These are the semispinalis capitis, the semispinalis cervicis and the semispinalis thoracis.
2.
The semispinalis cervicis is thicker than the semispinalis thoracis.
3.
The "'semispinalis thoracis "'( or " semispinalis dorsi " ) muscle consists of thin, narrow, fleshy fasciculi, interposed between tendons of considerable length.
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