Muscles of Pectoral and Scapular Region 2024 PDF

The Back and Scapular region Dr. Silvia Boyajian Muscles Connecting the Upper Limb to the Vertebral Column  I lady between twomajor  Trapeziussh trapezius isaccording to shape shape ❑ Origin: cranial...

The Back and Scapular region Dr. Silvia Boyajian Muscles Connecting the Upper Limb to the Vertebral Column  I lady between twomajor  Trapeziussh trapezius isaccording to shape shape ❑ Origin: cranial - N. N1 Motor nerve Occipital bone(external occiptal > C3, C4 Sensory protuberunce), Superior nuchal line Ligamentum nuchae Spine of seventh cervical vertebra Spines of all thoracic vertebrae and their supraspinous ligament ❑ Insertion: Upper fibers into lateral third of clavicle middle and lower fibers into acromion and spine of scapula of spine of the scapulace aspect -> Iner & iner aspect 81ss15 ❑ Nerve Supply: Spinal part of (XI cranial nerve) accessory nerve (motor) and C3 and 4 (sensory) ❑ Action: Upper fibers elevate the scapula; middle fibers pull scapula medially (retracts); lower fibers pull medial border of scapula downward  Latissimus dorsi ❑ Origin: Iliac crest lumbar fascia spines of lower six thoracic vertebrae(T7-T12) lower three or four ribs # inferior angle of scapula O T7 inferior angle of the scapulae ❑ Insertion: Floor of bicipital groove of humerus ❑ Nerve Supply: Thoracodorsal nerve ❑ Action: Extends, adducts, and medially rotates the arm ** gbie,s's Its called the climbing muscle Raising of the trunk above the arm  Levator scapulae action of the muscle ❑ Origin: Transverse processes of first fourth cervical vertebrae ❑ Insertion: Medial border of scapula ❑ Nerve supply: C3 and 4 and dorsal scapular nerve (C5) E ❑ Action: Raises medial border of scapula (Elevates the scapula) Rhomboid minor ❑ Origin: Ligamentum nuchae and spines of seventh cervical (C7) and first thoracic vertebrae (T1) ❑ Insertion: Medial border of scapula ❑ Nerve supply: C Dorsal scapular nerve (C4, 5) ❑ Action: Raises medial border of scapula upward and medially (elevates and retracts the scapula)  Rhomboid major ❑ Origin: Second to fifth thoracic spines ❑ Insertion: Medial border of scapula ❑ Nerve supply: ·f Dorsal scapular nerve (C4, 5) C4 25 ❑ Action: Raises medial border of scapula Medial border of scapular) & insersion > Sixi, X upward and medially (elevates and & levator scapule retracts the scapula) ② Rhomboid Major ③ Rhomboid Minor Muscles Connecting the Upper limb to the Trunk (anterior group)  Pectoralis Major one of the walls of I Diceptal groove ❑ Origin: Clavicular head: anterior surface of medial half of clavicle Sternocostal head: anterior surface of sternum, first six costal cartilages, aponeurosis of external oblique muscle ⑪ - ❑ Insertion: ② - Lateral lip of intertubercular sulcus of humerus - ❑ Nerve supply: Lateral and medial pectoral nerves; clavicular head (C5, C6), sternocostal head (C7, C8, T1) La adduction, ❑ Action: Medialrotations Flexes, adducts and medially rotates humerus Flexion Clavicular head flexion of extended arm Sternocostal head extends it from the flexed position j1 anteriorlyi s.At