Nodding of the head as a person falls asleep sitting up involves primarily the muscles of (the)

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Quizplus · Accepted Answer

Nodding of the head as a person falls asleep sitting up involves primarily the muscles of the capitis (head) and cervicis (neck) regions, as these are the muscles responsible for maintaining head posture and movement. The upper limb and pectoral girdle are not directly involved in this movement, and while the thoracis region may contribute to overall posture, it is not the primary region involved in head nodding during sleep.

Nodding of the Head as a Person Falls Asleep Sitting