The clavicle is an anterior bone whose sternal end articulates with the manubrium of the sternum at the sternoclavicular joint. The sternal end is also anchored to the first rib by the costoclavicular ligament. The acromial end of the clavicle articulates with the acromion of the scapula at the acromioclavicular joint.
How can you tell the difference between the Acromial and sternal end of the clavicle?
The rounded medial region (sternal region) of the shaft has a long curve laterally and anteriorly along two-thirds of the entire shaft. The flattened lateral region (acromial region) of the shaft has an even larger posterior curve to articulate with the acromion of the scapula.
What changes occur in the sternal rib end as an individual gets older?
The topography changes from a smooth and flat surface to an irregular and undulating surface, resulting from development of ridges, severe nodule or osteophyte formation. The outline of the surface also becomes irregular.
Where is sternal end located?
The sternal end (sternal extremity) of the clavicle is triangular in form, directed medialward, and a little downward and forward; it presents an articular facet, concave from before backward, convex from above downward, which articulates with the manubrium sterni through the intervention of an articular disk.
What are the ends of the clavicle?
Extremities. The orientation of the clavicle can be distinguished by its ends: a broad, flat acromial end (referred to as the lateral third); and a round pyramidal-like sternal end (referred to as the medial two-thirds).
At what age does the sternum fuse?
The calcification and the fusion of the sternebrae are usually complete by 25 years of age (6–8). Postnatal development, maturation, and ossification center development of the sternum differ significantly from person to person.
What is the bone between your breasts called?
Your sternum is a bone that’s located in the middle of your chest. It’s also sometimes referred to as the breastbone. Your sternum protects the organs of your torso from injury and also serves as a connection point for other bones and muscles.
What is thoracic vertebra?
Thoracic vertebrae are the twelve vertebral segments (T1-T12) that make up the thoracic spine. These structures have very little motion because they are firmly attached to the ribs and sternum (breastbone).
What does a lump on your clavicle mean?
Lumps found on the collarbone can be caused by a variety of things, including injury, infection, and cysts. Symptoms, treatment, and outlook vary based on the cause and severity of the lump. Anyone with a lump on their collarbone without a clear cause should speak with a doctor to get a proper diagnosis and treatment.
How is the clavicle attached?
Structure. The clavicle joins the scapula, or shoulder blade, and sternum to form two joints on either end of the bone, which are: Acromioclavicular (AC) joint: The acromioclavicular joint forms between the acromion of the scapula and clavicle at the top of the shoulder, held together by the acromioclavicular ligament.
Which end of the clavicle attaches to the sternum?
The medial end, known as the sternal end of the clavicle, has a triangular shape and articulates with the manubrium portion of the sternum. This forms the sternoclavicular joint, which is the only bony articulation between the pectoral girdle of the upper limb and the axial skeleton.
What happens to the 4th rib’s sternal end over time?
At the start the sternal end is flat or billowy with regular and rounded edges, and over time its rim thins and become irregular, with the surface porosity increasing, and the end becomes irregular.
Which is the most important age indicator of human body?
Measuring the length of long bones can give an estimate of age for children, but this technique is useful only until bones have stopped growing. The tibia completes growth at about age 16 or 17 in girls, and 18 or 19 in boys. For toddlers to teenagers up to age 21, teeth are the most accurate age indicators.
How can you tell how old bones are?
The carbon-14 it contains, though, continues to decay, while the amount of normal carbon-12 remains the same. Scientists can then compare the ratio of normal carbon (carbon-12) to radioactive carbon-14 to determine an approximate age of the creature by testing and analyzing its ancient, fossilized bones.
What organs are behind sternum?
The thymus is a small organ located just behind the breast bone (sternum) in the front part of the chest.
The thymus has 3 main layers:
The medulla is the inside part of the thymus.The cortex is the layer that surrounds the medulla.The capsule is the thin covering over the outside of the thymus.
What is the function of sternum?
The sternum is a long, flat bone that protects the underlying muscles, organs, and important arteries within the chest. This includes the lungs, heart, and stomach, along with all of their intricate blood vessels, muscles, and cartilage.
What is sternum made of?
The sternum (Figure 7.16) consists of eight sternebrae arranged anteroposteriorly midventrally on the thorax. The most anterior of the series is the spear tip-shaped manubrium. In some individuals the manubrium appears to be formed by the fusion of two elements.
