Page 338 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

A. Events from decision to move C. Descending motor tracts
to execution of movement SMA M1 (area4)
1 Decision Associative (area6, S1 (areas1–3)
cortex medial) Area5 and7
Cortical and PMA
subcortical (area6,
motivation lateral)
areas Somato-
“I want sensory Cortex
the ball” function
1a Impulse to move
Internal
capsule
“Here’s how
to get it” Motor System I
1b Strategy Hearing
Vision Tracts to
Pyramidal tract - Striatum (some x)
2 Programming Area6 - Thalamus (some x)
- Red nucleus (x)
Area4
- Pons
“Here’s the Pons - Olive
program” - Reticular Plate 12.8
formation (some x)
Cortico-
(participating muscles, bulbar
temporal sequence, tract
strength of contraction)
Basal Cere-
ganglia bellum To
Motor nuclei cuneatus
cortex Basal and gracilis (x) Pyramidal
ganglia decussation
x=decussate
Lateral cortico-
spinal tract (x) Ventral cortico-
spinal tract
Spinal cord
α and γ motoneurons
Cerebellum Motor and interneurons
thalamus
B. Somatotopic organization of prim-
3 Command to move Sensory ary motor area (M1) of the cortex
feedback
(After V.B. Brooks)
“Now do it!”
Reflex systems,
motoneurons
4 Execution of movement
Tongue
Photo: M. Jeannerod 325
Throat

Despopoulos, Color Atlas of Physiology © 2003 Thieme
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