The atlanto-axial joint is a joint in the upper part of the neck between the first and second cervical vertebrae (the atlas and axis). This joint is a pivot joint; it allows for rotation, flexion, extension, and other movements that our necks can perform.

The atlanto-occipital joint is located between the atlas and the occipital bone and allows the head to nod up and down on the vertical column. The dens acts as a pivot that allows the head to pivot right and left. The alar ligaments check excessive rotation of the head and atlas relative to the axis and the atlanto-axial joint allows the axis and atlas to articulate with one another.

Lambda: where the lambdoidal and sagittal sutures meet

Inion: the internal occipital protuberance

Pterion: meeting of the great wing of the sphenoid and parietal bone

Asterion: meeting of the lambdoidal, occipitomastoid, and parietomastoid sutures

A shoulder dislocation occurs when the humeral head is removed from the glenoid fossa. The clavicle and coracoacromial ligament are located superior to the joint, preventing superior dislocation, and the body o the scapula is posterior to the joint, preventing posterior dislocation. Most commonly, the humeral head is pushed forward and downward. There is the least resistance to dislocation in the anterior and inferior directions; though glenohumeral dislocation can occur in other orientations, these are far less common.

The axillary nerve travels through the quadrangular space with the posterior circumflex humeral artery, and can be damaged due to trauma of the upper extremity, particularly anterior-inferior shoulder dislocations. When the dislocation is reduced, placement of the humeral head can displace or damage the nerve if done improperly.

The joints between the metacarpals and phalanges in the hand are classified as diarthrosis (allows full motion), synovial (encased in a capsule filled with synovial fluid, true of all diarthrosis joints by default), and condyloid (ovoid in shape, sometimes received into an elliptical cavity).

The cuboid-metatarsal joint is a joint that connects the cuboid bone to the metatarsals, and is not generally considered part of the three major ankle joints. Instead, it is generally classified as a joint in the foot.

The subtalar joint, also called the talocalcaneal joint, is a condyloid (plane synovial) joint that allows for the inversion/eversion mechanism of the foot, but not dorsiflexion or plantarflexion. It is sometimes combined with the navicular joint to form the talocalcaneonavicular joint when considering the motion of the whole ankle.

The ulna is not part of the radiocarpal joint—if it were, the forces acting on the joint would prevent proper flexion and extension, limiting hand mobility and causing excessive damage from counterforces caused by the radius. Instead, a thin fibrocartiliginous ligament called the articular disk sits between the distal end of the ulna and the radiocarpal joint, allowing for a smooth, concave surface on the proximal side of the joint.

The glenoid cavity of the scapula is the place of articulation between the scapula and the humerus. The acromion and coracoid process are not sites of joint articulation and the olecranon is not found on the scapula, but on the ulna.