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ASMT- A&P2 #2
Muscles of the Shoulder
| Question | Answer |
|---|---|
| Supraspinatus (origin) | supraspinatus fossa |
| Supraspinatus (insertion) | superior portion of greater tubercle |
| Supraspinatus (structure/relationship) | most frequently injured rotator cuff mm, runs inferior to the acromion process |
| Infraspinatus (origin) | ifraspinatus fossa |
| Infraspinatus (insertion) | posterior portion of greater tubercle |
| Infraspinatus (function) | lateral rotation |
| Infraspinatus (structure/relationship) | strongest lat. rotator, mostly deep to deltoid |
| Supraspinatus (function) | abduction (first 5-15 degrees) |
| Teres Minor (origin) | lateral margin of scapula |
| Teres Minor (insertion) | infra/posterior portion of the greater tubercle |
| Teres Minor (function) | lateral rotation, adduction |
| Teres Minor (structure/relationship) | completely deep to deltoid |
| Subscapularis (origin) | subscapular fossa |
| Subscapularis (insertion) | lesser tubercle |
| Subscapularis (function) | medial rotation |
| Subscapularis (structure/relationship) | found b/w serratus ant. and the scapula |
| Deltoid (origin) | lat. 1/3 of clavicle, acromin process, spine of scapula |
| Deltoid (insertion) | deltoid tubercle |
| Deltoid (function) | anterior- flexion & medial rotation, middle/lateral-abduction(takes over of sup. spinatus, posterior- extension & lat. rotation |
| Deltoid (structure/relationship) | only muscle that opposes itself, most superficial rotator cuff muscle, share attachment (of lat 1/3 of clavicle, acromion process, and spine of scapula) with trapezius |
| Pectoralis Major (origin) | medial 1/2 of clavicle & entire sternum |
| Pectoralis Major (insertion) | lateral ridge of intertubercular groove |
| Pectoralis Major (function) | medial rotation, flexion (if the arm is in hyperextension), adduction |
| Pectoralis Major (structure/relationship) | forms anterior wall of axillary space |
| Teres Major (origin) | inferior angle & lat margin of scapula |
| Teres Major (insertion) | medial ridge of intertubercular groove |
| Teres Major (function) | adduction, medial rotation, extension (when arm is flexed) |
| Teres Major (structure/relationship) | inferior to teres minor |
| Latissimus Dorsi (origin) | SP of T7-L5, saccrum, iliac crest, and ribs 9-12 |
| Latissimus Dorsi (insertion) | floor of the intertubercular groove |
| Latissimus Dorsi (function) | adduction, extension from flexion, medial rotation |
| Latissimus Dorsi (structure/relationship) | most superficial muscle of the low back |
| Rotator Cuff Muscles | supraspinatus, infraspinatus, teres minor, subscapularis |
| Shoulder Cap Muscles | deltoids |
| Intertubercular Groove Muscles | pectoralis major, teres major, latissimus dorsi |
Created by:
Lizziewiz
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