Questions
3 questions per paper
Difficulty
Medium-Hard
Importance
High yield for anatomy viva and theory papers
Overview
The upper limb anatomy covers the structural composition and functional mechanics of the shoulder, arm, and hand. Understanding this region is essential for clinical examination and surgery, forming a high-yield portion of medical and allied health science examinations.
Shoulder and Arm Muscles
The shoulder complex relies on the rotator cuff muscles for stability, while the arm muscles are organized into anterior and posterior compartments. Mastering the origin, insertion, and action of these muscles is critical for assessing upper limb mobility and common injury patterns.
- Rotator Cuff: Supraspinatus, Infraspinatus, Teres Minor, Subscapularis
- Anterior Arm: Biceps Brachii, Coracobrachialis, Brachialis
- Posterior Arm: Triceps Brachii (Long, Lateral, and Medial heads)
- Primary action of Biceps Brachii: Flexion of elbow and supination of forearm
- Primary action of Triceps Brachii: Extension of elbow joint
Brachial Plexus
The brachial plexus is a network of nerves originating from C5 to T1 spinal roots that innervate the upper limb. It is frequently tested due to its complex branching pattern and the clinical consequences of specific nerve injuries.
- Components: Roots, Trunks, Divisions, Cords, Branches
- Roots: Ventral rami of C5-T1
- Main terminal nerves: Musculocutaneous, Axillary, Radial, Median, Ulnar
- Erb's Palsy results from injury to C5-C6 roots
- Klumpke's Palsy results from injury to C8-T1 roots
Bones of the Hand
The hand consists of carpal bones, metacarpals, and phalanges organized for complex motor control. Precise identification of these bones and their articulations is vital for trauma and radiographic evaluation.
- Proximal row of carpals: Scaphoid, Lunate, Triquetrum, Pisiform
- Distal row of carpals: Trapezium, Trapezoid, Capitate, Hamate
- 5 Metacarpals forming the palm
- Thumb (Pollex) consists of two phalanges; other digits have three
- Mnemonic for carpals: Some Lovers Try Positions That They Can't Handle
Exam Tip
Draw a clear, labeled schematic diagram of the Brachial Plexus for every long-answer question on this topic; it is the most reliable way to secure high marks.
Common Mistakes
- Confusing the nerve innervation of the anterior versus posterior compartment muscles of the arm.
- Misremembering the order of the carpal bones from lateral to medial.
- Failing to distinguish between the superficial and deep branches of terminal nerves in the brachial plexus.
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