Anterior Deep Muscles

• Flexor Policis Longus - Location & Action

  partly covered by flexor digitorum superficialis

  parallels flexor flexor digitorum profundus laterally

  flexes distal phalanx of thumb

  
• Flexor Digitorim Profundus - Location & Action

  extensive origin

  overlain entirely by flexor digitorim superficialis

  flexes distal interphalangeal joints

  slow-acting flexor of any or all fingers

  help flex wrist

  
• Pronator Quadratus - Description, Location, Origin & Insertion

  deepest muscle of distal forearm

  passes downward + laterally

  only muscle that arises solely from ulna + inserts solely into radius

  origin - distal portion of anterior ulnar shaft

  insertion - distal surface of anterior radius

  
• Pronator Quadratus - Action

  prime mover of forearm pronation

  acts w pronator teres

  also helps hold ulna + radius together