Subcostalis muscle

Subcostalis muscle is a muscle that is part of the human anatomy. It is located in the thoracic region of the body, specifically in the posterior thoracic wall. The muscle is also known as the subcostal muscle.

Etymology

The term "subcostalis" is derived from the Latin words "sub" meaning under and "costa" meaning rib. Therefore, the term can be translated to mean "under the rib".

Anatomy

The subcostalis muscle is a thin, triangular muscle. It is located in the lower part of the thoracic region, beneath the 12th rib. The muscle originates from the inner surface of one rib and inserts into the inner surface of the second or third rib below. The muscle fibers run in a downward and lateral direction.

The subcostalis muscle is innervated by the intercostal nerves, specifically the thoracic spinal nerves. It is supplied by the intercostal arteries and veins.

Function

The primary function of the subcostalis muscle is to assist in respiration. During inspiration, the muscle contracts, elevating the ribs and increasing the volume of the thoracic cavity. During expiration, the muscle relaxes, allowing the ribs to depress and decrease the volume of the thoracic cavity.

Clinical significance

Due to its location and function, the subcostalis muscle can be affected by various medical conditions. These include muscle strain, intercostal neuralgia, and rib fracture. Treatment for these conditions often involves rest, pain management, and physical therapy.

Related terms

• Intercostal muscles
• Thoracic wall
• Respiration (physiology)

See also

• List of muscles of the human body

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