3. Brain Stem
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16
Q

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

A
  1. Dura Mater
  2. Arachnoid Mater
  3. Pia Mater
17
Q

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

A

Arachnoid Mater & Pia Mater

18
Q

Meninges: What layer separates into two sub layers?

A

Dura Mater

19
Q

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

A

Keeps CSF volumes inside of the brain

20
Q

Meninges: Name the two sublayers of Dura Mater

A
  1. Perionsteal Layer
  2. Meningeal Layer
21
Q

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

A

Subarachnoid Space

22
Q

Arachnoid Granulations. Extensions of the arachnoid membrane do what?

A

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

23
Q

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

A
  1. Third Ventricle
  2. Fourth Ventricle
  3. Lateral Ventricles (2 total)
24
Q

Ventricles: What within the ventricles produces CSF?

A

Choroid Plexus

25
Q

The 4 roles of CSF?

A
  1. SUPPORT for heavy brain
  2. PROTECTION by fluid cushion
  3. NOURISHMENT by composition
  4. REMOVAL of waste materials
26
Q

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

A

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

27
Q

Ventricles: What connects the Lateral to the Third?

A

Interventricular Foramen

28
Q

Ventricles: What connects the Third to the Fourth?

A

Cerebral Aqueduct

29
Q

Ventricles: What connects the Fourth to the Subarachnoid space?

A

1 medial and 2 lateral openings

30
Q

What is the name for CSF buildup in ventricular system?

A

Hydrocephaly

31
Q

What is communicating Hydrocephaly?

A

Caused by overproduction or poor absorption

32
Q

What is non-communicating Hydrocephaly?

A

CSF flow interruption

33
Q

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

A
  1. Internal carotid arteries
  2. Vertebral arteries
34
Q

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

A
  1. Anterior Cerebral Arteries (ACA)
  2. Middle Cerebral Arteries (MCA)
35
Q

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

A

Vertebral Arteries

36
Q

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

A
  1. Frontal Lobe
  2. Parietal Lobe
  3. Temporal Lobe
37
Q

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

A
  1. Frontal Lobe
  2. Parietal Lobe
38
Q

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

A

Occipital Lobe (medial aspect of Temporal Lobe)

ANA 417G (8 decks)

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