dr_singh246
internal medicine pgy2
Topics: 235
Posts: 561
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A 51-year-old supermarket cashier begins to have difficulty working,
sometimes ringing up the wrong amount because her right hand
feels "weak." She also notes that her right hand sometimes feels
numb after working for long periods of time. Physical examination
reveals loss of sensation on the palmar aspect of her thumb and
first two fingers, as well as atrophy of the thenar eminence on
her right hand. The nerve most likely injured in this patient
also innervates which of the following muscles?
A. Adductor pollicis
B. Extensor digitorum
C. Extensor pollicis longus
D. Flexor carpi ulnaris
E. Flexor digitorum superficialis
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to love when it can be lost, to go on when progress seem futile and to believe in every fiber of your body. to live , have hope and faith and to never give in.... dr_singh246@yahoo.com
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| att
Forum Senior
Topics: 4
Posts: 135
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nerve is median nerve and muscle is flex digitorum superficialis[/code]
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| anatomy
Forum Guru
Topics: 101
Posts: 423
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agree it's "e"
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| mjl1717
Forum Hero
Topics: 959
Posts: 5,467
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f.c.u.-ulnar
adductor pollicis -deep radial
extensors-radial
Flexor digit. superficialis is the only left that may cause carpal tunnel or
entrapment of median nerve near flexor retinaculum
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| barbie
Forum Newbie
Topics: 2
Posts: 11
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FLEXOR DIGITORUM SUPERFICIALIS
- Anatomy:
- origin:
- humero-ulnar head: medial epicondyle of the humerus by common tendon, ulnar collateral ligament of elbow & coronoid process of ulna;
- radial: oblique line of the radial tuberosity to the insertion of pronator teres;
- orgins are interconnected by a fibrous aponeurosis that overlies the median nerve and the ulnar artery;
- in the midpart of the forearm, the superficialis muscle divides into four bundles, which separate into a superficial and a deep layer;
- superficial layer includes tendons to the long and ring fingers
- deep layer includes tendons to the index and little fingers;
- FDS tendon to the small finger may not be present in all individuals
- at wrist, flexor superficialis tendons are volar to tendons of FDP,
and FDS covers the median nerve proximally in the forearm;
- in mid palmar area, the FDS tendons are more volar than the flexor profundus tendons;
- both enter the fibrous annular ligaments and the synovial sheaths;
- at level of MP joints, FDS becomes more dorsal& FDP tendon more volar;
- proximal skin creases at base of digits coincide w/ separation of FDS tendons into 2 segments, while the FDP becomes subcutaneous
and the flexor superficialis is deep;
- in this zone II region overlying the proximal phalanx, both the fds and fdp tendons are relatively avascular;
- once they enter the flexor tendon sheath, the FDS separates into 2 segments, which pass around FDP tendon, and which then reunite at Camper's chiasma (dorsal
to the FDP) as they insert onto the radial and ulnar aspects of the proximal half of the middle phalanx;
- insertion:
- four tendons (one for ea finger) divide for passage of tendons of FDP then insert as 2 slips on sides of 2nd phalanx about the middle;
- action:
- flexes the 2nd phalanx of each finger on the proximal phalanx;
- continued action, flexes the 1st phalanx at the hand;
- hand at the wrist, flexes the forearm at the elbow;
- synergist: FDP;
- nerve supply: median, C7, C8, T1;
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