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Figure 5: The trapezius and semispinalis capitis muscles must be differentiated from each other. Oftern, there is a midline extension of the trapezius muscle. Lateral to the midline raphe, the oblique fibers of the trapezius muscle are encountered first, followed by a layer of fascia underneath. The semispinalis muscle is deep to the trapezius and can be identified by its vertical fibers, lighter color, and bulkier appearance compared to the trapezius muscle

Figure 5: The trapezius and semispinalis capitis muscles must be differentiated from each other. Oftern, there is a midline extension of the trapezius muscle. Lateral to the midline raphe, the oblique fibers of the trapezius muscle are encountered first, followed by a layer of fascia underneath. The semispinalis muscle is deep to the trapezius and can be identified by its vertical fibers, lighter color, and bulkier appearance compared to the trapezius muscle