Upper Extremity Musculature. Shoulder Complex Scapula Scapula Clacivle Clacivle Sternum Sternum...
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Transcript of Upper Extremity Musculature. Shoulder Complex Scapula Scapula Clacivle Clacivle Sternum Sternum...
Shoulder ComplexShoulder Complex ScapulaScapula ClacivleClacivle SternumSternum HumerusHumerus Rib CageRib Cage Sternoclavicular JointSternoclavicular Joint Acromioclavicular JointAcromioclavicular Joint Glenohumeral JointGlenohumeral Joint Scapulothoracic Joint / ArticulationScapulothoracic Joint / Articulation
Shoulder GirdleShoulder Girdle
Motions available at the shoulder girdle are Motions available at the shoulder girdle are upward rotation, protraction, downward upward rotation, protraction, downward rotation, retraction, and scapular tilt (when rotation, retraction, and scapular tilt (when the shoulder enters hyperextension)the shoulder enters hyperextension)
Scapulohumeral rhythm: The first 30 Scapulohumeral rhythm: The first 30 degrees of shoulder joint motion is pure GH degrees of shoulder joint motion is pure GH motion. After the initial 30 degrees, for motion. After the initial 30 degrees, for every 2 degrees of shoulder flexion or every 2 degrees of shoulder flexion or abduction, the scapula must upwardly abduction, the scapula must upwardly rotate 1 degree. This results in a 2:1 ratio.rotate 1 degree. This results in a 2:1 ratio.
Scapulothoracic JointScapulothoracic Joint
Articulation of scapula with thorax Articulation of scapula with thorax Not a true jointNot a true joint Muscles associated with ST Joint Muscles associated with ST Joint
(shoulder girdle)(shoulder girdle) TrapeziusTrapezius Rhomboid MajorRhomboid Major Rhomboid MinorRhomboid Minor Levator ScapulaeLevator Scapulae Serratus AnteriorSerratus Anterior Pectoralis MinorPectoralis Minor
Upper TrapeziusUpper Trapezius
Origin Origin Occipital Bone, nuchal ligament Occipital Bone, nuchal ligament on cervical spinous processeson cervical spinous processes
Insertion Insertion Lateral third of clavicle, Lateral third of clavicle, acromion processacromion process
Action Action Scapular elevation and upward Scapular elevation and upward rotationrotation
Innervation Innervation Spinal accessory (cranial Spinal accessory (cranial nerve XI), C3-C4 sensory componentnerve XI), C3-C4 sensory component
Middle TrapeziusMiddle Trapezius
Origin Spinous processes of C7 Origin Spinous processes of C7 through T3through T3
Insertion Scapular spineInsertion Scapular spine Action Scapular retractionAction Scapular retraction Innervation Spinal accessory Innervation Spinal accessory
( cranial nerve XI), C3 and C4 ( cranial nerve XI), C3 and C4 sensory componentsensory component
Lower TrapeziusLower Trapezius
Origin Spinous processes of middle Origin Spinous processes of middle and lower thoracic vertebraeand lower thoracic vertebrae
Insertion Base of the scapular spineInsertion Base of the scapular spine Action Scapular depression and Action Scapular depression and
upward rotationupward rotation Innervation Spinal accessory Innervation Spinal accessory
( cranial nerve XI), C3 and C4 ( cranial nerve XI), C3 and C4 sensory componentsensory component
RhomboidsRhomboids
Origin Origin Spinous processes of C7 Spinous processes of C7 through T5through T5
Insertion Insertion Medial border of scapula Medial border of scapula from level of spine to inferior anglefrom level of spine to inferior angle
Action Action Scapular retraction, Scapular retraction, elevation and downward rotationelevation and downward rotation
Innervation Innervation Dorsal scapular nerve Dorsal scapular nerve (C5)(C5)
Levator ScapulaeLevator Scapulae
Origin Origin Transverse processes of C1 - C4 Transverse processes of C1 - C4 vertebraevertebrae
Insertion Insertion Vertebral border of scapula Vertebral border of scapula between the superior angle and spinebetween the superior angle and spine
Action Action Scapular elevation and Scapular elevation and downward rotationdownward rotation
Innervation Innervation Third and fourth cervical Third and fourth cervical nerves and dorsal scapular nerve (C5)nerves and dorsal scapular nerve (C5)
Serratus AnteriorSerratus Anterior
Origin Origin Superolateral surfaces of Superolateral surfaces of upper 8 or 9 ribs at the side of chestupper 8 or 9 ribs at the side of chest
Insertion Insertion Vertebral border of Vertebral border of scapula, anterior surfacescapula, anterior surface
Action Action Scapular protraction and Scapular protraction and upward rotationupward rotation
Innervation Innervation Long thoracic nerve Long thoracic nerve (C5, C6, C7)(C5, C6, C7)
Pectoralis MinorPectoralis Minor
Origin Origin 3rd to 5th ribs, anterior 3rd to 5th ribs, anterior surfacesurface
Insertion Insertion Coracoid process of the Coracoid process of the scapulascapula
Action Action Scapular depression, Scapular depression, protraction, downward rotation, and protraction, downward rotation, and tilttilt
Innervation Innervation Medial pectoral nerve Medial pectoral nerve (C8, T1)(C8, T1)