back anatomy Flashcards

1
Q

Name the 5 superficial back muscles.

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

What is the innervation of trapezius?

A

Cn 11 - accessory

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3
Q

What is the action of trapezius?

A

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

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4
Q

Which rhomboid muscle lies most superiorly?

A

Rhomboid minor lies superior to major.

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5
Q

Name the 4 rotator cuff muscles.

A
  1. Supraspinatus
  2. Infraspinatus
  3. Subscapularis
  4. Teres minor
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6
Q

What is the function of the rotator cuff muscles?

A

To give the shoulder joint additional stability.

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7
Q

Where do the rotator cuff muscles originate from and insert?

A

Origin: scapula, insertion: humeral head.

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8
Q

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

A

Because it can stretch the axillary nerve.

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9
Q

What is the insertion of deltoid?

A

Deltoid tuberosity of the humerus.

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10
Q

What is the function of deltoid?

A

To abduct, flex and extend the arm.

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