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Intermediate Layer (Anterior) PowerPoint Presentation
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Intermediate Layer (Anterior) - PowerPoint PPT Presentation


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slide1

Flexor digitorum superficialisO: Medial epicondyle of humerus ulnar head: medial coronoid process radial head: upper 2/3 of anterior border of radius just distal to radial tuberosityI: sides of middle phalanx of four digits (palmar surface)A: Flexion of fingers at MCP and PIP joints, flexion of wrist, weak flexion of elbow

intermediate layer anterior
Intermediate Layer (Anterior)

Flexor digitorum superficialis

movements of the thumb
Movements of the Thumb
  • Flexion and Extension
  • Abduction and Adduction
helpful hints
Helpful Hints
  • “pollicis” – thumb (1st)
  • “indicis” – index finger (2nd)
  • “pollicis” and “indicis” exclusive to wrist and fingers
slide5

Flexor digitorum profundusO: Proximal ¾ anterior and medial ulnaI: Base of distal phalanx of four fingersA: Flexion of four fingers at MCP, PIP, and DIP joints, wrist flexion

slide6

Flexor pollicis longusO: Middle anterior surface of radius and anterior medial border of ulna distal to coronoid processI: Base of distal phalanx of thumb (palmar surface)A: flexion of thumb CMC, MCP, IP joints, flexion, abduction of wrist

deep layer anterior
Deep Layer (Anterior)
  • Flexor digitorum profundus
  • Flexor pollicis longus
  • *Pronator Quadratus
slide8

Extensor indicisO: Middle to distal 1/3 of posterior ulnaI: Base of middle and distal phalanxes of 2nd phalange (dorsal surface)A: Extension of index finger at MCP joint, weak wrist extension, weak supination of forearm from pronated position

slide9

Extensor pollicis longusO: Posterior lateral surface of lower middle ulnaI: Base of distal phalanx of thumb (dorsal surface)A: Extension of thumb at CMC, MCP, and IP joints, wrist extension and abduction, weak supination from a pronated position

slide10

Extensor pollicis brevisO: Posterior surface lower middle radiusI: Base of proximal phalanx of thumb (dorsal surface)A: Extension of thumb at CMC and MCP joint, weak wrist extension and abduction

slide11

Abductor pollicis longusO: Posterior aspect of radius and midshaft of ulnaI: Base of 1st metacarpal (dorsal surface)A: Abduction and extension of thumb at CMC joint, abduction of wrist, weak supination of forearm from a pronated position

deep layer posterior
Deep Layer (Posterior)
  • Extensor indicis
  • Extensor pollicis longus
  • Extensor pollicis brevis
  • Abductor pollicis longus
  • *Supinator
slide13
Static Equilibrium
  • Whenever an object is completely motionless, it is in static equilibrium
  • For an object to be in static equilibrium:

1)  Fv = 0

2)  Fh = 0

3)  T = 0

slide14
Example: How much force must be exerted by the biceps brachii, attaching at 90º to the radius at 3 cm from the elbow joint, to support a weight of 70 N held in the hand, a distance of 30 cm from the elbow joint?
slide16
Known:

dm = 3 cm = 0.03 m

dwt = 30 cm = 0.3 m

wt = 70 N

Fm = ?

slide17
 T = 0

 T = (Fm)(dm) - (wt)(dwt) = 0

slide19
Example: How much force must be exerted by the biceps brachii, attaching at 100º to the radius at 3 cm from the elbow joint, to support a weight of 70 N held in the hand, a distance of 30 cm from the elbow joint?
carpal tunnel syndrome
Carpal Tunnel Syndrome
  • Swelling of tissue within the compartment causes compression on the median nerve
  • Symptoms include:
    • Pain and numbness along the median nerve
    • Clumsiness of finger function
    • Weakness and atrophy of muscles
  • Most common in middle-aged women or older