back anatomy

Question 1

Name the 5 superficial back muscles.

Answer 1

1. Trapezius
2. Latissimus dorsi
3. Leavator scapuli superioris
4. Rhomboid minor
5. Rhomboid major

Question 2

What is the innervation of trapezius?

Answer 2

Cn 11 - accessory

Question 3

What is the action of trapezius?

Answer 3

Elevates the scapula and rotates it during abduction of the arm.

Question 4

Which rhomboid muscle lies most superiorly?

Answer 4

Rhomboid minor lies superior to major.

Question 5

Name the 4 rotator cuff muscles.

Answer 5

1. Supraspinatus
2. Infraspinatus
3. Subscapularis
4. Teres minor

Question 6

What is the function of the rotator cuff muscles?

Answer 6

To give the shoulder joint additional stability.

Question 7

Where do the rotator cuff muscles originate from and insert?

Answer 7

Origin: scapula, insertion: humeral head.

Question 8

Why can posterior dislocation of the shoulder result in deltoid weakness and numb skin above the deltoid tendon?

Answer 8

Because it can stretch the axillary nerve.

Question 9

What is the insertion of deltoid?

Answer 9

Deltoid tuberosity of the humerus.

Question 10

What is the function of deltoid?

Answer 10

To abduct, flex and extend the arm.