-
muscles of the shoulder:
- coracobrachialis
- teres major
- deltoid
-
attachment & function of the coracobrachialis:
- attaches coracoid process to humerus
- function: to flex, internally rotate
runs from scapula to humerus
-
attachment and function of the teres major:
- attaches to scapula & internal aspect of humerus (crest of lesser tubercle)
- function: adductor of humerus
-
attachment and function of the deltoid:
- arises from the spine of the scapula, acromium, & lateral 1/3rd of clavicle & inserts on deltoid tuberosity
- funct: (3D arm swing)
- ant fibers: flexors
- post fibers: extensors
- lateral fibers: abductors
-
attachment and function of serratus anterior:
- attaches to 1st 8 ribs & the medial underside border of the scapula
- funct: protraction (whole muscle)
-
4 muscles that attach to back of scapula:
- levator scapula
- rhomboid major & minor
- trapezius
- pec minor
-
function of the levator scapula:
ipsilaterally elevate the scapular
-
if scapula was held in check & levator scapula contracted what would happen:
extension & lateral flexion
-
attachment & funct of rhomboid minor & major:
- c4-T5 & to medial border of scapula
- funct: to elevate & retract the scapula
-
attachment and function of the trapezius:
- upper part attaches to occiput, nuchal ligament, & from T1-T3 in the midline, & lateral 1/3 of the clavicle
- lower part attaches T4-T12 & converges to attach on lower edge of the spine of the scapula
- funct: when whole trap contracts: retracts scapula.
- when upper part contracts: elevates scapula
-
attachment & function of pec minor:
- attaches from 2-4 ribs to the coronoid process
- funct: depresses scapula
-
attachment & function of subclavius:
- attaches 1st rib to clavicle
- funct: debatable, but stabilizes clavicle to 1st rib
-
attachment & function of omohyoid:
- attaches hyoid bone & inserts on upper edge of spine of scapula
- funct: depress hyoid bone & larynx
-
what are the 3 large external muscles:
- pec major
- lat dorsi
- deltoid
-
what 2 muscles define the posterior & anterior borders of the axilla?
pec major and the lat dorsi
-
attachment and function of the pec major:
- attaches from lateral border of the sternum, medial 1/3rd of clavicle & 2nd-6th costal cartilages & inserting on anterior edge of bicipital groove
- funct: adductor of the humerus
- when adducting is held in check it also produces internal rotation of humerus
-
attachment and function of the lat:
- arising under the tail of the trap from T7-sacrum & posterior aspect of iliac crest & some fibers arising from lower 4 ribs (& occasionally tip of scapula) & inserts on posterior edge of bicipital groove
- funct: adductor of humerus, depressor of scapula
-
describe the fiber arrangement of the lat:
the inferior fibers become the superior fibers. it spirals around & under Teres major
-
attachment and function of the deltoid:
- arises from spine of scapula, acromium, & lateral 1/3rd of clavicle & inserts on deltoid tuberosity
- funct: (3D arm swing)
- ant fibers: flexors
- post fibers: extensors
- lat fibers: abductors
|
|
