Summary
Natural head movements in alert, unrestrained cats were studied using video-filming, videofluoroscopy and electromyographic (EMG) recording methods. In each cat, up to sixteen neck muscles or neck-muscle compartments were implanted with recording electrodes. Patterns of muscle recruitment were examined during systematically-selected behavioral epochs in which the cat held a range of stationary postures, and when it performed volitional and exploratory behaviors such as flexion-extension or turning, grooming, eating, or headshaking. Patterns of muscular activity were interpreted with reference to simultaneous video images of head and neck movements. In separate, videofluoroscopic analysis, flexion-extension movements were examined to gain insight into the underlying movements of the skull and cervical vertebrae. These and other movements were found commonly to depend upon changes in joint angles between lower as well as upper cervical joints. Stationary postures in which the neck was held vertically were consistently associated with tonic EMG activity in only two long dorsal muscles, biventer cervicis and occipitoscapularis. Less consistent activity was also present in dorsal intervertebral muscles crossing lower cervical joints. When the neck was held horizontally, the long dorsal muscles increased their EMG activity and moderate activity was also recorded in deeper intervertebral and suboccipital muscles. When flexion-extension occurred around upper cervical joints, greatest activity was recorded in rectus capitis posterior and complexus, but when it involved the lower cervical joints, large changes in EMG activity could also be detected in biventer cervicis, occipitoscapularis, and the intervertebral muscles crossing lower cervical joints. During specialized, sagittal-plane movements such as grooming, well-defined patterns of synergy could be recognized that varied according to the degree of involvement of upper and lower cervical joint-sets. Movements in the horizontal plane were associated with EMG activity in a largely different subset of neck muscles including splenius, longissimus capitis and obliquus capitis inferior. The levels of EMG activity during flexion-extension or turning movements were much lower than those observed during other more vigorous behaviors, such as head shaking. Some neck muscles, such as clavotrapezius and sternomastoideus, could only be recruited during forceful or ballistic head movements. Results showed that the patterns of muscular activation were linked not only to the speed and trajectory of the movements of the skull, but also to the kinematics of the motion occurring across different parts of the cervical column.
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Abbreviations
- BC:
-
biventer cervicis
- CM:
-
complexus
- CT:
-
clavotrapezius
- CTV:
-
centrotransversarius
- LC:
-
longissimus capitis
- LCe:
-
longissimus cervicis
- LS:
-
levator scapulae
- OCI:
-
obliquus capitis inferior
- OCS:
-
obliquus capitis superior
- OS:
-
occipitoscapularis
- RCA:
-
rectus capitis anterior
- RCP:
-
rectus capitis posterior
- RH:
-
rhomboideus
- SD:
-
spinalis dorsi
- SM:
-
sternomastoideus
- SP:
-
splenius
- SSC:
-
semispinalis cervicis
References
Akaike N, Ohno T, Tsubokawa H (1989) EMG activities of neck muscles underlying lateral flexion of the neck during head-turning induced by electrical stimulation of the caudate nucleus in cats. Neurosci Res 6:397–410
Anderson ME (1977) Segmental reflex inputs to motoneurons innervating dorsal neck musculature in the cat. Exp Brain Res 28:175–187
Bak MJ, Loeb GE (1979) A pulsed integrator for EMG analysis. Electroenceph Clin Neurophysiol 47:738–741
Baker J, Goldberg J, Peterson B (1985) Spatial and temporal response properties of the vestibulocollic reflex in decerebrate cats. J Neurophysiol 54:733–754
Baker J, Wickland C (1988) Kinematic properties of the vestibulocollic reflex. In: Peterson BW, Richmond FJ (eds) Control of head movement. Oxford University Press, New York, pp 167–177
Brink EE (1988) Segmental organization of the upper cervical cord. In: Peterson BW, Richmond FJ (eds) Control of head movement. Oxford University Press, New York, pp 76–89
Brink EE, Suzuki I (1987) Recurrent inhibitory connexions among neck motoneurones in the cat. J Physiol (London) 383:301–326
Crouch JE (1969) Text-atlas of cat anatomy. Lea and Fibiger, Philadelphia, pp 80–94
De Waele C, Graf W, Vidal P-P (1987) Biomechanical constraints limit the numbers of degrees of freedom of the vertebrate headneck ensemble: its consequences for the postural syndrome following hemilabyrinthectomy. Soc Neurosci Abstr 13:1225
Denise P, Darlot C, Wilson VJ, Berthoz A (1987) Modulation by eye position of neck-muscle contraction evoked by electrical labyrinthine stimulation in the alert cat. Exp Brain Res 67:411–419
Engberg I, Lundberg A (1969) An electromyographic analysis of muscular activity in the hindlimb of the cat during unrestrained locomotion. Acta Physiol Scand 75:614–630
Graf W, de Waele C, Vidal PP (1991) Skeletal geometry in vertebrates and its relation to the vestibular end organs. In: Berthoz A, Graf W, Vidal PP (eds) The head-neck sensory-motor system. Oxford University Press, New York (in press)
Guitton D, Crommelinck M, Roucoux A (1980) Stimulation of the superior colliculus in the alert cat. I. Eye movements and neck EMG activity evoked when the head is restrained. Exp Brain Res 39:63–73
Guitton D, Douglas RM, Volle M (1984) Eye-head coordination in cats. J Neurophysiol 52:1030–1050
Henneman E, Mendell LM (1981) Functional organization of motoneuron pool and its inputs. In: Brooks VB (ed) Handbook of physiology, Sect 1, Vol II, Part 1. The nervous system: motor control. Am Physiol Soc, Bethesda, pp 423–509
Hoffer JA, Loeb GE, Marks WB, O'Donovan MJ, Pratt CA, Sugano N (1987) Cat hindlimb motoneurons during locomotion. I. Destination, axonal conduction velocity and recruitment threshold. J Neurophysiol 57:510–529
Kapandji IA (1974) The physiology of the joints. III. The trunk and the vertebral column (2nd edn). Churchill Livingstone Press, Edinburgh London New York
Loeb GE, Gans C (1986) Electromyography for experimentalists. University of Chicago Press, Chicago
Loeb GE, Yee WJ, Pratt CA, Chanaud CM, Richmond FJR (1988) Cross-correlation of EMG reveals widespread synchronization of motor units during some slow movements in intact cats. J Neurosci Methods 21:239–249
Panjabi MM, White AA, Brand RA (1974) A note on defining body parts configurations. J Biomech 7:385–387
Pellionisz AJ, Peterson BW (1988) A tensorial model of neck motor activation. In: Peterson BW, Richmond FJ (eds) Control of head movement. Oxford University Press, New York, pp 178–186
Penning L (1968) Functional pathology of the human spine. Excerpta Medica Foundation, Amsterdam
Peterson BW, Keshner EA, Banovetz J (1989) Comparison of neck muscle activation patterns during head stabilization and voluntary movements. Prog Brain Res 80:363–371
Reighard J, Jennings HS (1963) Anatomy of the cat. Holt Rinehart and Winston, New York
Richmond FJR, Abrahams VC (1975) Morphology and enzyme histochemistry of dorsal muscles of the cat neck. J Neurophysiol 38:1313–1321
Richmond FJR, Armstrong JB (1988) Fiber architecture and histochemistry in the cat neck muscle, biventer cervicis. J Neurophysiol 60:46–59
Richmond FJR, Gordon DC, Loeb GE (1991) Heterogeneous structure and function among intervertebral muscles. In: Graf W, Berthoz A, Vidal PP (eds) The head-neck sensory-motor system. Oxford University Press, New York, pp 101–103
Richmond FJR, Loeb GE, Reesor D (1985) Electromyographic activity in neck muscles during head movement in the alert unrestrained cat. Soc Neurosci Abstr 11:83
Richmond FJR, Scott DA, Abrahams VC (1978) Distribution of motoneurons to the neck muscles, biventer cervicis, splenius and complexus in the cat. J Comp Neurol 181:451–464
Richmond FJR, Thomson DB, Loeb GE (1990) Organization of natural head and neck movements in the cat. First World Congress of Biomechanics, I:192
Richmond FJR, Vidal PP (1988) The motor system: joints and muscles of the neck. In: Peterson BW, Richmond FJ (eds) Control of head movement. Oxford University Press, New York, pp 1–21
Rose PK (1981) Distribution of dendrites from biventer cervicis and complexus motoneurons stained intracellularly with horseradish peroxidase in the adult cat. J Comp Neurol 181:451–464
Rose PK, Keirstead SA (1988) Cervical motoneurons. In: Peterson BW, Richmond FJ (eds) Control of head movement. Oxford University Press, New York, pp 37–48
Roucoux A, Crommelinck M, Decostre M-F (1989) Neck muscle activity in eye-head coordinated movements. Prog Brain Res 80:351–362
Selbie WS, Thomson DB, Richmond FJR (1991) Sagital plane motion of the cat cervical spine. Can J Physiol Phamacol 69:Axxx
Slipjer EJ (1946) Comparative biologic-anatomical investigations on the vertebral column and spinal musculature of mammals. Kon Ned Wet Verh (Tweede Sectie) 42:1–128
Smith JL, Hoy MG, Koshland GF, Phillips DM, Zernicke RF (1985) Intralimb coordination of the paw-shake response: a novel mixed synergy. J Neurophysiol 54:1271–1281
Suzuki I, Timerick SJB, Wilson VJ (1985) Body position with respect to the head or body position in space is coded by lumbar interneurons. J Neurophysiol 54:123–133
Vidal PP, Graf W, Berthoz A (1986) The orientation of the cervical vertebral column in unrestrained awake animals I Resting position. Exp Brain Res 61:549–559
Vidal PP, Roucoux A, Berthoz A (1982) Horizontal eye position-related activity in neck muscles of the alert cat. Exp Brain Res 46:448–453
White AA, Panjabi MM (1978) Clinical biomechanics of the spine. JB Lippincott, Philadelphia
Wickland CR, Baker JF, Peterson BW (1991) Torque vectors of neck muscles in the cat. Exp Brain Res 84:649–659
Wilson VJ, Maeda, M (1974) Connections between semicircular canals and neck motoneurons in the cat. J Neurophysiol 37:346–357
Wilson VJ, Precht W, Dieringer N (1983) Responses of different compartments of cat's splenius muscle to optokinetic stimulation. Exp Brain Res 50:153–156
Winters JM, Peles JD (1990) Neck muscle activity and 3-D head kinematics during quasi-static and dynamic tracking movements. In: Winters JM, Woo SL-Y (eds) Multiple muscle systems: biomechanics and movement organization, Springer, New York, pp 461–480
Zajac FE (1989) Muscle and tendon: properties, models, scaling and application to biomechanics and motor control. Crit Rev Biomed Eng 17:359–411
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Richmond, F.J.R., Thomson, D.B. & Loeb, G.E. Electromyographic studies of neck muscles in the intact cat. Exp Brain Res 88, 41–58 (1992). https://doi.org/10.1007/BF02259127
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DOI: https://doi.org/10.1007/BF02259127