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Anterior corticospinal tract

Figure

Major ascending and descending tracts within a cross section of the spinal cord. Ascending tracts are in orange, descending tracts in tan. (Tracts are shown only on one side.)

Sensory cortex of cerebrum

Sensory cortex of cerebrum

Spinothalamic Tract Cross Over

Thalamus

Spinothalamic tract

Fasciculus cuneatus tract

Sensory impulse from skin temperature, touch or pain receptors

Figure

Sensory impulses originating in skin touch receptors ascend in the fasciculus cuneatus tract and cross over in the medulla of the brain. Pain and temperature information ascends in the lateral spinothalamic tract, which crosses over in the spinal cord.

Thalamus

Spinothalamic tract

Fasciculus cuneatus tract

Spinal cord

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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