DEDUCING JOINT MOTION

DEDUCING JOINT MOTION - 2. Which bone(s) is (are) free to...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
DEDUCING JOINT MOTION Information you need to know in order to deduce the most likely joint action a muscle will cause: 1. Points of attachment of the muscle 2. Line of action of the muscle 3. Relation of the line of action of the muscle to the joint center o if the line of action of the muscle is above the joint center – the muscle action will raise the bone o if the line of action of the muscle is below the joint center – the muscle action will lower the bone o if the line of action of the muscle is directly through the joint center – the muscle action will compress the joint and no turning will occur 1. The degrees of freedom of the joint, and the bony structure of the joint
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 2. Which bone(s) is (are) free to move and which bone(s) is (are) fixed in position. This is usually determined by the stabilizing action of muscles. 3. Action of neutralizing muscles preventing an unwanted action of an agonist which is capable of more than one action 4. Direction of the line of gravity relative to the joint center. Gravity acting on body segments will cause joint turning. This turning force is greatest when the line of gravity is perpendicular to the mechanical axis of the bone. Gravity causes no turning, at all, when the line of gravity is directly in line with the mechanical axis of the bone....
View Full Document

This note was uploaded on 09/25/2010 for the course EXS 31757 taught by Professor Brennan during the Spring '10 term at Oakland University.

Page1 / 2

DEDUCING JOINT MOTION - 2. Which bone(s) is (are) free to...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online