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15 Cards in this Set
- Front
- Back
Trapezius
origin: skull and thoracic vertebrae insertion: clavicle and scapula shape: trapezium - divided into 3 sections (a) descending convergent fibres, superior; (b) transverse fibres, middle; (c) ascending convergent fibres, inferior Layer: most superior layer of shoulder region Group: superficial posterior (shoulder) group Function: 1) descending part (superior) - elevate scapula 2) middle part - retracts scapula (pull posteriorly) 3) Ascending part (inferior) - descend scapula 4) ascending + descending = rotate glenoid cavity posteriorly |
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Rhomboid minor
origin: cervical and thoracic vertebrae insertion: medial border of scapula shape: flat, rhomboid; descending parallel fibres layer: superior to rhomboid major, under trapezius Group: superficial posterior (shoulder) group Function: retract scapula, rotate/depress glenoid cavity fix scapula to thoracic wall |
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Rhomboideus Major
origin: cervical and thoracic vertebrae insertion: medial border of scapula shape: flat, rhomboid; descending parallel fibres Group: superficial posterior (shoulder) group position: inferior to rhomboid minor, under trapezius Function: retract scapula, rotate/depress glenoid cavity fix scapula to thoracic wall |
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Levator Scapulae
origin: cervical vertebrae insertion: superior scapula group: superficial posterior (shoulder) group innervation: position: next to subscapularis, under trapezius joint: function: + descending parts of trapezius = elevate scapula/fix against thoracic wall extend neck (bilaterally with trapezius) contribute to lateral flexion of neck (unilateral contraction) |
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Latissimus Dorsi
origin: lumbar and thoracic vertebrae insertion: anterior proximal humerus group: superficial posterior group innervation: position: most superficial lower back muscle Function: extends, retracts and rotates the humerus medially (directly at glenohumeral joint; indirectly at pectoral girdle - clavicle, scapula, scapulothoracic joint) |
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Teres Major
origin: inferior angle of scapula (posterior surface) insertion: anterior proximal humerus group: superficial posterior (shoulder) group innervation: Axillary nerve blood supply: drain into: position: inferior to teres minor and infraspinatus, under or lateral to trapezius Function: adducts and medially rotates the arm, important stabilizer of humerus head in glenoid cavity |
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Teres Minor
origin: laterial border of scapula insertion: greater tubercle of humerus group: deep rotator cuff group; posterior innervation: axillary nerve blood supply: drain into: position: superior to teres major, under trapezius and superficial to infraspinatus joint: glenohumeral joint function: 1) dynamic ligament: keep head of humerus in socket and stabilize joint throughout wide range of movement 2) rotate humerus: lateral rotation (infraspinatus + teres minor) |
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Supraspinatus
origin: supraspinous fossa of scapula insertion: greater tubercle of humerus group: deep rotator cuff group innervation: position: above the spine of of scapula (as named), under trapezius (but both anterior and posterior) Function: 1) Dynamic ligament: keep head of humerus in socket and stabilize joint throughout wide range of movement 2) Assist abduction (away from midline) |
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Subscapularis
origin: subscapular fossa of scapula insertion: lesser tubercle of humerus group: deep rotator cuff group innervation: position: anterior; under rhomboid minor and pectoralis major Function: 1) Dynamic ligament - keep head of humerus in socket and stabilize joint throughout wide range of movement 2) rotate humerus - medial rotation (glenohumeral joint) |
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Infraspinatus
origin: infraspinous fossa of scapula insertion: greater tubercle of humerus group: deep rotator cuff group; posterior innervation: position: posterior below spine of scapula, below teres minor, superior to teres major Function: 1) Dynamic ligament - keep head of humerus in socket and stabilize joint throughout wide range of movement 2) rotate humerus - lateral rotation (infraspinatus + teres minor; glenohumeral joint) |
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Deltoid
origin: lateral clavicles, acromion, spine of scapula insertion: proximal, lateral humerus (deltoid tuberosity of humerus) group: anterior and lateral group innervation: Axillary nerve blood supply: drain into: position: most superficial proximal humerus and shoulder region; divided in three sections - clavicular (anterior; superior, next to pectoralis major), acromial (middle) and spinal (posterior, on top of infraspinatus) part. Cephalic vein in deltopectoral groove Function: 1) anterior (clavicular): flexes and medially rotates arm (glenohumeral joint) 2) middle ( acromial): abducts arm (away from midline) 3) posterior (spinal): extends and laterally rotates arm |
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Pectoralis Major
origin: sternum, rib cartilages, clavicle insertion: greater tubercle of humerus Group: superficial anterior and lateral group innervation: blood supply: drain into: position: most superficial anterior muscle, inferior to clavicle and deltoid muscle. Cephalic vein in deltopectoral groove. function: adducts and medially rotates humerus, draws scapula anteriorly and inferiorly |
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Coracobrachialis
origin: coracoid process of scapula insertion: medial margins of the humerus shaft group: flexor (anterior) arm group innervation: musculocutaneous nerve blood supply: brachial artery drain into: position: under biceps brachii, exposed at medial humerus close to armpit region Function: flex and adduct arm (glenohumeral joint), stabilise glenohumeral joint (shunt muscle) |
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Triceps Brachii (lateral head, long head, medial head)
origin: insertion: group: extensor arm innervation: radial nerve blood supply: deep brachial artery drain into: location: Function: |
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Supinator
origin: insertion: group: deep extensor (posteriolateral) forearm innervation: radial nerve blood supply: drain into: location: Function: |
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