Acromioclavicular “AC” Joint Articulating surfaces
Acromial facet of the Clavicle with the medial aspect of the Acromion.
Acromioclavicular Joint Classification
Non-axial plane, synovial joint.
Acromioclavicular Joint Movements
Superior & Inferior scapula rotation, frontal plane, anterior posterior axis.
Protraction & Retraction of the scapula, roughly transverse plane AND axis.
Upward tilt/tip, sagittal plane, medial lateral axis.
Acromioclavicular Joint, Disc Ligament
Between the acromion and clavicle. Usually gone by 40 years old. Intracapsular.
Acromioclavicular joint, Capsule Ligament
Relatively weak, creates the joint capsule itself
Acromioclavicular Joint, Acromioclavicular Ligament
Extracapsular. Superior & inferior bands. Limits distraction (pull apart) and bone riding over bone.
Acromioclavicular Joint, Coracoclavicular Ligament
Extracapsular. Conoid & trapezoid ligaments. Transfers force from scapula to the clavicle during FOOSH (fall onto out stretched hand)
Acromioclavicular Joint, Superior Transverse Scapular Ligament
Extracapsular, DOES NOT CROSS AC JOINT. Spans the suprascapular notch. Nerve goes inferior to ligament, artery & vein go superior.
Acromioclavicular Joint, Bursae and Locations
NONE
Sternoclavicular Joint, Articulating Surfaces
Manubrium, sternal facet of clavicle, costal cartilage.
Sternoclavicular Joint, Costoclavicular Ligament
Extracapsular.
Costal cartilage of rib 1 to the impression for the costoclavicular ligament on the inferior clavicle.
Limits the pro & re-traction of the clavicle and limits elevation.
Sternoclavicular Joint, Interclavicular Ligament
Extracapsular.
Spans the sternal notch & attaches to medial clavicles.
Limits clavicular depression & elevation.
Sternoclavicular Joint, Joint Classifications
Bi-Axial.
Saddle* synovial joint.
*Some people consider it a double planar joint.
Sternoclavicular Joint, Movement plane & axis
Clavicular elevation & depression - Frontal Plane, Anterior Posterior axis.
Clavicular pro & re-traction - Transverse plane, vertical axis.
Clavicular Rotation - no plane, mechanical axis of clavicle.
Sternoclavicular Joint, Disc Ligament
Intracapsular.
Divides S.C. joint into 2 joint spaces (medial & lateral)
For shock absorption.
Sternoclavicular Joint, Capsule Ligament
Attaches medial clavicle, manubrium, and costal cartilage of 1st rib.
Sternoclavicular Joint, Sternoclavicular Ligament
Extracapsular with anterior & posterior bands.
Limits Ant & Post movement in clavicle.
Glenohumeral Joint, Coracoacromial Ligament
Extracapsular.
Forms the acromial arch.
Limits superior displacement of humeral head.
Glenohumeral Joint, Transverse Humeral Ligament.
Extracapsular
Does NOT CROSS GH JOINT!!
Secures long head biceps tendon into bicipital groove on humerus.
Glenohumeral Joint, Coracohumeral Ligament
2 bands, superior & inferior.
Extracapsular.
Supports dependent arm against gravity.
Restricts lateral rotation.
Glenohumeral Joint, GH Labrum
Intracapsular.
Lines the glenoid fossa on scapula.
Increases congruency by deepening fossa.
Glenohumeral Joint, Glenohumeral Ligament
Partially capsular.
3 band structure in a z shape. (Superior, Middle, Inferior)
Limits horizontal AB & AD, and external rotation.
Glenohumeral Joint, Capsule Ligament
Attaches rim of glenoid fossa to neck of the humerus.
Arms @ side (adduction), loose anterior posterior folds.
Taut in Abduction.
Glenohumeral Joint, name of all ligaments.
Capsule, Glenohumeral, GH Labrum, coracohumeral, transverse humeral, coracoacromial.
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Joints28
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Bones Intro (Lecture 1)35
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Upper Extremity Innervations21
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Joints and Ligaments - The Basics (Lecture 2)19
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Muscle Origins Forearm and Hand30
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Muscle Nerve Innervations Forearm and Hand30
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Muscle Insertions Forearm and Hand30
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Extensor Retinaculum Tendons In Forearm6
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Muscle Origins Shoulder and Upper Arm19
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Muscle Insertions Shoulder and Upper Arm20
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Muscle Actions Shoulder and Upper Arm20
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Muscle Nerves Shoulder and Upper Arm14
