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a. Head (Caput humeri) is a large, rounded, prominence that extends medially from the bone's proximal end. It articulates with the glenoid fossa of the scapula to form the glenohumeral joint or shoulder joint.
b. Greater Tubercle (Tuberculum majus) is a large, roughened area located lateral to the head. The supraspinatus, infraspinatus and teres minor muscles attach to this elevation.
c. Anatomical Neck (Collum anatomicum) is a grooved constriction between the head and tubercles that serves as an attachment point for the articular (joint) capsule.
d. Surgical Neck (Collum chirurgicum humeri) is an region inferior to the tubercles where the bone narrows and fractures often occur.
e. Shaft or Body (corpus humeri) is the elongagted, cylinder shaped middle portion of the bone. Its relatively smooth surface is the insertion point for muscles that move the upper arm and the origin point for muscles that move the lower arm.
Humerus Bone Anatomy: Anterior Markings
f. Deltoid Tuberosity (Tuberositas deltoidea) is a raised, roughened area located on the lateral side of the shaft at its midpoint. It is an attachment point for the deltoid muscle.
g. Radial groove or sulcus (Sulcus nervi) is a shallow depression that runs diagonally along the lateral posterior surface of the bone, next to the deltoid tuberosity. It forms a partial passageway for the radial nerve and deep brachial artery.
h. Lateral Epicondyle (Epicondylus lateralis) is a rounded projection at the distolateral end of the humerus. The posterior surface of the lateral epicondyle serves as an attachment point for some of the muscles that extend the wrist and fingers of the hand.
i. Supracondylar Ridge (Crista supracondylaris lateralis) is the roughened margin located above the lateral epicondyle. The brachioradialis muscle attaches along this edge of the bone.
j. Medial Epicondyle (Epicondylus medialis) is a rounded projection at the distomedial end of the humerus. Some of the muscles that flex the forearm, wrist, and fingers attach to anterior surface of this marking.
k. Trochlea (Trochlea humeri) is a pulley-shaped formation located medial to the capitulum. This region articulates with the trochlear notch of the ulna bone at the elbow joint
l. Olecranon fossa (Fossa olecrani) is a prominent, triagular-shape depression on the distal posterior surface, superior to the trochlea. This area accepts the olecranon process of the ulna when the forearm is extended.
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