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Flexor digitorum superficialis O:Medial epicondyle of humerus ulnar head: medial coronoid process radial head: upper 2/3 of anterior border of radius just.

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Presentation on theme: "Flexor digitorum superficialis O:Medial epicondyle of humerus ulnar head: medial coronoid process radial head: upper 2/3 of anterior border of radius just."— Presentation transcript:

1 Flexor digitorum superficialis O:Medial epicondyle of humerus ulnar head: medial coronoid process radial head: upper 2/3 of anterior border of radius just distal to radial tuberosity I: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

2 Intermediate Layer (Anterior) Flexor digitorum superficialis

3 Movements of the Thumb Flexion and Extension Abduction and Adduction

4 Helpful Hints “pollicis” – thumb (1 st ) “indicis” – index finger (2 nd ) “pollicis” and “indicis” exclusive to wrist and fingers

5 Flexor digitorum profundus O:Proximal ¾ anterior and medial ulna I:Base of distal phalanx of four fingers A:Flexion of four fingers at MCP, PIP, and DIP joints, wrist flexion

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

7 Deep Layer (Anterior) Flexor digitorum profundus Flexor pollicis longus *Pronator Quadratus

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

9 Extensor pollicis longus O: Posterior lateral surface of lower middle ulna I: 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

10 Extensor pollicis brevis O: Posterior surface lower middle radius I: Base of proximal phalanx of thumb (dorsal surface) A: Extension of thumb at CMC and MCP joint, weak wrist extension and abduction

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

12 Deep Layer (Posterior) Extensor indicis Extensor pollicis longus Extensor pollicis brevis Abductor pollicis longus *Supinator

13 Static Equilibrium Whenever an object is completely motionless, it is in static equilibrium For an object to be in static equilibrium: 1)  F v = 0 2)  F h = 0 3)  T = 0

14 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?

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16 Known: d m = 3 cm = 0.03 m d wt = 30 cm = 0.3 m wt = 70 N F m = ?

17  T = 0  T = (F m )(d m ) - (wt)(d wt ) = 0

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19 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?

20 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

21 Carpal Tunnel

22 Mechanism of Injury


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