Lecture Notes 1.4

Lecture Notes 1.4 - The Shoulder Preliminaries What kind of...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
1 The Shoulder 2 Preliminaries • What kind of 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
2 3 Preliminaries • What kind of joint? – Ball and socket • What degrees of freedom (3D)? 4 Preliminaries • What kind of joint? – Ball and socket • What degrees of freedom (3D)? – Mx, My Mz • And what reactions?
Background image of page 2
3 5 Preliminaries • What kind of joint? – Ball and socket • What degrees of freedom (3D)? – Mx, My Mz • And what reactions? – Fx, Fy, Fz 6 Part of “Actual” shoulder joint
Background image of page 3

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

View Full DocumentRight Arrow Icon
4 7 Lateral View of Shoulder Joint 8
Background image of page 4
5 9 “Shoulder Joint” is actually 3 joints Glenohumeral • Acromioclavicular – “Plane” joint • Sternoclavicular – “Saddle” joint 10
Background image of page 5

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

View Full DocumentRight Arrow Icon
6 11 Protraction (abduction) of the scapula: laterally and anterior movement along the chest wall. Muscles: serratus anterior is the prime mover. Pectoralis minor and major, the latter acting through the humerus, may assist (act as synergists). Retraction/adduction of the scapula: The scapula is moved posteriorly and medially along the chest wall. Muscles: rhomboideus major, minor, and trapezius are the prime movers. The muscles that protract and retract the scapula are antagonistic, that is, they have opposed actions. Used together, they fix the scapula in space to provide a fulcrum from which to move the (lever) arm. http://www.med.umich.edu/lrc/coursepages/M1/anatomy/html/modules/upper_limb_module/upper_limb_03.html 12 Scapular Elevation and Depression: Elevation of the scapula moves the scapula superiorly. It is not synonymous with upward rotation of the scapula Muscles: levator scapulae and the upper fibers of trapezius. Depression of the scapula moves the scapula inferiorly. It is not synonymous with downward rotation of the scapula. Muscles: pectoralis minor, the lower fibers of trapezius, subclavius (through clavicle), and latissimus dorsi (through the humerus). http://www.med.umich.edu/lrc/coursepages/M1/anatomy/html/modules/upper_limb_module/upper_limb_03.html
Background image of page 6
7 13 Anterior Posterior 14 The scapula can pivot on its attachment to the clavicle, and rotate upward. This is also called upward rotation of the glenoid fossa, and it is an essential motion for completing abduction of the arm. Muscles: trapezius and serratus anterior are synergists. http://www.med.umich.edu/lrc/coursepages/M1/anatomy/html/modules/upper_limb_module/upper_limb_03.html
Background image of page 7

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

View Full DocumentRight Arrow Icon
8 15 16
Background image of page 8
9 17 ABDUCTION/ADDUCTION Abduction of the arm is also called abduction of/at the shoulder. This motion actually can be divided into two motions: true abduction of the arm at the shoulder and upward rotation of the scapula. Muscles: supraspinatus (initiates abduction - first 15 degrees), deltoid (up to 90 degrees), trapezius and serratus anterior (scapular rotation, for abduction beyond 90 degrees).
Background image of page 9

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

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/30/2012 for the course 125 208 taught by Professor Shreiber during the Spring '08 term at Rutgers.

Page1 / 39

Lecture Notes 1.4 - The Shoulder Preliminaries What kind of...

This preview shows document pages 1 - 10. Sign up to view the full document.

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