Electrical stimulation can be used to artificially inititiate an action potentia

Question

Electrical stimulation can be used to artificially inititiate an action potential in a nerve. In the second part of today's lab we will examine the effect of electrical stimulation along the surface of forearm on contraction of muscles that control movements of the wrist and hand. We will be stimulating the motor points that are indicated on the illustration in the link below.

http://i68.tinypic.com/1yl2xs.png

if that link didn't work try:

https://useast1-lessonfiles-cdn.kuracloud.com/8/live-/useast1.kuracloud.com/ac5214ba/807ec3d8-b5fb-4e03-aeaf-369a9f6b6334?Expires=1505206800&Signature=ILgwNTyWeXQB67shGieh-mwBI-0ck7YRPabOxi0is0JQ7zw4gR8N6f3u8VK3ILYFGv-RZyIW9UR5eNlpEKOjiThESdX7qp3AKwLWlw8co4PegS5C~oKBeRWfs6V0Q9R9NglBM-j5ALBJWU9wQ6UBQNleoIIoqDSojARm4jqEe8y1RoUp34yd4c038pu5sEMQAMfvItGsZAagQcrETkO3F28L9Vcbgo7yRbSw4DZja70Dyb9TnXObZfXlaCxToOzilNufINCIHMN9tiax80-eVlQ-zg35PIcYp7PM5JVOecBpx6ZstwBThCDMgVhnLXk4ZldgvGnAVUI0AzeQ7xRzEg__&Key-Pair-Id=APKAIXNQBADWSFUW37WA

Muscle Movements

- Abduct: to draw away from the main axis of the body.

- Adduct: to draw toward the main axis of the body.

- Flexor: a muscle that bends a limb or body part at a joint so that the angle of the joint decreases.

- Extensor: a muscle that straightens a limb or body part at a joint so that the angle of the joint increases.

Use this illustration in the link below to record the motor points that will be stimulated and indicate the muscle movements for each point. Please SHOW ALL annotations for the drawing.

http://i65.tinypic.com/28mgxs5.png

if that link didn't work try:

https://useast1-lessonfiles-cdn.kuracloud.com/5/live-/useast1.kuracloud.com/ac5214ba/5aa24a9f-a074-48a0-92d2-33b69eeec12e?Expires=1505206800&Signature=ywx3Ny0VOqpI9yrwQhblzBNi1Tmd4-OLDOpHUSKy4tlCKcQM673indjPKvzPBmvFnjSe91CnI~WISXQcDOC8QRbyf8At51kNbOvv5Wr8C~VV-C6Q~R6sWQBROR4zi~tLFzp8Qm1DY9EZoDLQmmuVNGzh85Js35SctzDOLFnD9WXZqeKFb3TwCImUyrwrUwWvziY8oAE6g5rfMkwnnbpYuJUVCKk0haVE2I6Ry-2tEMwvLguOHkAaSqfuKWxbA8QvKdzK9IBbNCobXO76NfcpJOBhb4UzTF4qnSkms3~3Xcq1SBe1Iqctkwn9mexrx7cVevUFum7D20XI7K9brVRvVw__&Key-Pair-Id=APKAIXNQBADWSFUW37WA

Explanation / Answer

Answer. On electrical stimulation, biceps branchii will show elbow flexion movement.

(b)Flexor carpi radialis produced extension of joint in the direction of wrist flexion. While Flexor carpi ulnaris does not aloow full extension of the joint thereby control the movement.

(c) Flexor digitorum profundus and ulnar nerve on stimulation causes digit flexion movement and thereby fully extending the fingers.

(d) Abduction pollicis on stimulation will result in the strong abduction movement of thumb.

(e)Lumbricals on stimulation will result in extension of phalangeal joints producing extension of finger extensors.

(f) Flexor carpi ulnaris when stimulated will cause flexion movevement / flexing of elbow.

(g) Flexor carpi superficialis on stimulation results in flexion movevement of the middle phalanges of the fingers at the proximal interphalangeal joints.

(h) Flexor pollicis longus helps in flexing movement of thumb.

(i) Median nerve on electrical stimulation results in providing opposing effect of thumb.

(j) Ulnar nerve on electrical stimulation provides sensory innervation to the little finger thus causing a shock like sensation.

(k) On electrical stimulation the palmaris brevis causes curling of palm.

(l) Palmaris longus on electrical stimulation provides weak flexing movement to wrist.

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