Joint and Ligaments of the Shoulder

Question 1

Acromioclavicular Joint & Ligament

Answer 1

articulation between the acromion process of the scapula and the clavicle.

It allows for various shoulder movements, particularly those involving the raising of the arm and the coordinated movement of the scapula.

Question 2

Coracoacromial Ligament

Answer 2

spans between the coracoid process and the acromion process

Question 3

Coracoclavicular Ligament
(2 Parts)

Answer 3

The coracoclavicular ligament is a strong ligament that connects the coracoid process of the scapula to the clavicle.

The ligament is often divided into two parts: the conoid ligament (medial) and the trapezoid ligament (lateral).

Question 4

Costoclavicular Ligament
(Rhomboid Ligament)

Answer 4

Connection: This ligament extends from the first rib to the inferior aspect of the clavicle.

Function: The costoclavicular ligament helps stabilize the clavicle and limits its upward movement, particularly during movements that involve raising the arm.

Question 5

Interclavicular Ligament

Answer 5

It connects the sternal ends of the right and left clavicles, crossing over the superior part of the manubrium.

Question 6

Sternoclavicular Ligament

Answer 6

1. Anterior Sternoclavicular Ligament:
   
   • Location: This ligament is located anteriorly (in front) of the sternoclavicular joint.
   • Function: It helps prevent excessive movement and provides stability to the joint.
2. Posterior Sternoclavicular Ligament:
   
   • Location: Found posteriorly (behind) the sternoclavicular joint.
   • Function: Like the anterior ligament, it contributes to the stability of the joint.

Question 7

Scapulo-humeral Rhythm

Answer 7

The scapulo-humeral rhythm is a coordinated movement pattern between the shoulder blade (scapula) and the upper arm bone (humerus) during certain arm movements. This rhythm ensures smooth and stable motion of the shoulder joint, particularly during activities like raising the arm overhead.

Move at a 1:2 ratio

When the arm is abducted 180º, 60º occurs by rotation of scapula and 120º by rotation of the humerus

Question 8

Transverse humeral Ligament

Answer 8

The ligament spans across the intertubercular groove of the humerus.

Question 9

Glenohumeral Joint Ligaments

Answer 9

The glenohumeral ligaments are a group of ligaments associated with the glenohumeral joint, which is the ball-and-socket joint of the shoulder.

Question 10

Glenoid Labrum

Answer 10

The glenoid labrum is a ring of cartilage that surrounds the shallow socket (glenoid) of the shoulder joint. It acts like a bumper, providing stability and cushioning to the joint and enhancing the fit for the head of the humerus (upper arm bone). The labrum plays a crucial role in maintaining shoulder stability and supporting various arm movements.

Question 11

Answer 11

Question 12

Answer 12

Question 13

Whata are the 3 Main Shoulder Joints?
What type of joint are they?

Answer 13

Glenohumeral Joint: Ball-and-socket joint
Acromioclavicular Joint (AC Joint): Plane joint
Sternoclavicular Joint (SC Joint): Saddle joint.