First test Flashcards
L1 - Learning objectives
- Describe the major divisions of the nervous system
- Identify/describe the major external and internal features of the spinal cord
- Explain the consequences of spinal cord damage
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Organization of Nervous System
The central nervous system (CNS) is the:
The peripheral nervous system (PNS) is the:
Organization of Nervous System
The central nervous system (CNS) is the:
- INTEGRATING and COMMAND centre
The peripheral nervous system (PNS) is the:
- COMMUNICATION system linking all parts of the body to the CNS, via NERVES
Major subdivisions of the CNS
BRAIN:
Major subdivisions of the CNS
BRAIN:
- Cerebrum:
- Cerebral Hemispheres
- Diencephalon
- Brainstem:
- Midbrain
- Pons - Hindbrain
- Medulla Oblongata - Hindbrain
- Cerebellum:
- How much does the brain weigh?
- The Cerebrum takes up what percentage of the brain volume?
- What percentage of neurons does the cerebellum contain?
- 15 kg
- 83%
- 50%
What is grey matter?
What is white matter?
What is grey matter?
- (Neuron cell bodies)
- Group of cell bodies =
- Nucleus (CNS)
- Ganglion (PNS)
What is white matter?
- (myelinated Axons)
- Bundle of axons =
- Tract (CNS)
- Nerve (PNS)
Brain section summary:
What are the sections?
Brain section summary:
What are the sections?
- Axial (or Horizontal or Transverse)
- Side to Side
- Coronal
- Top to Bottom
- Sagittal
- Front to Back
- NOTE: there is also midsagittal
Orientation (direction): cerebrum
- Draw it L1, page 30
Orientation (direction): brainstem/spinal cord
- Draw it L1, page 31
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Spinal Cord Anatomy
The spinal cord extends from the:
What is the width and length of the spinal cord?
How many pairs of spinal nerves?
What does the spinal cord provide?
Spinal Cord Anatomy
The spinal cord extends from the:
- Foramen magnum to 1st or 2nd lumbar vertebra
What is the width and length of the spinal cord?
- Width of thumb
- ~42cm long
How many pairs of spinal nerves?
- 31
What does the spinal cord provide?
- Provides TWO-WAY street of information to and from the brain
What are the 31 pairs of spinals nerves?
What are the 31 pairs of spinals nerves?
- 8 cervical spinal nerves
- 12 thoracic spinal nerves
- 5 lumbar spinal nerves
- 5 sacral spinal nerves
- 1 Coccygeal spinal nerves
What are the two enlargements where nerves for upper and lower limbs arise?
What are the two enlargements where nerves for upper and lower limbs arise?
- Cervical enlargement
- Lumbar enlargement
What is the structure of the Conus medullaris (medullary cone)?
Where is the conus medullaris located?
What does the Conus medullaris allow?
What is the structure of the Conus medullaris (medullary cone)?
- Tapering conical structure
Where is the conus medullaris located?
- Below the lumbar enlargement
What does the Conus medullaris allow?
- Allows the filum terminale (terminal filum) to anchor the spinal cord to the coccyx (tail bone)
Cauda equaina (horse tail)
Roots of the nerves that arise from the?
Cauda equaina (horse tail)
Roots of the nerves that arise from the?
- Lumbar, sacral & coccygeal regions of the spinal cord and travel down the verebral column
Draw and label a transverse cross-section of a spinal cord
- Lecture 1, page 37
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Spinal cord - Grey Matter
Posterior (dorsal) horns:
Anterior (ventral) horns:
Spinal cord - Grey Matter
Posterior (dorsal) horns:
- incoming terminals from peripheral sensory neurons + interneurons
Anterior (ventral) horns:
- Motor neurons that go to the periphery + interneurons
Spinal Cord - Sensory Input & Motor Output
Draw
- L1, Page 41
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Spinal cord - White matter
What are the columns?
- Draw them
Spinal cord - White matter
What are the columns?
- Lateral columns
- Posterior (dorsal) columns
- Anterior (ventral) columns
Comparing Cross-section of Spinal Cord
- Draw, L1, page 43
- Where is there enlarged grey matter?
What does this mean?
Comparing Cross-section of Spinal Cord
Where is there enlarged grey matter?
- In cervical and Lumbar regions
What does this mean?
- More neurons are supplying muscles of upper (cervical) and lower (lumbar) limbs
Comparing Cross-section of Spinal Cord
What does white matter increase in?
What does this reflect?
Comparing Cross-section of Spinal Cord
What does white matter increase in?
-Increases in dorsal columns from lumbar to cervical regions
What does this reflect?
- Reflects increasing addition of sensory fibres from caudal to rostral truck regions
Spinal Cord Injury (SCI)
Paralysis?
Paraesthesia?
Spinal Cord Injury (SCI)
Paralysis?
- Loss of motor function
Paraesthesia?
- Sensory loss
Lecture 2 objectives
- Identify the ventricular system and describe the circulation/drainage of CSF
- Recognize the external surface features of the brain
- Identify/describe the three layers of meninges and their specializations
- Explain the clinical significance of meninges and the ventricular system
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Ventricular System
Brain:
Spinal Cord:
Contains?
Ventricular System
Brain: 4 ventricles - Lateral (2) - Third - Fourth
Spinal Cord:
- Central Canal
Contains?
- CSF
Ventricular system
- Have a look at L2, page 4
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Cerebrospinal Fluid (CSF)
Clear liquid (modified plasma) produced by … …. in each ventricle
Fills …. ….. & ….. ….., as well as the …. ….
Drained into … …. through the …. …..
Sampling of CSF - …. …..
Cerebrospinal Fluid (CSF)
Clear liquid (modified plasma) produced by CHOROID PLEXUS in each ventricle
Fills CEREBRAL VENTRICLES & SPINAL CANAL, as well as the SUBARACHNOID SPACE
Drained into VENOUS SINUS through the ARACHNOID GRANULATIONS
Sampling of CSF - LUMBAR PUNCTURE
Communication/Continuity of Ventricles
What are the small openings or channels?
Communication/Continuity of Ventricles
What are the small openings or channels?
- Cerebral aqueduct
- Interventricular foramen
- Lateral aperature