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The lower extremity of the radius actually has two bones which it articulates with. The carpal and the ulna.
your arms are the upper limbs and your legs are the lower limbs :)
The appendicular divison (126 bones) consist of the pectoral girdle, upper limbs, pelvic girdle, and lower limbs.
Because they have evolved (or were designed, whichever you choose to believe) as to be the primary weight bearing limbs, so they have to be more sturdy to do that job than the upper limbs.
Upper limbs= Scapula, clavical, humerus, radius, ulnar, 8 carpals, 5 metacarpals and 14 phalanges Xs 2= 64. Lower limbs= Coxal, femur, patella, tibia, fibula, 7 tarsals, 5 metatarsals and 14 phalanges Xs 2= 62.
Because bones that are not subjected to weight-bearing stress lose calcium.
A human leg could be referred to as a lower extremity.
The bones that form the longitudinal axis of the body, called axial skeleton. it has 3 main parts , skull, vertebral column and the bony thorax. Appendicular skeleton consists with bones of the limbs and girdles. ( upper limbs, lower limbs, pelvic girdle and shoulder girdles)
Axial bones are those that are found within your head, vertebral (spinal) column, and ribcage. Any other bone is considered part of the appendicular skeleton; these include all bones related to the upper and lower limbs. This includes your clavicle (collarbone), scapula (shoulder blade), and pelvic bones, even though they are part of your torso (and obviously all bones that are further down in the limbs).
The function of many bones is to move things especailly in the limbs wiith the help of muscles.
The adult human body has 206 bones. The Axial skeleton, which consists of all the bones in the head, the rib cage, the hyoid bone, the sternum, and vertebral column, has 80 bones. The Appendicular skeleton, which consists of the upper and lower limbs, has 126 bones.
The four bones that form the ankle joint are the tibia, fibula, talus, and calcaneus. The tibia and fibula are the bones of the lower leg that articulate with the talus, which sits on top of the calcaneus, or heel bone.