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Bio 271 Exam 2 Questions With Complete Solutions

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Bio 271 Exam 2 Questions With Complete Solutions

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Bio 271 Exam 2 Questions With Complete Solutions

2 groups of muscles that move the GH joint Correct Answers
free movers and rotators/ retainers

4 rotator cuff muscles Correct Answers supraspinatus,
infraspinatus, teres minor, subscapularis

abduction of GH joint for 90 degrees requires Correct Answers
supraspinatus and lateral (middle) deltoid

abduction of GH joint to 180 degrees requires Correct Answers
external rotation of Humerus at GH joint (teres minor)
infraspinatus, posterior deltoid)
lateral rotation of scapula at AC joint (lower serratus anterior,
upper trapezius, lower trapezius)

adductors of the GH joint Correct Answers corachobrachialis
anterior deltoid
pectoralis major
teres major
latissimus dorsi
long head of triceps brachii
posterior deltoid

anterior deltoid Correct Answers O: lateral 1/3 of clavicle
I: anteriorly on deltoid tuberosity
N: axillary nerve

Coracobrachialis Correct Answers O: coracoid process
I: medially on humerus 1/2 the way down

, N: musculocutaneous nerve

Extensors of GH joint Correct Answers teres major
latissimus dorsi
long head of triceps brachii
posterior deltoid
lower pectorals major

external rotators of GH joint Correct Answers teres minor
infraspinatus
posterior deltoid

Flexors of the GH joint Correct Answers short head of the
biceps brachii
coracobrachialis
upper pectoralis major
anterior deltoid

free movers Correct Answers larger muscles involved in all
movements of the GH joint

infraspinatus Correct Answers O: infraspinous fossa
I: posteriorly on greater tubercle below supraspinatus
N: suprascapular nerve

internal rotators of GH joint Correct Answers subscapularis
teres major
latissimus dorsi
pectoralis major
anterior deltoid
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