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Humerus

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Figure 3.

You are watching: Rounded knob on the humerus that articulates with the radius

Humerus or top arm bone. Both the right and left humerus bones are shown. Notice the proximal end"s head the the humerus, the surgical neck (easier to cut or break than the anatomical neck), the higher tubercle ~ above the lateral side, the deltoid tuberosity, the olecranon fossa, the lateral and also medial epicondyles and the distal condyle (has 2 parts: trochlea and also capitulum).

There is one bone in the arm region called the humerus. The humerus is a long bone that has two distinctive bulbous ends dubbed the epiphyses and a middle region generally referred to as the diaphysis. At the proximal epiphysis, is a rounded round shaped area referred to as the head the the humerus. This function fits in through the glenoid cavity of the scapula and is one component of what is dubbed the shoulder joint. Next to the head that the humerus is the anatomical neck.

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located on the lateral side of the proximal epiphysis is an expanded area called the greater tubercle and also a smaller lesser tubercle that room separated indigenous each various other by the intertubercular groove. Both the higher tubercle and also lesser tubercle room attachment points for muscles the act across the shoulder joint. The surgical neck is situated at the base of the proximal epiphysis and attaches come the diaphysis. The operation neck is typically a website of eight fractures. ~ above the diaphysis, is a roughed area dubbed the deltoid tuberosity, which is a website of attachment for a muscle dubbed the deltoid. ~ above the distal epiphysis the the humerus is situated a condyle. This condyle is divided up right into two parts. The medial component of the condyle is called the trochlea, this is a pulley-shaped region which articulates through the trochlear notch of the ulna. The lateral part of the condyle is the capitulum, a rounded, knob-like framework that articulates v the radius bone. ~ above the posterior distal epiphysis, is a deep depression called olecranon fossa that receives the olecranon procedure of the ulna and permits movement in ~ the elbow joint together the arm extends.