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3 years ago

Which muscles move the arm

Health

2 answers:

lesya692 [45]3 years ago

4 0

The pectoralis major, lassimus doris, deltord, and rotator cuff muscles connect to humerus and move the arm

kompoz [17]3 years ago

3 0

Answer:

1- common origin for muscles that move the arm

scapula (except latissimus dorsi and pectoralis major)

2- common insertion for muscles that move the arm

humerus (except latissimus dorsi and pectoralis major)

3- common innervation of muscles that move the arm

cervical nerves

4- coracobrachialis

origin: scapula

insertion: humerus

innervation: cervical nerve

action: adduction and flexion of shoulder

5- deltoid

origin: scapula

insertion: humerus

innervation: cervical nerve

action: abduction of shoulder

-anterior- flexion and medial rotation of shoulder

-posterior- extension and lateral rotation of shoulder

6- supraspinatus muscle

origin: scapula

insertion: humerus

innervation: cervical nerve

action: abduction at shoulder

7- infraspinatus muscle

origin: scapula

insertion: humerus

innervation: cervical nerve

action: lateral rotation of shoulder

8- subscapularis

origin: scapula

insertion: humerus

innervation: cervical nerve

action: medial rotation of the shoulder

9- teres major and minor

origin: scapula

insertion: humerus

innervation: cervical nerve

actions

-major: extension and medial rotation of shoulder

-minor: lateral rotation and adduction of shoulder

10- triceps brachii (long head)

origin: scapula

insertion: humerus

innervation: cervical nerve

action: extension at the elbow

11- latissimus dorsi

origin: spinous process T7-T12

insertion: intertubercular groove of humerus

innervation: cervical nerve

action: abduction and medial rotation of shoulder

12- pectoralis major

origin: clavicle and sternum

insertion: intertubercular groove of humerus

innervation: cervical nerve

action: flexion, extension, adduction, medially rotate arm at shoulder

13- origin of latissimus dorsi

spinous process C7-C12

14- insertion of latissimus dorsi

intertubercular groove of humerus

15- action of latissimus dorsi

abduction and medially rotate shoulder

16- origin of pectoralis major

clavicle and sternum

17- insertion of pectoralis major

intertubercular groove

18- action of pectoralis major

flexion, extension, medial rotation, adduction of shoulder

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