Bones - Anatomy

The atlas is the first cervical vertebra, because it holds up the "globe" (the head.) The second cervical vertebra is know as the axis. The other vertebrae are named based on their location within the vertebral column.

The thoracic vertebrae have facets called costal pits, with which the ribs articulate. No other types of vertebrae have this feature, nor do other types of vertebrae articulate with the ribs.

The most superior portion of the sternum is the manubrium. The body of the sternum is just inferior to the manubrium. The xiphoid process is the most inferior portion of the sternum. The clavicle and the humerus are not part of the sternum.

The middle portion of the sternum is the body of the sternum. The most superior portion of the sternum is the manubrium. The xiphoid process is the most inferior portion of the sternum. The clavicle and the humerus are not part of the sternum.

The most inferior portion of the sternum is the xiphoid. The most superior portion of the sternum is the manubrium. The body of the sternum is just inferior to the manubrium. The clavicle and the humerus are not part of the sternum.

The sternum is composed of 3 separate portions: the manubrium, the body of the sternum, and the xiphoid process.

The xiphoid is composed of cartilage in children. By adulthood, this cartilage has undergone ossification and is replaced by bone.

The clavicles insert in the most superior portion of the sternum known as the manubrium. The clavicles do not insert into the body of the sternum, the xiphoid process, the humerus, or the supraspinatus muscle.

The sternal angle separates the manubrium and the body of the sternum.

The first rib inserts on the manubrium of the sternum.

The second rib inserts at the sternal angle. The first rib inserts on the manubrium and the third through six ribs insert on the body of the sternum.

The third through sixth ribs insert at the body of the sternum. They do not insert at the manubrium, xiphoid process, clavicle, or the humerus.

The jugular notch, also known as the suprasternal notch is located at the superior portion of the manubrium. It is not located on the body of the sternum, the xiphoid process, the clavicle or the humerus.

The xiphisternal joint separates the body of the sternum and the xiphoid process. The sternal angle separates the manubrium and the body of the sternum.

The ulna is the medial bone of the forearm; it articulates with the humerus and radius. The radius is the lateral bone of the forearm. The humerus is the largest bone of the upper limb and is the only bone of the (upper) arm. The tibia is the lower leg's analog of the ulna.

The mandible is the lowest bone in the face in humans, forming the lower jaw and holding the lower teeth in place. It is commonly known as the jawbone. The manubrium is the superiormost bone in the sternum. The maxilla holds the upper teeth in place.

The frontal bone consists of a squamous, orbital, and nasal part and refers generally to the part of the body known as the "forehead"?

The dental formula for a modern human adult is 2:1:2:3 in each quadrant: two incisors, one canine, two premolars, and three molar, for a total of 32 adult teeth. There is some variation in this number, as the third molar (also known as the Wisdom Tooth) is not present in all modern human adults.

The dental formula for a modern human child is 2:1:0:2 in each quadrant: two incisors, one canine, and two molars, for a total of 20 deciduous teeth. There are no premolars in deciduous dentition.

Primary curvature is found in newborns, whereas secondary curvature develops over time. The thoracic and sacral portions of the vertebral column are convex, giving babies a more hunched posture.