Flashcards in NERVOUS SYSTEM PT 2 - STRUCTURE/FUNCTION OF CNS Deck (49)
A cluster of neurons in the CNS
A cluster of neurons in the PNS
Define a 'Tract'?
Axon bundles that interconnect neurons in the CNS
What is a 'Nerve'?
Axon bundles in the PNS
What do Peripheral Nerves connect?
Connects the spinal cord to the periphery
What do Cranial Nerves connect?
Connects the brain to periphery
Define Grey Matter?
Collection of UNMYELINATED NERVE FIBRES in the CNS
Define White Matter.
Collection of MYELINATED AXONS in the CNS
The extension of the spinal cord run from?
The brain stem to L2
What is the Conus Medullaris?
A structure at L2 where the spinal cord tapers into
What is the Cauda Equina?
Roots of spinal nerves below the Conus Medullaris
What is the Anterior Median Fissure and Posterior Median Sulcus?
Grooves that divide white matter into left and right sides
What is a Central Canal?
A tube centre of the spinal cord that contains CSF
GREY MATTER is divided into regions called?
Which neurons pass through the Posterior/Dorsal Horns contain?
Incoming sensory neurons and interneurons
Which neurons pass through the Anterior/Ventral Horns contain?
Where are Lateral Horns present, and what do they contain?
Present in thoracic, upper lumbar, and sacral portion. Contains Sympathetic Nuclei
WHITE MATTER is divided into 3 regions called?
Each white matter column contains ________ that have a common origin/destination.
Tract (axon bundles)
Sensory/Ascending Tracts conduct APs _______ the brain.
Motor/Descending Tracts conduct APs _______ the brain.
What are the 3 regions of the brain stem?
- Mid Brain
- Medulla Oblongata
The Midbrain of the brain stem, is the centre for?
Tracking visual activities and hearing
The Pons centre of the brain stem controls?
The Medulla Oblongata of the brain stem, is the centre control for?
What are Substantia Nigra?
A nuclei that make dopamine
What is Reticular Formation?
A net-like formation of neural tissue extending through brainstem, containing the Reticular Activating System (RAS)
What is the function of the Reticular Activating System (RAS)?
Consciousness and prevents sensory overload
The function of the Cerebellum is?
Coordinates skeletal muscle contraction, posture and balance