Cremaster muscle is a muscle that covers the testis and the spermatic cord. It is a paired muscle, being one on each side of the body. The cremaster muscle develops to its full extent only in males while in females it is represented by only a few muscle loops. In female humans, the cremaster muscle…
Pyramidalis muscle is a small triangular muscle, anterior to the rectus abdominis muscle, and contained in the rectus sheath. Origin: pubic symphysis and pubic crest. Insertion: linea alba. Nerve supply: Subcostal nerve (T12). Actions: tensing the linea alba. When performed alone, the tensing of the linea alba by the pyramidalis muscle serves no important purpose….
What is Rectus abdominal muscle? The rectus abdominis muscle also called the “abdominal muscle” or sometimes the “abs muscles”, is a paired straight muscle located at the front side of the abdominal area. The Rectus abdominis muscle is two parallel muscles, which are separated by the linea alba (midline band of connective tissue). The rectus…
Transverse abdominal Muscle Anatomy The transverse abdominal muscle, often referred to as the TVA, is a crucial component of the core that lies beneath the rectus abdominis and obliques. a muscle layer of the anterior and lateral (front and side) abdominal wall which is deep to (layered below) the internal oblique muscle. It is thought…
Serratus Posterior Superior Muscle Anatomy The serratus posterior superior muscle is a thin, flat muscle located in the upper back region. Comprising a part of the intrinsic musculature of the back, the serratus posterior superior plays a crucial role in respiratory mechanics and postural support. The upper and lower back contain two paired muscles called…
Serratus Posterior Inferior Muscle Anatomy The serratus posterior inferior is one of the muscles of the back, specifically in the thoracic region. It is part of the deeper layer of muscles in the back and is situated inferior (lower) to the serratus posterior superior muscle. The serratus posterior inferior is named for its serrated or…
Levatores Costarum Muscles Anatomy Levatores costarum muscles is a twelve in number on either side, are small tendinous and fleshy bundles, which arise from the ends of the transverse processes of the seventh cervical and upper eleven thoracic vertebrae. It is located on either side of the posterior aspect of the thoracic vertebra they go…
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…
