spinal tract functions

Question 1

gracilis functions

Answer 1

• vibratory
• 2 pt touch discrimination
• proprioception (conscious)

Question 2

cuneatus functions

Answer 2

• vibratory
• 2 pt touch discrimination
• proprioception (conscious)

Question 3

anterior spinothalamic AST

Answer 3

light touch; RL 3,4

Question 4

lateral spinothalamic LST

Answer 4

pain/thermal; RL 2,5

Question 5

anterior spinocerebellar ASC

Answer 5

unconscious gross movements of the lower body

Question 6

posterior spinocerebellar PSC

Answer 6

fine motor movement proprioception of lower body (unconscious) RL 7

Question 7

cuneocerebellar fx

Answer 7

fine proprioceptive movement from the shoulder girdle

Question 8

anterior corticospinal ACS (D)

Answer 8

initiate axial musculature

cerebrum

Question 9

lateral corticospinal LCS (D)

Answer 9

initiate precise, skilled voluntary movements (mainly distal ext.)

cerebrum

Question 10

tectospinal

Answer 10

• extrapyramidal postural reflex in the neck
• reflex enhancement with sight and auditory input
  muscles: TRAPEZIUS, SCM

cerebellum

Question 11

rubrospinal

Answer 11

flexor muscles of hand and foot. inhibit extension
contralateral- lesion above cord
ipsilateral- spinal cord lesion

cerebellum

Question 12

vestibulospinal

Answer 12

extensor muscles- ipsilateral postural and muscle tone; inhibits flexor muscles
-maintains proper orientation in falling

cerebellum

Question 13

reticulospinal

Answer 13

heart, BP and respiratory rates and rhythms

Question 14

fasciculus proprius

Answer 14

• vastly important coordination for spinal reflexes

- these are the first fibers to be myelinated in the fetus. early spontaneous movements here