Sciencedoze: Science, Education and Technology

The humerus is a long bone located in the upper limb, spanning from the shoulder to the elbow joint. The greater tubercle is a bony prominence located on the lateral side of the humerus, below the anatomical neck. The lesser tubercle is a smaller bony projection located on the anterior side of the humerus, near the anatomical neck. The greater tubercle is a prominent bony projection located on the lateral side of the proximal humerus. It provides attachment points for various muscles and tendons of the shoulder. The narrow intertubercular groove, also known as the sulcus, passes between the greater and lesser tubercles of the humerus. This groove provides a pathway for certain structures, such as tendons and blood vessels, to pass through and interact with the surrounding shoulder anatomy. The roughened, U-shaped area located at the middle portion of the humeral shaft is known as the deltoid tuberosity. This prominence serves as an attachment site for the deltoid muscle, a major m...

The femur is the longest bone in the skeleton. The small depression on the femoral head is called the fovea capitis. The head of the femur is spherical in shape and forms a ball-and-socket synovial joint with the acetabulum of the pelvis. The neck of the femur serves as the connection between the femoral head and the femoral shaft (body). The larger bony prominence located laterally is known as the greater trochanter. The smaller bony prominence located medially and more posteriorly is known as the lesser trochanter.

 1. Ulna The ulna is situated on the inner (medial) side of the forearm and is longer in length compared to the radius. At the proximal end of the ulna, there is a distinctive c-shaped indentation called the trochlear notch. The coronoid process, a prominent bony projection, forms the lower boundary of the trochlear notch at the proximal end of the ulna. On the anterior side of the ulna, just below the coronoid process, there is a roughened area known as the ulnar tuberosity. To the lateral side and slightly inferior to the trochlear notch, there is a small and smooth area known as the radial notch. At the proximal end of the ulna, there is the olecranon, which forms the prominence of the elbow. 2. Radius  The radius is the smaller of the two bones in the forearm and runs parallel to the ulna on the lateral side of the forearm. The proximal end of the radius features a disc-shaped structure known as the head. The neck of the radius is the region immediately below the expan...