A cadaveric dissection study investigating the relationship between biceps brachii attachment and the glenoid labrum
Jim Maskrey, Patrik Pedersen, Rhona Hunter, Alfredo Dente
Purpose
The purpose of the dissection was to examine one cadaveric shoulder sample and compare the precise insertion of the long head of biceps brachii of this specimen with previous dissection literature. Upon review of respected anatomical literature Gray’s anatomy (1995) states the tendon arises from the supraglenoid tubercle at the apex of the glenoid cavity and continues here with the glenoid labrum. Expanding this description current dissection studies have shown that there are four main insertions into the glenoid labrum:
- Type 1: the labral attachment is entirely posterior with no contribution to the anterior labrum (22%)
- Type 2: Most of the labral contribution is posterior (33%)
- Type 3: There are equal contributions to both anterior and posterior parts of the labrum (37%)
- Type 4: most of the labral contribution is anterior with a small contribution to the posterior labrum
(Margarey 1996, Vangsness et al 1994, Detrisac and Johnson 1986)
