Shoulder joint

 

Shoulder joint

Q. 1

Which of the following is true of shoulder joint?

 A Composed of only 2 joints
 B Anterior posterior gliding of s capula of never occurs
 C Acromio clavicular joint is more important
 D Allows flexion, rotation and abduction

Q. 1

Which of the following is true of shoulder joint?

 A Composed of only 2 joints
 B Anterior posterior gliding of s capula of never occurs
 C Acromio clavicular joint is more important
 D Allows flexion, rotation and abduction
Ans.D

Explanation:

D i.e. Allows flexion, rotation & abduction

• The three joints in shoulder complex are sternoclavicular, acromioclavicular, and gleno- humeral joints.
• The glenohumeral joint is a synovial ball and socket articulation between the head of the humerus and glenoid cavity of scapula. It is the most important joint of shoulder complexQ. Movements at this joint includes flexion, extension, abduction, adduction, medial rotation, lateral rotation and circumductionQ.
• Sternoclavicular & acromioclavicular joints allow movements in antero posterior and vertical planes to gether with some axial rotation.
• For every 3° abduction of arm, a 2° abduction occurs in the shoulder joint, and 1° occurs by rotation of scapula. At about 120°of abduction, the greater tuberosity of humerus hits the lateral edge of the acromian. Movements of scapula include rotation and anteroposterior glidingQ


Q. 2

Weakest portion of shoulder joint capsule is:

 A Anterior
 B Posterior
 C Inferior
 D Superior

Q. 2

Weakest portion of shoulder joint capsule is:

 A Anterior
 B Posterior
 C Inferior
 D Superior
Ans.C

Explanation:

C i.e. Inferior

• The inferior part of shoulder joint capsule is the weakest areaQ *
• When the shoulder joint is abducted, the lower surface of humerus head is supported by long head of triceps, which bows down- wards because of its length and gives little actual support to the humerus.


Q. 3

Muscle crossing through the shoulder joint is:

 A Biceps short head
 B Biceps long head
 C Triceps long head
 D Coracobrachialis

Q. 3

Muscle crossing through the shoulder joint is:

 A Biceps short head
 B Biceps long head
 C Triceps long head
 D Coracobrachialis
Ans.B

Explanation:

B i.e. Biceps long head

The tendon of the long head of biceps brachii muscle passes superiorly through the jointQ and restricts upward movement of humeral head on glenoid cavity.


Q. 4

‘Dynamic stabilizer of shoulder joint’ term is used for:

 A Rotator cuff
 B Glenoid labrum
 C Coracohumeral ligament
 D Glenohumeral ligament

Q. 4

‘Dynamic stabilizer of shoulder joint’ term is used for:

 A Rotator cuff
 B Glenoid labrum
 C Coracohumeral ligament
 D Glenohumeral ligament
Ans.A

Explanation:

Ans. a. Rotator cuff

`Dynamic stabilizer of shoulder joint’ term is used for rotator cuff or musculotendinous cuff

The rotator cuff is the name given to the tendons of the subscapularis, supraspinatus, infraspinatus, and teres minor muscles, which are fused to the underlying capsule of the shoulder joint. The cuff plays a very important role in stabilizing the shoulder joinQ. The tone of these muscles assists in holding the head of the humerus in the glenoid cavity of the scapula during movements at the shoulder joint. The cuff lies on the anterior, superior, and posterior aspects of the joint. The cuff is deficient inferiorly, and this is a site of potential weakness.’- Snells 8/e

Musculotendinous Cuff of the Shoulder or Rotator Cuff

  • Fibrous sheath formed by four flattened tendons, which blend with the capsule of the shoulderjoint and strengthen it. The cuff plays a very important role in stabilizing the shoulder jointQ.
  • The muscles which form the cuff arise from the scapula and are inserted into the lesser and greater tubercles of humerus.
  • Muscles of rotator cuff.
  1. SubscapularisQ
  2. SupraspinatusQ
  3. InfraspinatusQ
  4. Teres minorQ
  • Their tendons while crossing the shoulder joint become flattened and blend with each other on one hand, and with the capsule of joint on the other hand, before reaching their points of insertion.
  • The cuff lies on the anterior, superior, and posterior aspects of the joint. The cuff is deficient inferiorly, and this is a site of potential weakness.


×

 

 

 

 

Will you help me by Sharing this Quiz on Facebook ??

 

Leave a Reply

Free Mini Course on Stomach

Mini Course – Stomach

22 High Yield Topics in Stomach

in Just 2 Hours

Submission received, thank you!

Close Window
%d bloggers like this:
Malcare WordPress Security