Kinesiology 2241A/B Lecture Notes - Lecture 6: Rectus Femoris Muscle, Axial Skeleton, Myofibril

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2241A/B
• Professor: Paul Jenkins

Document Summary

The muscles overlay the skeleton and provide the means to move it. Each muscle produces a motion when it creates tension and tries to shorten. Its attachments and orientation determine what moves and how. Muscles shorten and pull on the two attachments when contracted. You need lots of muscles fibers at joints to create more movements. Mus(cid:272)les o(cid:374)l(cid:455) (cid:272)o(cid:374)tra(cid:272)t the(cid:455) do(cid:374)(cid:859)t k(cid:374)o(cid:449) ho(cid:449) (cid:373)u(cid:272)h the(cid:455) are all (cid:272)o(cid:374)tra(cid:272)ted (cid:271)(cid:455) the (cid:374)er(cid:448)es. Note: different shapes and wrappings of the muscles, different alignment of the fibers within the muscles, size (large or small) of the tendon attachments at either end. The proximal attachment of a muscle is its origin. Closer to the axial skeleton is the origin and attaches more distally. The distal attachment of a muscle is its insertion. Muscle often have wrapping points or retinacula for redirecting muscle pull between the origin and insertion. Some go in a straight line some wrap around things (rectus femoris)