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The intertubercular sulcus, or sulcus intertubercularis in latin, is a prominent feature of the humerus. It is also commonly referred to as the intertubercular groove, or the bicipital groove. As its name suggests, this deep indentation lies between the humeral tubercles, separating the lesser tubercle from the greater tubercle of the neck of the humerus. The intertubercular sulcus extends inferiorly and obliquely along the proximal humerus, terminating before the middle third of the humeral shaft. It consists of a lateral lip and a medial lip.
There are three major muscles that have tendinous attachments at the intertubercular sulcus. The tendon of the pectoralis major muscle inserts on to the lateral lip, the tendon of the teres major muscle inserts on to the medial lip, and the tendon of the latissimus dorsi muscle inserts on to the floor of the intertubercular sulcus, the space contained between the medial and lateral lips.
The transverse humeral ligament extends across the proximal end of the intertubercular sulcus, from the lesser tubercle to the greater tubercle. This creates a passage within which the tendon of the long head of the biceps brachii muscle can course, though the tendon has no attachments to the intertubercular sulcus itself.
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