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Anatomy of the parotid gland

Foramina of the Base of the Skull

The anatomical snuffbox (also known as the radial fossa), is a triangular depression found on the lateral aspect of the dorsum of the hand. It is located at the level of the carpal bones, and best seen when the thumb is extended.
As the snuffbox is triangularly shaped, it has three borders, a floor, and a roof:

Ulnar (medial) border: Tendon of the extensor pollicis longus.

Radial (lateral) border: Tendons of the extensor pollicis brevis and abductor pollicis longus.

Proximal border: Styloid process of the radius

Floor: Carpal bones; scaphoid and trapezium.

Roof: Skin.

Contents :
Radial artery 
Superficial branch of the radial nerve 
Cephalic vein 

In a fracture of the scaphoid, the characteristic clinical feature is pain and tenderness in the anatomical snuffbox.

The scaphoid is at particular risk of avascular necrosis after fracture because of its so-called ‘retrograde blood supply’ which enters at its distal end. This means that a fracture to the middle (or ‘waist’) of the scaphoid may interrupt the blood supply to the proximal part of the scaphoid bone rendering it avascular.

Patients with a missed scaphoid fracture are likely to develop osteoarthritis of the wrist in later life.

The circle of Willis is a circulatory anastomosis that supplies blood to the brain and surrounding structures

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