USMLE Step 1 Review 01 21 Anatomy Rotator Cuff Muscles

USMLE Step 1 Review 01 21 Anatomy Rotator Cuff Muscles

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Let’s continue our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.

Play USMLE Audio MP3 01 21 Anatomy Rotator Cuff Muscles Below

 

Begin 01 21 Anatomy Rotator Cuff Muscles Transcription

The key concept here is what?

  • There are four muscles and they originate from the scapula. These four muscles split into two groups, a group of three and a group of one.

How are these groups made up?

  • The group of three are all posterior to the scapula, while the other one is anterior to the scapula.

What is the muscle anterior to the scapula?

  • Subscapularis.

And what are the three muscles posterior to the scapula?

  • From cranial to caudal- supraspinatus, infrapsinatus and teres minor.

Which muscles insert onto the anterior surface of the humerus near the head?

  • Subscapularis.

Which muscles passes under the acromion on its way to insert onto a posterior surface of the humers?

  • Supraspinatus.

And what is the nerve supplying supraspinatus?

  • The suprascapular nerve.

What’s the nerve supplying infraspinatus?

  • The suprascapular nerve.

What is the nerve supplying teres minor?

  • The axillary nerve.

What nerve supplies subscapularis?

  • Upper and lower subscapular nerves.

Let’s do a little preparation for the brachial plexus. This time give the nerve and then give where is comes from in the brachial plexus.

The nerve supplying supraspinatus?

  • Suprascapular nerve from the superior trunk of the brachial plexus.

Nerve supplying infraspinatus?

  • Suprascapular nerve here, too.

The nerve supplying teres minor muscle?

  • Axillary nerve, a terminal branch from the middle cord of the brachial plexus.

And the nerve supplying subscapularis?

  • Two nerves, the upper and lower subscapular nerves from the middle cord of the brachial plexus.

Student-doctor, please pause the tape and summarize for the rotator cuff.

  • The rotator cuff muscles are the supraspinatus, the infraspinatus and the teres minor on the posterior aspect of the scapula and the subscapularis muscle on the anterior aspect of the scapula. The supraspinatus is innervated by the suprascapular nerve from the superior trunk of the brachial plexus. The infraspinatus is also innervated by the suprascapular nerve from the superior trunk of the brachial plexus. Teres minor is innervated by the axillary nerve, which is a terminal division from the middle cord of the brachial plexus. And subscapularis is innervated by two nerves, upper and lower subscapular from the middle cord of the brachial plexus.

****END OF TRANSCRIPTION****

 

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