Semispinalis

Semispinalis is a group of muscles located within the human body. They are part of the transversospinales muscle group, which is a collection of muscles that are situated deeply in the back and spine. The semispinalis muscles are further divided into three parts: semispinalis capitis, semispinalis cervicis, and semispinalis thoracis.

Anatomy

The semispinalis capitis is the largest and most superficial of the three semispinalis muscles. It is located in the back of the neck, extending from the base of the skull to the neck and upper back. It plays a crucial role in extending and rotating the head.

The semispinalis cervicis is located in the neck, beneath the semispinalis capitis. It extends from the upper thoracic and lower cervical vertebrae to the axis, which is the second cervical vertebra. This muscle assists in extending and rotating the neck.

The semispinalis thoracis is the smallest and deepest of the three semispinalis muscles. It is located in the upper back, extending from the lower thoracic vertebrae to the upper thoracic and lower cervical vertebrae. This muscle helps in extending and rotating the upper back.

Function

The semispinalis muscles play a significant role in maintaining posture and performing movements of the head and vertebral column. They are responsible for the extension of the head and vertebral column, rotation to the opposite side, and lateral flexion.

Clinical significance

Injury or strain to the semispinalis muscles can result in pain and limited movement. Treatment typically involves rest, physical therapy, and in some cases, surgery.

See also

• List of muscles of the human body
• Spinalis
• Longissimus

References

Semispinalis Resources
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