Humerus and Scapula Anatomy Quiz

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Questions and Answers

What are the two primary bones that articulate to form the shoulder joint?

Humerus and ulna

Scapula and clavicle

Humerus and scapula (correct)

Clavicle and radius

What is another name for the shoulder joint?

Glenohumeral joint (correct)

Humeroscapular joint

Acromioclavicular joint

Subacromial joint

What characteristic makes the shoulder joint highly mobile?

The presence of ligaments

The length of the humerus

The shallow glenoid cavity (correct)

The type of cartilage present

What is the shape of the head of the humerus?

Dome-shaped Signup and view all the answers

What structure is located between the greater and lesser tubercles of the humerus?

Intertubercular sulcus Signup and view all the answers

Which of the following statements is true about the shoulder joint?

It is one of the most mobile joints. Signup and view all the answers

What is the smaller prominence located medially to the head of the humerus called?

Lesser tubercle Signup and view all the answers

What is the anatomical term for the long bone of the arm?

Humerus Signup and view all the answers

What is the location of the anatomical neck of the humerus in relation to the tubercles?

Proximal to the tubercles Signup and view all the answers

Why is the surgical neck of the humerus named as such?

It is where the humerus is most often fractured. Signup and view all the answers

What structure is located at the lateral side of the anterior aspect of the distal end of the humerus?

Radial fossa Signup and view all the answers

Which part of the humerus articulates with the head of the radius?

Capitulum Signup and view all the answers

What is the medial epicondyle of the humerus primarily known for?

Providing attachment for forearm flexor muscles Signup and view all the answers

What is the purpose of the deltoid tuberosity on the humerus?

It serves as a muscle attachment point for the deltoid muscle. Signup and view all the answers

What is the shape of the trochlea, and what does this imply about its function?

Pulley-like; it permits smooth articulation with the ulna. Signup and view all the answers

What surfaces divide the anterior aspect of the shaft of the humerus?

Anteromedial and anterolateral surfaces Signup and view all the answers

Study Notes

Humerus and Scapula Bones of the Shoulder Joint

The humerus (long bone of the arm) and scapula (shoulder blade) articulate to form the shoulder joint (glenohumeral joint).
The shoulder joint is highly mobile but also unstable, prone to dislocation.
The head of the humerus is dome-shaped and articulates with the glenoid cavity of the scapula.

Humerus Anatomy (Anterior View)

Head: Dome-shaped, angled from the shaft, articulates with the glenoid cavity.
Greater Tubercle: Prominence lateral to the head, forms a crest.
Lesser Tubercle: Smaller prominence medial to the head, forms a crest.
Intertubercular Sulcus (Bicipital Groove): Groove between the tubercles, houses the proximal tendon of the biceps brachii muscle.
Anatomical Neck: Ring-like structure around the humeral head, proximal to tubercles.
Surgical Neck: Narrow region distal to the tubercles, fracture-prone.
Shaft (Body): The main portion of the bone. Anterior surface can be divided into anteromedial and anterolateral portions from the crest of the greater tubercle to the distal end.
Deltoid Tuberosity: Roughened prominence on the lateral midshaft, where the deltoid muscle attaches.
Radial Fossa: Depression on the lateral aspect of the distal end, accommodates the head of the radius.
Coronoid Fossa: Depression on the medial aspect of the distal end, accommodates the coronoid process of the ulna.
Capitulum: Landmark that articulates with the head of the radius.
Trochlea: Landmark that articulates with the ulna. Its shape resembles a pulley.
Medial Epicondyle: Prominent expansion on the medial aspect of the distal end, attachment for anterior (flexor) forearm muscles.

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Description

Test your knowledge about the humerus and scapula anatomy, focusing on their structures and the formation of the shoulder joint. This quiz covers key features like the head, tubercles, and the anatomical and surgical necks of the humerus. Understand the functional aspects of the shoulder joint's mobility and stability.