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lab practical 1
AOIN of muscles
| Term | Definition |
|---|---|
| pectoralis major origins | clavicular portion- clavicle, sternal-costal portion- sternum and upper ribs, abdominal portion- tendon of external oblique muscle |
| pectoralis major insertion | greater tubercle/lateral side of intertubercular groove on humerus |
| actions of pecotoralis major | clavicular portion- flexes humerus at shoulder joint, sternocostal portion- extends humerus at shoulder joint, entire mudcle- adduction and medial rotation of humerus, elevated ribs in forced respiration when humerus is fixed |
| nerve supply to pectoralis major | medial pectoral nerve, lateral pectoral nerve |
| pectoralis minor origin | ribs 3-5 |
| pectoralis minor insertion | coracoid process of scapula |
| pectoralis minor actions | involved with protraction/abduction of scapula, elevates ribs in forced respiration |
| nerve supply to pectoralis minor | medial pectoral nerve |
| subclavius origin | first rib |
| subclavius insertion | subclavian groove of clavicle |
| subclavius actions | pulls clavicle medially, acts as a protective cushion between clavicle and subclavian blood vessels |
| nerve supply to subclavius | nerve to the subclavius |
| trapezius origins | superior nuchel line/occiput, external occipital protuberance, ligamentum nuchae, spines of C7-T12 |
| trapezius insertions | clavicle, acromion process of spine of scapula |
| trapezius actions | stabilizes scapula, upper portion- elevates scapula, middle/lower portions- adducts and depresses scapula |
| nerve supply to trapezius | motor- spinal accessory nerve, censory- C3,C4 |
| rhomboid major origin | spines of upper thoracics |
| rhomboid major insertion | vertebral border of scapula |
| rhomboid major actions | elevates/adducts scapula, helps stabilize scapula |
| rhomboid major nerve supply | dorsal scapular nerve |
| rhomboid minor origin | spines of C7,T1 |
| rhomboid minor insertion | vertebral border of scapula |
| rhomboid minor actions | elevates/adducts scapula, helps stabilize scapula |
| rhomboid minor nerve supply | dorsal scapular nerve |
| levator scapula origins | transverse process/upper cervical vertebrae |
| levator scpula insertions | upper medial border and superior angle of scapula |
| levator scapula actions | elevate scapula, adducts scapula, stabilize scapula |
| nerve supply to levator scapula | dorsal scapular nerve |
| latissimus dorsi origins | spines of lower thoracic and lumbar vertebrae, thoracodorsal fascia, crest of the ilium, lower ribs |
| latissimus dorsi insertion | medial side of intertubercular groove/lesser tubercle |
| latissimus dorsi actions | extends/adducts/medially rotates humerus, involved in forced respiration |
| nerve supply to latissimus dorsi | thoracodorsal nerve |
| serratus anterior origin | upper 8 or 9 ribs |
| serratus anterior insertion | vertebral border of scapula |
| serratus anterior actions | abduction/protraction of scapula, stabilizes scapula, involved in forced respiration |
| nerve supply to serratus anterior | long thoracic nerve |
Created by:
segulls
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