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The human leg is the entire lower extremity or limb [ 1 ] [ 2 ] of the human body , including the foot , thigh and even the hip or gluteal region; however, the precise definition in human anatomy refers [ 3 ] [ 4 ] [ 5 ] only to the section of the lower limb extending from the knee to the ankle . Legs are used for standing , walking , jumping , running , kicking , and similar activities, and constitute a significant portion of a person's mass. [ edit ] Anatomy
The stomach is a muscular , hollow, dilated part of the digestion system which functions as an important organ of the digestive tract in some animals , including vertebrates , echinoderms , insects (mid-gut), and molluscs .
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The sole is the bottom of the foot . In humans the sole of the foot is anatomically referred to as the plantar aspect .
A neutral spine or good posture refers to the "three natural curves [that] are present in a healthy spine ." [ 1 ] From the anterior / posterior view the 33 vertebrae in the spinal column should appear completely vertical. From the sagittal view, the cervical region of the spine (C1-C7) is convex anteriorly, the thoracic region (T1-T12) is convex posteriorly, and the lumbar region (L1-L5) is convex anteriorly. The sacrum (S1-S5 fused) and coccyx (on average 4 fused) rest between the pelvic bones . [ 2 ] A neutral pelvis indicates the anterior superior iliac spines and pubic symphysis fall in the same vertical line. [ 3 ]
Human body proportions change with age
An MRI scan of the head.