NSCI 324 Lecture Notes - Lecture 5: Triceps Brachii Muscle, Brachialis Muscle, Motor Unit
27 Feb 2017
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Document Summary
Systems neuroscience limb mechanics: motor units, muscle mechanics, limb mechanics, muscle anatomical action. Key points related to limb biomechanics: human body can be modeled as a mechanical system. Muscular torques are equal and opposite to joint torques. Muscular torques are generated by muscles that span that joint: muscle forces are much higher than forces we apply to the environment, all muscles will be recruited to generate muscular torque. Force f acting at a distance d ge(cid:374)e(cid:396)ates a to(cid:396)(cid:395)ue . Positive force and torque: right hand rule. Balance force x distance on each side. Simple model of the elbow when you hold an object. Dm: brachialis g = -10 m/s^2 d1 = 15 cm, d2 = 30 cm, dm = 5 cm: forearm and hand. Force f1 = m1 * g = -30n. Torque at elbow = 1 = f1 * d1: dumbbell. Force f1 = m1 * g = -50n. Torque at elbow = 2 = f2 * d2.
