Kerelihaste

Kerelihaste is a term used in some texts to describe the muscle system of the torso that stabilizes the spine and pelvis during movement. It is not part of standard anatomy nomenclature; in modern anatomy the term "core muscles" is more common.

Anatomy and components: Deep core muscles include the transversus abdominis and internal obliques; the posterior core comprises the multifidus and erector spinae; the pelvic floor and the diaphragm form the boundary of the cavity. Together they stabilize the trunk and regulate intra-abdominal pressure.

Function: Kerelihaste provides spinal stability, controls pelvic motion, and enables efficient force transfer between the upper and lower body. It supports posture during static and dynamic tasks, and contributes to breathing patterns when the diaphragm and abdominal muscles coordinate.

Clinical relevance: In health and sport, kerelihaste function is assessed in core stability tests and trained through progressive stabilization exercises. Impairment or imbalance may contribute to low back pain or reduces performance; rehabilitation emphasizes timing, coordination, and endurance of the core muscles.

History and usage: The term is used variably and is not universally adopted in anatomy textbooks. It overlaps with the broader concept of core or trunk muscles, and is often employed in physiotherapy and athletic training to describe a functional muscle group rather than a single muscle.