Life

What plane of motion does the acromioclavicular joint move in?

What plane of motion does the acromioclavicular joint move in?

The acromioclavicular joint is a diarthrodial joint defined by the lateral clavicle articulating with the acromion process as it projects anteriorly off the scapula. The AC joint is a plane type synovial joint, which under normal physiological conditions allows only gliding movement.

Which bone articulations make the SC and AC joints?

The SC and AC joints are interdependent with the ST joint because the scapula is attached by its acromion process to the lateral end of the clavicle & through the AC joint; the clavicle, in turn, is attached to the axial skeleton at the manubrium of the sternum through the SC joint.

Are the conoid and trapezoid ligaments part of the AC joint?

The coracoclavicular ligament extends between the acromial end of clavicle and coracoid process of scapula. It consists of both trapezoid and conoid parts.

What is Conoid ligament?

The conoid ligament takes the shape of an inverted cone. It is the posteromedial part of the coracoclavicular ligament. Its apex originates from the knuckle of the coracoid process on the scapula. It has a wide attachment around the conoid tubercle on the inferior surface of the clavicle.

What muscle upwardly rotates the scapula?

serratus anterior muscles
The middle and lower serratus anterior muscles produce scapular upward rotation, posterior tilting, and external rotation. Upper trapezius produces clavicular elevation and retraction. The middle trapezius is primarily a medial stabilizer of the scapula.

Is the acromioclavicular joint stable?

Several biomechanical studies showed that horizontal stability of the AC joint is mediated by the AC ligaments while vertical stability is mediated by the CC ligaments.

What muscles attach at AC joint?

The deltoid, trapezius and pectoralis major also have important attachments to the clavicle. The deltoid inserts into the anterior surface of the lateral third of the clavicle, and the trapezius inserts into its posterior aspect. The pectoralis major inserts into the anterior surface of the medial two thirds (2).

What bones make up the SC joint?

The sternoclavicular (SC) joint is the linkage between the clavicle (collarbone) and the sternum (breastbone).

What muscles attaches to the conoid tubercle?

trapezius muscle.

  • latissimus dorsi muscle.
  • levator scapulae muscle.
  • rhomboid minor muscle.
  • rhomboid major muscle.
  • pectoralis major muscle.
  • pectoralis minor muscle.
  • serratus anterior muscle.
  • Is the conoid tubercle superior?

    The conoid ligament attaches to the clavicle at the conoid tubercle, which is posterior medial to the trapezoid tubercle. From superior to inferior, the conoid ligament appears as an inferior pointing cone.