Innermost intercostal muscle
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Innermost intercostal muscle

Innermost intercostal muscle is a layer of intercostal muscles deep to the plane that contains the intercostal nerves and intercostal vessels and the internal intercostal muscles. Origin: Infero-posterior border of each rib (above). Insertion: Supero-posterior border of the rib (below). Nerve supply: intercostal nerves. Blood Supply: Actions: Through adduction of upper ribs to the lower…

Obliquus capitis inferior muscle
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Obliquus capitis inferior muscle

Obliquus capitis inferior muscle Anatomy One of the four suboccipital muscles is the obliquus capitis inferior muscle. The largest muscle of the four is obliquus capitis inferior, which is grouped with the rectus capitis posterior major, rectus capitis posterior minor, and obliquus capitis superior muscles. By supporting the atlantoaxial joint, obliquus capitis inferior helps to…

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Obliquus capitis superior muscle

Obliquus capitis superior muscle is a small muscle in the upper back part of the neck and is one of the suboccipital muscles and part of the suboccipital triangle. origin: Lateral mass of atlas. Insertion : Lateral half of the inferior nuchal line Nerve: Suboccipital nerve. Actions: Extends head and flex head to the ipsilateral…

Semispinalis Muscles
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Semispinalis Muscles

Semispinalis Muscle Anatomy a group of three muscles belonging to the transversospinales. These are the semispinalis capitis, the semispinalis cervicis, and the semispinalis thoracis. Origin Cervical region: made up of seven vertebrae in the neck (C1-C7)  The thoracic region: is made up of twelve vertebrae between the neck and lower back (T1-T12) Insertion The semispinalis…

Rectus capitis posterior major muscle
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Rectus capitis posterior major muscle

Rectus capitis posterior major muscle Anatomy arises by a pointed tendon from the spinous process of the axis, and, becoming broader as it ascends, is inserted into the lateral part of the inferior nuchal line of the occipital bone and the surface of the bone immediately below the line. origin : Spinous process of the…

Rectus capitis posterior minor muscle
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Rectus capitis posterior minor muscle

Rectus capitis posterior minor muscle Anatomy arises by a narrow pointed tendon from the tubercle on the posterior arch of the atlas, and, widening as it ascends, is inserted into the medial part of the inferior nuchal line of the occipital bone and the surface between it and the foramen magnum, and also takes some…