This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
[{'content': 'Which of the following structure is intracapsular ? \nSelect and explain. \nA. Sho head of biceps brachii, B. Medial head of triceps brachii, C. Long head of triceps brachii, D. Long head of biceps brachii', 'role': 'user'}, {'content': "Answer: D \nExplanation: Fibrous capsule envelopes the shoulder joint and is attached medially to the glenoid neck at a variable distance from the glenoid labrum,so forming recesses anterior and posterior to the scapular neck. The capsule includes the supraglenoid tubercle,to which the long head of biceps attaches,and which is therefore intracapsular. Ref: Gray's Anatomy The Anatomical Basics of Clinical Practice 41 e pg 813.", 'role': 'assistant'}]