Myelencephalon Flashcards
1
Q
Ventral Median Fissure
A
Splits the medulla oblongata down the middle
2
Q
Pyramids
A
On each side of the ventral median fissure. A rounded prominence
3
Q
Pyramidal Tract
A
Major descending pathway that starts at the level of the cortex and extends all the way down to the ventral horns of the spinal cord
4
Q
Pyramidal Decussation
A
Point where 80% of motor nerve fibers cross to opposite side of the body
5
Q
Lateral Corticospinal Tracts
A
The 80% of the motor nerve fibers that cross are renamed this
6
Q
Anterior Corticospinal Tracts
A
The 20% of the motor nerve fibers that don’t cross are renamed this
7
Q
2 Major Dorsal Sensory Tracts of the Medulla Oblongata
A
Fasciculus gracilis and Fasciculus cuneatus
8
Q
3 Medulla Oblongata Reflex Centers and Functions
A
- Cardiac Reflex Center- Regulates rate and strength of the heart beat
- Vasomotor Reflex Center- Regulates and changes diameters of blood vessels
- Respiratory Reflex Center- Regulates the rate and rhythm of breathing
