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The trunk consists of three segments: thorax, abdomen, and [[Pelvis - Anatomy & Physiology|pelvis]], each of which is bounded by body wall and contains a cavity. The thoracic cavity lies cranial to the diaphragm, whereas the abdominal cavity lies caudal.

The trunk consists of three segments: thorax, abdomen, and [[Pelvis - Anatomy & Physiology|pelvis]], each of which is bounded by body wall and contains a cavity. The thoracic cavity lies cranial to the diaphragm, whereas the abdominal cavity lies caudal.

Dorsally, the roof of all three cavities is formed by the [[Spinal Column - Anatomy & Physiology|spinal column]] and associated muscles. The pelvic cavity is defined by the borders of the bony pelvis and communicates with the abdominal cavity. The bony thorax includes the [[Ribs and Sternum - Anatomy & Physiology|ribs and sternum]]; the [[Ribs_and_Sternum_-_Anatomy_%26_Physiology#Thoracic_Musculature|thoracic musculature]] is predominantly associated with respiration. Knowledge of the [[Ribs_and_Sternum_-_Anatomy_%26_Physiology#Abdominal_Musculature|abdominal musculature]] is important when performing surgery on abdominal organs, and these muscles are traditionally divided into ventrolateral and sublumbar groups.

Dorsally, the roof of all three cavities is formed by the [[Spinal Column - Anatomy & Physiology|spinal column]] and associated muscles. The pelvic cavity is defined by the borders of the bony pelvis and communicates with the abdominal cavity. The bony thorax includes the [[Ribs and Sternum - Anatomy & Physiology|ribs and sternum]]; the [[Ribs_and_Sternum_- Anatomy & Physiology#Thoracic_Musculature|thoracic musculature]] is predominantly associated with respiration. Knowledge of the [[Ribs_and_Sternum_- Anatomy & Physiology#Abdominal_Musculature|abdominal musculature]] is important when performing surgery on abdominal organs, and these muscles are traditionally divided into ventrolateral and sublumbar groups.

==The Head and Neck==

==The Head and Neck==