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Scapular region, brachial plexus, axilla
(dissector pages 24-26, 30-34)
Terms in this set (23)
name the six shoulder (scapulohumeral muscles)
deltoid, supraspinatus, infraspinatus, teres minor, teres major, and subscapularis.
of these, which four arise from the posterior surface of the scapula?
supraspinatus, infraspinatus, teres major, and teres minor
which is more medial? the acromion or the coracoid process
the coracoid process
which is more medial when the humerus is in anatomical position? the greater or lesser tubercle?
the lesser tubercle
which is more distal? the surgical or anatomical neck of the humerus?
the surgical neck
Name the three proximal and 1 distal attachment of the deltoid
spine of the scapula, acromion, and lateral one third of the clavicle, and then distally to the deltoid tuberosity on the humerus
when you reflect the deltoid inferiorly, what three things will you find coming through the quadrangular space?
the axillary nerve, and posterior circumflex humeral artery (direct branch off the third part of the axillary a.) and vein.
The deltoid and teres minor are innervated by what nerve?
the axillary nerve
define the borders of the quadrangular space
superior by the inferior border of the teres minor, laterall by the surgical neck of the humerus, medially by the lateral border of the long head of the triceps, and inferiorly by the superior border of teres major.
describe the anterior/posterior relationships of the long head of the triceps to the teres major and minor mm.
passes posterior (over) the teres major, but anterior (under) to teres minor.
Describe the relation of teres major to the axillary nerve and posterior humeral circumflex artery
passes medial to the axillary nerve, and posterior to the posterior humeral circumflex artery
name the proximal attachment of the long head of the triceps
the infraglenoid tubercle of the scapula
Name the attachments and action of the teres minor
medially to the upper 2/3 of the lateral border of the scapula, laterally to the inferior facet of the greater tubercle of the humerus. (wraps behind the humerus) Acts to laterally rotate the humerus.
Do the same for the teres major
medially to the inferior angle of the scapula, laterally to the medial lip of the intertubercular sulcus of the humerus (wraps in front of the humerus) Acts to medially rotate and adduct the humerus.
Define the borders of the triangular space
superiorly by the inferior border of teres minor, laterally by the medial border of the long head of the triceps, inferiorly by the superior border of teres major
what will you find deep in the triangular space?
the circumflex scapular artery (branch of the subscapular artery off the thrid part of the axillary a.)
Name the medial and lateral attachments, innervation, and action of the supraspinatus muscle
medial on the supraspinous fossa of the scapula, lateral to the highest facet of the greater tubercle of the humerus, acts to initiate abduction humerus, and is innervated by the suprascapular nerve.
Do the same for the infraspinatus muscle
medial on the infraspinatous fossa of the scapula, lateral to the middle facet of the greater tubercle of the humerus, acts to laterally rotate the humerus, and is innervated by the suprascapular nerve
what muscle must you reflect to see the suprascapular artery and nerve?
the supraspinatus muscle ya dingo
what ligament runs over top of the suprascapular notch to form the suprascapular foramen?
the superior transverse scapular ligament
of the suprascapular artery and nerve, which runs over and which runs under the superior transverse scapular ligament?
the artery goes over, the nerve goes under
(army over the bridge, navy under it)
to reach the infraspinatus muscle, do the suprascapular artery and nerve pass deep or superficial to the spine of the scapula?
deep to it (anterior)
name the four rotator cuff muscles and their lateral attachments
the supraspinatus to the highest facet of the greater tubercle of the humerus (iniates abduction), the infraspinatus to the middle facet of the greater tubercle (lateral rotation), the teres minor to the inferior facet of the greater tubercle (lateral rotation), subscapularis to the lesser tubercle of the humerus (medial rotation and adduction)
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