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…
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…
Salpingopharyngeus Muscle Anatomy The salpingopharyngeus muscle is a thin and elongated muscle located in the pharyngeal region of the human body. It is a component of the pharyngeal constrictor muscle group, which is essential to swallowing. Origin: Insertion: Nerve: Blood Supply The pharyngeal branch of the ascending pharyngeal artery, the larger palatine artery, and the…
External abdominal oblique Muscle Anatomy The external abdominal oblique is a paired muscle located on the lateral sides of the abdominal wall. Along with the internal abdominal oblique and transversus abdominis, it comprises the lateral abdominal muscles. Origin The external abdominal oblique muscle originates from the external surfaces of ribs 5-12. The attaching fibers interdigitate…
Rhomboid Minor Muscle Anatomy The Rhomboid minor is a small skeletal muscle on the back that connects the scapula with the vertebrae of the spinal column. Along with the Rhomboid major, it keeps the scapulae pressed against the thoracic wall. Origin It originates from, Insertion It inserts into a small area of the medial border…
