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G ..-,

Post SPft)Cereoeiar

i:!a

Trac1

CortiooSPlflai

RubrOlf)lnal Tract

An1

Spmocerebellar Tracl

HomofGrayMaMIW

vestibulospinal Trac1

s.cr.I AnI SPInothalamIC Tract

Ant. COrticospinal Tract

DESCENDING

ASCENDING

PATHWAYS

PATHWAYS

Figure 4-5. Cross-section of the spinal cord. (Ant. :; anterior; Lat. :; lateral; Post. :; posterior.) ( With permission from RJ Love, we Webb ledsl. Neurology for the Speech· Language Pathologist 14th edl. Bosto", BuHerlVorth-Hei"ema"". 2001 ;44.) z

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276 AClITE CARE HANDBOOK FOR PHYSICAL THERAPISTS

Table 4-6. Major Ascending and Descending White Maner Tracts""

Tract

Function

Fasciculus

Sensory pathway for lower-extremiry and lower-trunk joim

gracilis

proprioception, vibration, two-poim discrimination,

graphesrhesia, and double simultaneous stimulation

Fasciculus

Sensory pathway for upper-extremiry, upper-crunk, and

cuneatus

neck joint proprioception, vibration, two-point discrimination, graphesthesia, and double simulraneous

stimulation

Laceral

Sensory pathway for pain, temperature, and light touch

spinothalamic

Ventral

Sensory pathway for ipsilateral subconscious proprioception

spinocerebellar

Dorsal

Sensory pathway for ipsilateral and contralateral subconspinocerebellar

scious proprioception

Lateral

Motor pathway for contralateral voluntary fine muscle

corticospinal

movement

(pyramidal)

Anterior

Motor pathway for ipsilateral voluntary movement

corticospinal

(pyramidal)

Rubrospinal

Motor pathway for gross postural tone

(extrapyramidal)

Tectospinal

Mocor pathway for contralateral gross postural muscle

(extracone associated with auditory and visual stimuli

pyramidal)

Vestibulospinal

Motor pathway for ipsilateral gross postural adiustments

(extraassociated with head movemenrs

pyramidal)

"Sensory tracts ascend from the spinal cord; motor tracts descend from (he brain (0 the

spinal cord.

Sources: Data from S Gilman, SW Newman (cds). Mamer and Gatt's Essenrials of Clinical Neuroanatomy and Neurophysiology (7th ed). Philadelphia: FA Davis, 1989; and EN Marieb (cd). Human Anatomy and Physiology (5th cd). San Francisco: Benjamin

Cummings, 2001.