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Lamina IV-VI neurones of the second sacral segment projecting to the sixth cervical segment of the cat's spinal cord

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Mrowczynski W.

Acta Neurobiologiae Experimentalis

1997

vol. 57

issue 3

189-195

Cervical projections of neurones located in the second sacral segment of the spinal cord were electrophysiologically investigated in 12 adult cats under alpha-chloralose anaesthesia. Extracellular or intracellular antidromic potentials from 41 neurones following stimulation of their axons in the spinal grey matter in the C6 segment brought evidence of sacro - cervical connections. Cell bodies of the investigated neurones were found mainly in the medial part of laminae IV, V and VI. Axons of these neurones ran in lateral funiculi, mostly in their dorsal parts (dlf). Most of the axons (26) ascended bilaterally. Fibres of 15 cells ran unilaterally - on the ipsilateral (13) or the contralateral side (2). Conduction velocites of axons measured between S2 and C6 segments were in the range from 38.4 to 69.1 m/s. It is suggested that these neurones may play an important role in movement coordination between hindlimbs and forelimbs.

Projections of laminae IV-VI neurones located in the S2 segment of the spinal cord to the C6 segment and the cerebellum in the cat

100%

Mrowczynski K., Grottel K., Krutki P.

issue 2

103-111

Ascending projections of neurones of the second sacral segment (S2) of the spinal cord to the sixth cervical segment (C6) and to the cerebellum were electrophysiologically investigated in eight adult cats under alpha-chloralose anaesthesia. Antidromic potentials recorded from 44 neurones following stimulation of their axons in the grey matter of the C6 segment as well as in the contralateral restiform body (coRB) showed evidence of both supraspinal and propriospinal projections. About one third of neurones (15) ascended to the cerebellum through the coRB and gave off collaterals to the C6 segment, while the rest (29) terminated exclusively at the level of the C6 segment. The cell bodies were found mainly in central parts of Rexed's laminae IV, V and VI while axons ran in lateral funiculi. Axonal conduction velocities measured between S2 and C6 segments were in the range of 42-78 m/s. A decrease of conduction velocity above the Th13 and C6 segments was found in most axons suggesting that they give some collaterals at spinal as well as supraspinal levels.

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2 Acta Neurobiologiae Experimentalis

1 1998

1 1997

1 Grottel K.

1 Krutki P.

1 Mrowczynski K.

1 Mrowczynski W.

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Lamina IV-VI neurones of the second sacral segment projecting to the sixth cervical segment of the cat's spinal cord

Projections of laminae IV-VI neurones located in the S2 segment of the spinal cord to the C6 segment and the cerebellum in the cat