Transversus thoracis muscle Anaomy Transversus thoracis muscle lies internal to the thoracic cage, anteriorly. It is a thin plane of muscular and tendinous fibers, situated upon the inner surface of the front wall of the chest. On the inside surface of the anterior chest wall, there is a muscle called transversus thoracis (also known as…
Subcostalis Muscle Anatomy Subcostalis muscle are the narrow muscles that span two or three intercostal gaps and are located on the inner surface of the posterior thoracic wall. They make up the intrinsic musculature of the chest wall along with the intercostal, serratus posterior, levatores costarum, and transversus thoracis muscles. The subcostal muscles maintain the…
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…
Internal intercostal muscles are a group of skeletal muscles located between the ribs. They are eleven in number on either side. origin : Rib – superior border . Insertion : Rib – inferior border. Nerve : Intercostal nerves. Actions : Hold ribs steady
External intercostal muscles are eleven in number on both sides. origin: Lower border of ribs. Insertion : Upper border of rib below. Nerve: intercostal nerves. Actions: Inhalation.
Intercostal muscles are several groups of muscles that run between the ribs and help form and move the chest wall. The intercostal muscles are a group of muscles located between the ribs in the thoracic (chest) region. They play an important role in the respiratory system by assisting with breathing. There are three layers of…
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…
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…
Splenius Capitis Muscle Anatomy Splenius capitis muscle is a broad, straplike muscle in the back of the neck. It pulls on the base of the skull from the vertebrae in the neck and upper thorax. It is involved in movements such as shaking the head. Origin: Nuchal ligament and spinous process of C7-T3. Insertion: Mastoid…
Longissimus capitis muscle: the muscle lateral to the semispinalis muscles. It is the longest subdivision of the erector spinae muscles that extends forward into the transverse processes of the posterior cervical vertebrae. origin: The transverse processes are bony projections that stick out diagonally from the back of the vertebrae, while the articular processes are bony…
