Humerus – The funny bone is one of the major bones of the upper limb. It is a cartilaginous long bone with a diaphysis, metaphysis and epiphysis and epiphyseal plate. Humerus connect proximally to the scapula at the glenoid and distally to the ulna at the trochlea and with the radius at the capitulum.
The anatomical position of humerus is shown below.
Anatomical Position of the Humerus
The humerus has a head at the proximal end which is surrounded by two tuberosities aka the greater and the lesser tuberosities. The greater tuberosity gives attachment to the rotator cuff muscles i.e. supra spinatus, infra spinatus, and teres minor. The lesser tuberosity gives attachment to the subscapularis muscle of the rotator cuff.
Separating the two tuberosities is the intertubercular sulcus through which the tendon of long head of biceps brachii passes. On the anterior edge of the groove is the attachment of the pectoralis muscle and teres major. On the posterior edge is the attachment of the latissimus dorsi.
The humerus then continues into the shaft. The shaft on the posterior aspect has a radial groove for the radial nerve.
At the distal end of the humerus are the medial and lateral condyles, that give attachment to the various forearm muscles.
The capitulum is a rounded projection at the distal end of the humerus that attaches to the cup shaped upper end of the radius. The trochlea is a pulley shaped structure that attaches to the ulna . In the front at the distal end are the radial and coronoid fossae that accommodate the radius and the coronoid process of the ulna.. At the back is the olecranon fossa that accommodates the olecranon process of the ulna.
Learn more about Humerus – The funny bone by getting a copy of Snell’s anatomy below.