Human Anatomy - Clavicle and Joint Capsule

Questions and Answers

What is the role of the AC joint in the shoulder?

It stabilizes the humerus during rotation.

It connects the scapula to the clavicle. (correct)

It facilitates elbow movement.

It absorbs shock during arm elevation.

Which of the following structures does NOT contribute to shoulder flexion?

Clavicle

Scapula

Humerus

Femur (correct)

What is a potential consequence of a weak serratus anterior?

Decreased risk of shoulder injuries.

Increased range of shoulder abduction.

Enhanced shoulder stability.

Winging of the scapula. (correct)

How is the shoulder joint capsule described in terms of its composition?

Thin and flexible. Signup and view all the answers

What position corresponds to shoulder flexion?

Arm raised frontwards. Signup and view all the answers

What is the function of the coracoid process in the shoulder complex?

Attachment site for shoulder ligaments. Signup and view all the answers

Which of the following best describes subacromial space?

It contains the rotator cuff tendons. Signup and view all the answers

Which motion is facilitated by the external rotation of the shoulder?

Reaching the hand behind the back. Signup and view all the answers

Study Notes

Clavicle and Shoulder Anatomy

Clavicle connects the arm to the body and is crucial for shoulder movement.
AC joint (Acromioclavicular joint) plays an essential role in shoulder mechanics.
The joint capsule is thin and flexible, allowing for a wider range of motion.
Subluxation of the humerus can occur, indicating a partial dislocation.

Shoulder Movements

Shoulder flexion range is from 90° to 180°.
Key muscles involved include the serratus anterior, which stabilizes the scapula and prevents winging.
The coracoid process acts as an attachment point for muscles and ligaments around the shoulder.

Key Shoulder Spaces

Subacromial space is crucial for shoulder function, ensuring smooth movement between bones.
Involvement of the ribs (3-5) indicates the connection between the shoulder girdle and upper body stability.

Importance of Mobility

Internal rotation and elevation of the shoulder are vital for various movements.
Weakness in the serratus anterior can lead to scapular winging and compromised shoulder function.

Description

This quiz focuses on the anatomy of the clavicle and the surrounding joint capsule. Questions will cover details of the acromioclavicular joint and its ligamentous attachments. Test your knowledge and understanding of these essential anatomical structures.