The ankle joint (or talocrural joint) is a synovial joint located in the lower limb. It is formed by the bones of the leg and the foot – the tibia, fibula and talus. Functionally, it is a hinge type joint, permitting dorsiflexion and plantarflexion of the foot.
The shoulder joint itself known as the Glenohumeral joint, (is a ball and socket articulation between the head of the humerus and the glenoid cavity of the scapula) The acromioclavicular (AC) joint (where the clavicle meets the acromion of the scapula)
The vertebral column, also known as the backbone or spine, is part of the axial skeleton. The vertebral column is the defining characteristic of a vertebrate in which the notochord (a flexible rod of uniform composition) found in all chordates has been replaced by a segmented series of bone: vertebrae separated by intervertebral discs. The vertebral column houses the spinal canal, a cavity that encloses and protects the spinal cord.