PHTY100 Lecture Notes - Lecture 2: Biceps, Anatomical Terms Of Muscle, Quadrilateral
Document Summary
Muscle types: skeletal: attaches to and moves the skeleton, voluntary, continuous effort, cardiac: makes up wall of heart, involuntary, smooth: walls of organs, involuntary. Parallel: fibres run in a straight line between attachments: flat/ quadrilateral: Allows for spread of forces over a broad area. Very good for range, not good for generating power. Relatively small insertions into the bone but strong due to large amount of fibres. When the fibres are parallel to the line of pull. E. g. biceps brachii: maximum shortening of muscle and belly and therefore movement at associated joint but not great for force development. Oblique: fibres run on an angle: unipennate. Fibres attach to one side of the tendon. Muscle fibres arranged on two sides of tendon. Muscle divided into sections by strips of connective tissue. E. g. deltoid: less shortening of belly and therefore movement at associated joint reduced, however much more powerful. Circular: fibres run around an opening, close a circle (oraphus)
