1. Upper & Lower Motor Systems
Lab 9
Upper & Lower Motor Systems

2. 1 SMA FEF PMA What is the ~location of the: Prefrontal Cortex?
Motor planning
FEF
PMA
Motor planning
Of voluntary
action
Prefrontal Cortex
Processing sensory and memory info
Decision making
What is the ~location of the:
Prefrontal Cortex?
PMA (premotor area)?
SMA (supplementary motor area)
FEF (frontal eye field)

3. 1 2

4. 1 2 3

5. 1 4 2
Thalamus 3

6. Thalamus 1 2
Lentiform Nucleus 3

7. 1 2 3
Putamen
(lentiform nucleus)

8. 1 2 3 4 ant. limb, Int. capsule (frontal eye field fibers)
head of caudate
nucleus
frontal horn,
lateral ventricle 2 3
optic chiasm 4
putamen
ICA

9. 2 3 4 1 5 6 Post. limb, int. capsule: corticospinal + corticopontine
+ thalamocortical fibers 3
Body of lateral ventricle
thalamus 4
descending cortical
fibers in crus cerebri
of midbrain 1 5
III Ventricle
Lentiform nucleus
(only putamen is visible) 6

10. What descending fibers from the primary motor
cortex have degenerated in the indicated areas?

11. Midbrain/Thalamic Junction
Abbreviations: CS = corticospinal
CB = corticobulbar
Position of: oculomotor
nucleus + nerve roots 3 2 4 CB 1 CS
optic tract 6 CB CS 7
Oculomotor
nerve roots
nucleus 8 9 10
Red nucleus 5
RED
NUCLEUS
Midbrain/Thalamic Junction

12. descending
cortical fibers 1 2
MLF
Trochlear
nucleus 3
Caudal Midbrain

13. Mid Pons 4 3 5 7 2 6 1 8 reticular formation with
descending rubrospinal
fibers 3
descending
cortical fibers 5
descending
cortical fibers
trigeminal nerve & nerve roots 7
motor nuc.
of V 2 6 1
Nerve
Roots
of V
motor
nucleus
of V 8
Mid Pons

14. Caudal Pons 5 8 nucleus 9 fibers 4 3 7 nerve 2 1 10 11 nerve nucleus 6
Reticular formation
with reticular nuclei
& descending rubro-
spinal fibers 5 8
nucleus
facial
nucleus
descending
cortical fibers
9 fibers
descending
cortical fibers
abducens nerve
roots 4 3
7 nerve
exit of facial
nerve roots 2
facial
nucleus 1
Facial nerve
roots 10
nucleus
abducens
nucleus
exit of VI nerve
roots
11 nerve
abducens
nucleus 6
Caudal Pons

15. Rostral Medulla 3 4 2 nerve 8 1 nerve 9 11 10 6 5 7
reticular formation with
reticular nuclei + & descending
rubrospinal & reticulospinal
fibers
Pyramidal
(corticospinal) tract 4 3
Hypoglossal
nerve roots
2 nerve 8
pyramidal
tract 1
nerve
Vagal
Nerve
roots
nuc.
ambiguus 9
Hypoglossal
nuc. 11 10
Vest.
Nuc.
nucleus
ambiguus
vestibular
nuclei 6 5
hypoglossal
nucleus 7
Rostral Medulla

16. Caudal Medulla 1 crossing 2 crossing Pyramidal decussation
general position of pyramidal decussation
2 crossing
Caudal Medulla

17. . . Cervical Spinal Cord 2 5 4 1 3 6 Position of: ventral
corticospinal, vestibulospinal,
& reticulospinal tracts
ventral horn
with LMN 5
lateral corticospinal
& rubrospinal tracts
lateral corticospinal tract
+ rubrospinal tract 4 1 3
medial & lateral
motor nuclei in
ventral horn
ventral corticospinal, vestibulo-
spinal, & reticulospinal tracts 6 . .
Cervical Spinal Cord

18. What is the ~location of the: Corticospinal Fibers?
Corticobulbar fibers – go to genu of internal capsule
What is the ~location of the:
Corticospinal Fibers?
Corticobulbar Fibers?
Rostral Midbrain Level

19. What is the ~location of the: Corticobulbar Fibers?
Red
Nucleus
Corticospinal
Fibers
Occulomotor Nucleus
Nerve
Corticobulbar fibers
What is the ~location of the:
Corticobulbar Fibers?
Corticospinal Fibers?
Red Nucleus?
Oculomotor Nucleus & Nerve?
Rostral Midbrain Level

20. Trochlear Nucleus – fibers from FEF via Premotor Area
Corticospinal
Fibers
Corticobulbar
fibers
What is the ~location of the:
Corticobulbar Fibers?
Corticospinal Fibers?
Trochlear Nucleus?
Caudal Midbrain Level

21. Trochlear nerve exit
PAG
Corticospinal and corticobulbar fibers mixed
What is the ~location of the:
Corticobulbar & Corticospinal Fibers?
PAG?
Trochlear Nerve?
Rostral Pons Level

22. Trigeminal Main Motor Nucleus
Supplies muscles of
mastication
Reticular Formation
Corticospinal and corticobulbar fibers mixed
What is the ~location of the:
Corticobulbar & Corticospinal Fibers?
Trigeminal Motor Nucleus?
Reticular Formation?
Rostral Pons Level

23. Abducens Nucleus
Facial Nerve Fibers
Reticular Formation
Corticospinal and corticobulbar fibers mixed
What is the ~location of the:
Corticobulbar & Corticospinal Fibers?
Facial Nerve Fibers?
Abducens Nucleus?
Reticular Formation?
Rostral Medulla Level

24. Hypoglossal Nerve Roots & Nucleus
Vestibular Nuclei
MLF
Reticular Formation
Pyramid
What is the ~location of the:
Pyramid?
MLF?
Vestibular Nuclei?
Reticular Formation?
Hypoglossal Nucleus & Nerve Roots?
Rostral Medulla Level

25. Lateral Corticospinal tract
Rubrospinal
Tract
Lateral Motor nuclei
Lateral Vestibulospinal
tract
What is the ~location of the:
Lateral Corticospinal Tract?
Medial Motor nuclei
Rubrospinal Tract?
Lateral Motor Nuclei
Lateral Vestibulospinal Tract?
Medial Motor Nuclei
Lumbar Level

26. Lateral Corticospinal tract
Rubrospinal
Tract
Anterior Corticospinal tract
Medial Motor nuclei
What is the ~location of the:
Lateral Corticospinal Tract?
Rubrospinal Tract?
Medial Motor Nuclei
Anterior Corticospinal Tract?
Thoracic Level

27. Lateral Corticospinal tract
Rubrospinal
Tract
What is the ~location of the:
Lateral Corticospinal Tract?
Rubrospinal Tract?
C7 Level