Scapula and Clavicle Features

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Questions and Answers

What is the function of the pectoral girdle?

The pectoral girdle articulates with the trunk and supports the upper limbs.

What is the common name for the clavicle?

Collarbone

What is the name of the joint formed by the articulation of the clavicle with the manubrium of the sternum?

Sternoclavicular joint

What is the name of the tubercle located on the inferior surface of the clavicle, near the acromial end?

Conoid tubercle Signup and view all the answers

What is the name of the ligament that attaches to the costal tuberosity of the clavicle?

Costoclavicular ligament Signup and view all the answers

What is the shape of the sternal end of the clavicle?

Roughly pyramidal Signup and view all the answers

What is the name of the joint formed by the articulation of the clavicle with the acromion of the scapula?

Acromioclavicular joint Signup and view all the answers

What is the surface characteristic of the superior surface of the clavicle?

Relatively smooth Signup and view all the answers

What is the bony tip of the shoulder formed by, and what articulates with it?

The bony tip of the shoulder is formed by the acromion, and it articulates with the acromial end of the clavicle. Signup and view all the answers

What is the function of the coracoid process of the scapula?

The coracoid process is a site for muscle attachment. Signup and view all the answers

What are the three borders of the scapula, and what are they adjacent to?

The three borders of the scapula are the superior border (adjacent to the spine of the scapula), the medial border (adjacent to the vertebrae), and the lateral border (adjacent to the axilla). Signup and view all the answers

What is the function of the suprascapular notch (or foramen) in the scapula?

The suprascapular notch (or foramen) provides passage for the suprascapular nerve and blood vessels. Signup and view all the answers

What is the glenoid cavity, and what does it articulate with?

The glenoid cavity is a cup-shaped fossa on the lateral angle of the scapula, and it articulates with the humerus (the bone of the arm). Signup and view all the answers

What are the two shallow fossae on the posterior surface of the scapula, and what muscles occupy them?

The two shallow fossae on the posterior surface of the scapula are the supraspinous fossa (occupied by the supraspinatus muscle) and the infraspinous fossa (occupied by the infraspinatus muscle). Signup and view all the answers

What is the subscapular fossa, and what muscle overlies it?

The subscapular fossa is a broad, relatively smooth surface on the anterior aspect of the scapula, and it is overlain by the subscapularis muscle. Signup and view all the answers

What is the orientation of the superior border of the scapula?

The superior border of the scapula is horizontal. Signup and view all the answers

Study Notes

The Pectoral Girdle and Its Functions

The pectoral girdle articulates with the trunk and supports the upper limbs.
It consists of the clavicles and the scapulae.

Clavicle

The clavicle is an elongated, S-shaped bone that extends between the manubrium of the sternum and the acromion of the scapula.
Its sternal end (medial end) is roughly pyramidal in shape and articulates with the manubrium of the sternum, forming the sternoclavicular joint.
The acromial end (lateral end) of the clavicle is broad and flattened and articulates with the acromion of the scapula, forming the acromioclavicular joint.
The superior surface of the clavicle is relatively smooth, and the inferior surface is roughened.
The conoid tubercle, located on the inferior surface near the acromial end, is the attachment site for the conoid ligament.
The costal tuberosity, located on the inferior surface at the sternal end, is the attachment site for the costoclavicular ligament.

Scapula

The scapula is a broad, flat, triangular bone that forms the shoulder blade.
The spine of the scapula is a ridge of bone on the posterior aspect of the scapula.
The acromion is a larger, flattened, posterior process that forms the bony tip of the shoulder and articulates with the acromial end of the clavicle.
The coracoid process is a smaller, more anterior, hook-shaped projection that is a site for muscle attachment.
The triangular shape of the scapula forms three borders: superior, medial, and lateral.
The superior border has a suprascapular notch (or foramen) that provides passage for the suprascapular nerve and blood vessels.
The angles of the scapula include the superior angle, inferior angle, and lateral angle.
The lateral angle is primarily made up of the glenoid cavity, which articulates with the humerus.
The subscapular fossa is the broad, relatively smooth anterior surface of the scapula.
The spine subdivides the posterior surface of the scapula into two shallow fossae: the supraspinous fossa and the infraspinous fossa.

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Description

Learn about the scapula and clavicle bones, their features, and how to identify them. Understand the differences between the sternal and acromial ends of the clavicle.