The pelvis
The upper arm is the humerus, the lower arm is made up of the radius and ulna. The joint connecting the upper is called the humeroulnar joint.
The lower structure of humans is called the pelvis. It is a bony structure located between the abdomen and the legs, consisting of the hip bones, sacrum, and coccyx. It provides support and stability for the upper body and connects the spine to the legs.
Scoliosis is a condition characterized by an abnormal lateral curvature of the spine. It can occur at any level of the spine, including the cervical (neck), thoracic (upper back), and lumbar (lower back) regions. The most common location for scoliosis is the thoracic spine, which is the upper and middle part of the back.
I think you met joints, and the joints are the upper joint and the lower joint. The order of clarinet peices from the top is mouthpiece, barrel, upper joint, lower joint, bell.
Marfan patients may develop kyphosis either in the upper (thoracic) spine or the lower (lumbar) spine.
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The spine, rib cage, and shoulder blades are the main bones that support the upper body. They provide structure and protection for vital organs and help with movement and posture.
The brainstem is the structure that links the upper and lower centers of the brain. It connects the cerebrum (upper brain) to the spinal cord (lower brain) and is responsible for basic life functions such as breathing, heartbeat, and blood pressure regulation.
Hip bone transfer the weight of the upper body into the legs, by connecting spine to the lower limbs
The lower trapezius muscle inserts on the spine of the scapula, which is located on the upper back of the human body.
The three main divisions of the spinal column are the cervical spine near the neck, the thoracic region of the upper back, and the lumbar spine in the lower back.
Because your upper jaw is part of your skull which is connected to your spine and your lower jaw is connected to your upper jaw by a hinge type joint that allows you to move your lower jaw so that we can eat. So therefore we cannot move our upper jaw because that would require moving our head which would move our lower jaw too.