Hand Therapy Practice Exam Question 22 ANSWER




















Correct Answer: D.  All are flexors of the metacarpophalangeal (MCP) joints.

The four lumbricals (Answer A.) originate in the palm from the flexor digitorum profundus (FDP) tendons.  They pass volar to the axis of rotation at the MCP joints and insert onto the extensor mechanism permitting both MCP flexion and IP extension.  

The palmar interossei adduct ("PAD") the index, ring, and small fingers towards the middle finger. The dorsal interossei abduct ("DAB") the index, middle, and ring fingers.  The middle finger has two dorsal interossei to allow it to abduct to both sides.  Both the palmar interossei and dorsal interossei originate from the metacarpal shafts and pass volar to MCP axis of rotation.  They then insert onto the central and lateral bands of the extensor mechanism.  Thus they contribute also contribute to MCP flexion as well as IP extension.

The flexor digitorum superficialis (FDS) has two heads with one originating at the medial epicondyle, coronoid process of the ulna, and ulnar collateral ligament.  The other head originates at the proximal anterior border of the radius. The FDS is the primary flexor of the proximal interphalangeal (PIP) joint but also contributes to MCP flexion due to crossing the MCP prior to inserting onto the middle phalanges.

Rehab of the Hand Electronic Location 1686

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