Upper back, Shoulder, Chest

Rhomboid Major and Rhomboid Minor Anatomy: Origin, Insertion, Action

Rhomboid Major and Rhomboid Minor Muscles Anatomy Study: Origin, Insertion, Action, Innervation and Blood Supply Rhomboid Major Origin: Spinous processes of T2 – T5 Insertion: Vertebral border of the scapula, from inferior to the scapular spine to the inferior angle Action: Retraction of the scapula, downward rotation of the scapula Innervation: Dorsal scapular nerve C5…

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Diaphragm Muscle Anatomy: Origin, Insertion, Action and Innervation

Diaphragm Muscle Anatomy Study: Origin, Insertion, Action and Innervation Origin: Attaches to the sternum and xiphoid process anteriorly, the L1 through the L3 lumbar vertebrae and the arcuate ligaments posteriorly, and the costal margin peripherally. Insertion: Attaches to the central aponeurotic tendon Action: Inspiration Innervation: Phrenic, inferior phrenic, subcostal and inferior six – seven intercostal…

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Intercostal Muscles Anatomy: Origin, Insertion, Action, Innervation

Intercostal muscles are the muscles between the ribs.

Intercostal Muscles Anatomy Study: Origin, Insertion, Action and Innervation Origin: From the first to the eleventh ribs, on the inner surface and inferior border, from the tubercles of the rib posteriorly to the costocartilage anteriorly. Insertion: The rib immediately below the level of proximal attachment, on its superior surface. Action: Draw adjacent ribs together, elevate…

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Serratus Posterior Superior Anatomy: Origin, Insertion, Action, Innervation

Serratus Posterior Superior Muscle

Serratus Posterior Superior Anatomy Study: Origin, Insertion, Action and Innervation Origin: Lower part of the nuchal ligament and the spinous processes of the vertebrae C7 through T3 and their corresponding supraspinous ligaments Insertion: Superior borders and external surfaces of the second to fifth ribs, lateral to their angles Action: Elevate the ribs which aids in inspiration Innervation:…

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Trapezius Anatomy Study: Origin, Insertion, Action and Innervation

Trapezius muscle connects the neck, shoulder and upper back.

Trapezius Anatomy Study: Origin, Insertion, Action and Innervation Origin: Upper part: External occipital proturberance, medial third of the superior nuchal line, the ligamentum nuchae,  and the spinous process of C7 Medial Part: Spinous processes of T1 to T5. Lower Part: Spinous processes of T6 to T12 Insertion: Upper Part: Lateral third of the clavicle and the…

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Serratus Anterior Anatomy: Origin, Insertion, Action, Innervation

Serratus Anterior Muscle

Serratus Anterior Anatomy Study: Origin, Insertion, Action and Innervation Origin: Fleshy slips from the lateral aspect of the superior eight ribs and anterior intercostal membranes from the midclavicular line, the lower four slips interdigitating with external abdominal oblique Insertion: Volar surface of the axillary border of the scapula, spanning the superior and inferior angles Action: Protracts…

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Serratus Posterior Inferior Muscle Anatomy: Origin, Insertion, Actions, Innervation

Serratus Posterior Inferior Muscle Anatomy Study Origin: The spinous processes of the T11 to L2/L3 and their corresponding supraspinous ligaments, blending with the lumbar part of the thoracolumbar fascia. Insertion: Inferior borders and outer surfaces of the lower four ribs (9th -12th), lateral to their angles Action: Depresses the lower ribs aiding in expiration, Assists…

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Teres Minor Muscle Anatomy: Origin, Insertion, Action

Rotator Cuff Muscle Teres Minor

Anatomy Study: Origin, Insertion, Action and Innervation of the Teres Minor Muscle Origin: On the dorsal surface of the middle half of the lateral border of the scapula Insertion: The lowest of the three facets of the greater tubercle of the humerus Action: Externally rotates the arm Innervation: Axillary nerve (C5,6) Blood Supply: Scapular circumflex artery Synergist: Infraspinatus, Supraspinatus, Deltoid (posterior…

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Subscapularis Muscle Anatomy: Origin, Insertion, Action, Innervation

Subscapularis Muscle Anatomy Study: Origin, Insertion, Action and Innervation Origin: Medial two-thirds of  volar surface of the scapula Insertion: Lesser tubercle of humerus Action: Internally rotates humerus; Assists with depression of the humeral head Innervation: Upper and Lower Subscapular Nerve (C5,6) Blood Supply: Subscapular artery from the axillary artery Synergist: Teres major, Latissimus dorsi, and Pectoralis major Antagonist: Infraspinatus, Teres minor For Pain and Symptom…

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Supraspinatus Muscle Anatomy: Origin, Insertion, Action

Supraspinatus Muscle Anatomy Study: Origin, Insertion, Action and Innervation Origin: Supraspinous fossa of scapula Insertion: Superior facet of greater tubercle of humerus Action: Abduction of arm and stabilizes humerus Innervation: Suprascapular nerve (C5,6) Blood Supply: Suprascapular artery from the thyrocervical trunk and the dorsal scapular artery Synergist: Deltoid, Infraspinatus, Teres major and minor, Subscapularis. Antagonist: Pectoralis major and minor, Subclavius, Serratus anterior, Trapezius, Latissimus dorsi,…

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