Upper Extremity Functional Grouping

Question 1

Muscle regions and innervation

Answer 1

Musculocutaneous - biceps, brachialis, coracobrachialis
Axillary - shoulder
Radial - posterior arm
Median - forearm flexors
Ulnar - hand

Question 2

What are the boundaries of various anatomical spaces?

Answer 2

Quadrangular Space:
Lateral - Humerus
Medial - Triceps Brachii Long Head
Superior - Teres Minor
Inferior - Teres Major
Triangular Space:
Inferior - Teres Major
Lateral - Triceps Brachii Long Head
Superior - Teres Minor
Triangular Interval:
Superior - Teres Major
Lateral - Triceps Brachii Lateral Head
Medial - Triceps Brachii Long Head
Subacromial Space:
Humeral Head
Acromion
Coracoacromial Ligament
Acromioclavicular Joint
Cubital Fossa:
Lateral - Brachioradialis
Medial - Pronator Teres
Superior - Line between epicondyles
Carpal Tunnel:
Inferior - Carpal Bones
Superior - Flexor Retinaculum
Anatomical Snuff Box:
APL
EPB
EPL
Styloid process of radius
Scaphoid bone
Trapezium bone

Question 3

What are the contents that course through the various anatomical spaces?

Answer 3

Quadrangular Space:
Axillary nerve, posterior humeral circumflex artery
Triangular Space:
Scapular circumflex artery
Triangular Interval:
Radial nerve + profunda brachii artery
Subacromial Space:
Subacromial bursa, Long head of biceps brachii tendon, supraspinatus tendon
Cubital Fossa:
Median nerve, Brachial artery, Tendon of biceps brachii, Radial nerve
Carpal Tunnel:
FDS, FDP, FPL tendons and Medial nerve
Anatomical Snuff Box:
Superficial brach of radial nerve, cephalic vein, radial artery, scaphoid bone, trapezium bone