Anatomy and Cell Biology 3319 Lecture Notes - Lecture 6: Pectoralis Major Muscle, Mastication, Zygomaticus Major Muscle

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They have an orientations, you have striations (myosin and actin) and the nuclei. Muscles come in different shapes which relate to their function. Bracii= has two heads and is in the arm. As you see the names gives you part of the characterization. This gives a lot of power to the upper limb (broad attachment: parallel; muscle fibers arrangement running in parallel, unipenate; penate means an oblique attachment. Ie brachi muscle, fibers come in at an oblique angle to insert on a tendon for example. They"re almost like a feather, you have the midle of the feather (core) and the feather coming on each side. Uni-penate would mean that feathers coming off of one side, the bipenate; feathers coming off both sides, and multipenate; feathers coming off multiple sides. A muscle always has 2 attachments at either end and works across a joint that.

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