Appendages like arms and legs have their own skeletal system to support movement and stability. The pectoral girdle supports the arms and includes the clavicles and scapulae, which lead to the humerous, radius, ulna, carpals, metacarpals, and phalanges of the arm and hand. The pelvic girdle forms a similar anchoring structure for the legs and includes the coxal bones/coxae, illium, ischium, and pubis. Females typically have have a wider-angled pubis than males to accommodate childbirth. These connect to the femur, patella (kneecap), tibia, fibula, tarsals, metatarsals, and phalanges of the feet.
The appendicular skeleton includes the pectoral girdle, arm bones, pelvic girdle, and leg bones
The pectoral girdle contains the clavicles (collarbones) and scapulae (shoulder blades)
The arm bones include the humerus, radius, ulna, carpals, metacarpals, and phalanges
The pelvic girdle is made up of coxal bones (each one with an ilium, and ischium, and pubis)
Male and female pelvises tend to differ because of the pubic arch
The leg bones include the femur, patella, tibia, fibula, tarsals, metatarsals, and phalanges
Did you know…
Q: Why are clavicles necessary in the pectoral girdle?
A: They help stabilize the upper chest by articulating the humerus and scapula with the thoracic cage. Yes, they are important and that is realized when you fracture one or both clavicles! I have seen video footage of a boy who was born without clavicles and he is extra flexible with respect to how he can move his shoulders around. He can actual touch his shoulders together in front of his chest (if you can imagine that) and he can squeeze through areas that most humans his size could not!
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
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