Purdue Exam 2 Bio 203 Latest Edition
2025. Questions & Correct Answers.
Graded A
Anterior and lateral tracts – ANS sense crude touch, pain, temperature
cross over in spinal cord, some uncrossed
located in lateral and anterior funiculi
Corticospinal tracts – ANS originates in cerebral cortex
crosses in medulla
command fine movements of hands and digits
lesion= babinski sign
dorsal column tracts - ANSsense fine touch, vibration, pressure, etc. Cross
over in medulla and synapse in nucleus cutaneous and nucleus gracilis in
medulla
Reticulospinal, vestibulospinal tracts - ANSboth control body posture and
balance and originate in brain stem
Reticulospinal originates in reticular formation of medullla and pons
Vestibulospinal originates in vestibular nuclei
NOT CROSSED
Rubrospinal tract - ANScontrols coarse movements
originates in red nucleus of brain stem and crosses over immediately
