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Lecture

Lecture Notes - M. Nov 26

6 Pages
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Department
Kinesiology & Health Science
Course Code
KINE 2031
Professor
all

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Lecture - November 25, 2013 Muscles of the forearm • He will tell us which ones we need to know for origins and insertion, and today we are going to learn them • Medial epicondyle of the humerus (common origin) o Muscles of forearm anterior side- common origin: medial epicondyle (MUST KNOW THIS!) • There is a lot of muscles in the forearm which control the wrist and the fingers o Layered superficial to deep o Radius is on the lateral side o Ulna on the medial side o Interosserous membrane in the middle o Anterior side of the two bones- they will flex the wrist o Posterior side of the two bone- extend • Most powerful movement is flexion therefore more muscles in the anterior side • Flexor carpi ulnaris o Common origin - medial epicondyle o Goes all the way down to the carpals o Medial side of the forearm o Flex the elbow and flex the wrist o Inserts on the medial carpal bones • Flexor carpi radials o Originates - medial epicondyle of humerus o Radial/lateral side o Flex the elbow and flex the wrist and o Cross all the way to the thumb side o Inserts on lateral side of the carpal bones - base of the fifth metacarpals • If a pivot was put in the center of your wrist o Flexor carpi ulnaris - adduction o Flexor carpi radial - abduction Pronator teres • We learned about this previously • Originates - medial epicondyle of the humerus • Goes all down to the radius • Pronator rotates it over • Flex elbow • Pronate the forearm • Next to it is the flexor carpi radials Unique muscle between the flexor carpi radials and flexor carpi ulnaris • Called the Palmaris longus • Origin - medial epicondyle of humerus • Inserts to the connective tissue on the palm called the palmar aponeurosis o Palmar - means on the palm side or the anterior side o The tendon is flat • There is a band that cross the wrist called flexor retinaculum o Connective tissue which goes from the radius to the ulna • Backside called the extensor retinaculum • If you look at your wrist and flex it, you will see a tendon that stands out o That is the tendon Palmaris longus • The other tendons are under the retinaculum, held in place Palmaris Longus • The Palmaris Logus is unique in two ways: o Above retinaculum o Broad tendinosis sheet, instead on a bone • It helps with flexing the wrist • It is an important muscle when you shake your hand - it helps tighten the palm of your hand • It pulls and puts tension on the palmar aponeurosis Flexor retinatculum • Unique ability to shorten • As it shortens, it pulls on the tendons • If you didn't lock the tendons in there would be a bow out • Since it is locked in, the tendons are transferred to the movable bones • The retinatulum is designed to keep the tendons in place Cross section of Carpal tunnels • The PowerPoint illustrates, where the palmaris longus and retinaculum are found • Tendon of the superficial group of muscles • You can see the retinaculum keeping tendons in place • You can see the tendons for the deeper muscles Carpal tunnel syndrome • There is a synovial membrane around the tendons, lubricates it in order to reduce friction because the tendons are moving in and out • This syndrome - tendons attacked to the muscles are irritated • Repetitive stress injury • Every time you flex your fingers, the tendons move in and out and when you can the carpal tunnel syndrome you will have inflammation • Ways to reduce - don't sit at the keyboard for long time, give your self a break , give your carpal tendons a break • Commonly found in keyboard, piano players, guitar players, car dealers, etc. Superficial muscles on the anterior side of the forearm • Common origin - medial epicondyle of the humerus • Flexor carpi ulnaris o It is a flexor and goes down to the carpals • Palmaris longus o Goes down the middle • Flexor carpi radialis o Towards the thumb • Pronator teres • Look at the diagram on the ppt • Perfect explanation where they go and these are the superficial flexors of the forearm Flexor digitorum superficialis •Flexion •It goes to your digits (fingers) •It is superficial and there must be a deep one •Common origin: medial epicondyle of the humerus and little bit on the anterior side of the radius •It goes to the middle phalange •Four tendons which come down and pass to the fingers •When it shortens it will flex o Elbow - flex o Wrist - flex o Knuckles - flex o Proximal and middle phalange - flex o Distal phalange - doesn't do anything the tendon doesn't go there Flexor digitorum profundus •The deep one •As you go superficial to do, you go high to low •It starts a little lower, doesn't cross the elbow •Lower the elbow down to the distal falange •Same length of the flexor digitorum superficialis •Function - wrist flexion and flexion of all the phalanges Movement of the fingers •You can't move the fifth finger and without moving the fourth finger •Or
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