Explanation -

Anatomical snuff box : Boundary

1. Lateral boundary - APL, EPB

2. Medial boundary - EPL

Mnemonic - 
Brevis b/w two longus -

All three tendon attached on thumb (pollicis)

for more detail click on below pic

Explanation - 

Biciptal groove - Attachment and content

Content : Biceps brachi, Anterior circumflex humeral artery (ascending branch)

for more detail click on below pic.

Explanation - 

1. Golfers elbow - Medial epicondylitis

2. Tennis elbow - Lateral epicondylitis

3. Students elbow - Olecranon bursitis

4. Pulled Elbow - Radius head dislocation

for more detail click here below pic.

Explanation - 

1. Coracoid process - Scapula bone - Pectoralis minor attach

2. Coronoid process - Ulna bone - Brachialis muscle attached

Explanation - 

for more detail click here below pic.

Structure that pierce clavipectoral fascia -
Mnemonic : CALL
1. Cephalic vein

2. Acromiothoracic artery (branch of axillary artery)

3. Lateral pectoral nerve

4. Lymphatics

Explanation -

Brachial plexus - Posterior cord - Branches

1. Upper subscapular nerve

2. Lower subscapular nerve - Teres major muscle

3. Thoracodorsal nerve

4. Radial nerve

5. Axillary nerve

for more detail click on below pic.

Explanation - 
A. Olecranon process - Ulna bone (upper end)
B. Coronoid fossa - Humerus bone (lower end)
C. Trochlear notch - Ulna bone (upper end)
D. Capitulum - Humerus bone (lower end)
E. Radial fossa - Humerus bone (lower end)

for more detail click on below pic.

Explanation -

Axilla medial boundary - Serrtus anterior muscle, long thoracic nerve, ribs.

for more detail click on below pic.