What are the 4 bones that make up the shoulder joint complex?

What are the 4 bones that make up the shoulder joint complex?

We have potentially four bones that could be considered part of the shoulder girdle or shoulder complex:

  • The humerus = the upper arm bone.
  • The scapula = the shoulder blade.
  • The clavicle = the collarbone.
  • The sternum = the breastbone.

Which bones form the shoulder joint quizlet?

Shoulder joint: Bones and ligaments

  • Scapula.
  • Humerus.
  • Clavicle.

Which three bones comprise the shoulder joint quizlet?

The bones that comprise the shoulder complex and shoulder joint are the clavicle, scapula, and humerus. These three bones form the four major articulations associated with the shoulder complex: the sternoclavicular joint, the acromioclavicular joint, the glenohumeral joint, and the scapulothoracic joint.

What is shoulder joint?

The shoulder is one of the largest and most complex joints in the body. The shoulder joint is formed where the humerus (upper arm bone) fits into the scapula (shoulder blade), like a ball and socket. Other important bones in the shoulder include: The acromion is a bony projection off the scapula.

What type of joint is the shoulder joint?

ball-and-socket synovial joint
The glenohumeral joint is the main articulation of the shoulder joint. It is the multiaxial ball-and-socket synovial joint formed by the articular surfaces of the glenoid cavity and the head of the humerus. The glenoid cavity depth is increased by a rim of fibrocartilage that surrounds it.

What are the 3 main muscles in your shoulders?

The large shoulder muscles are responsible for most of the shoulder’s work.

  • Trapezius is responsible for elevating the shoulder blade and rotating it during arm abduction.
  • Deltoid is responsible for flexion and medial rotation of the arm.
  • Pectoralis major is responsible for arm adduction and medial rotation of the arm.

How a bone is formed Class 6?

The process of hardening cartilage into bone is called ossification. Osteoblasts secrete the osteoid into this membrane to form a spongelike network of bony processes called trabeculae.

What are some bones?

The skeleton Spine – cervical, thoracic and lumbar vertebrae, sacrum and tailbone (coccyx) Chest – ribs and breastbone (sternum) Arms – shoulder blade (scapula), collar bone (clavicle), humerus, radius and ulna. Hands – wrist bones (carpals), metacarpals and phalanges. Pelvis – hip bones.

Which joint is formed where the humerus and scapula meet quizlet?

The main shoulder joint, called the glenohumeral joint, is formed where the ball of the humerus fits into a shallow socket on the scapula. This shallow socket is called the glenoid. The acromioclavicular (AC) joint is where the clavicle meets the acromion.

What are the three major articulations of the shoulder quizlet?

Joints of the Shoulder Complex

  • Glenhumeral joint.
  • Acromioclavicular joint.
  • Sternvoclavicula joint.
  • Scapulothoracic joint.

How many bones are in the shoulder girdle?

The shoulder girdle consists of three bones (clavicle, scapula, and humerus) and three joints (sternoclavicular, acromioclavicular, and glenohumeral) as shown in Fig. 16.2.

What bone is the scapula?

The scapula is a flat, triangular-shaped bone (colloquially as the “shoulder blade”). It is located in the upper thoracic region on the dorsal surface of the rib cage. It connects with the humerus at the glenohumeral joint as well as the clavicle at the acromioclavicular joint to form the shoulder joint.

How bone is formed?

There are two major modes of bone formation, or osteogenesis, and both involve the transformation of a preexisting mesenchymal tissue into bone tissue. The direct conversion of mesenchymal tissue into bone is called intramembranous ossification. This process occurs primarily in the bones of the skull.